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[文章] 公路隧道视距曲线半径的探讨 [复制链接]

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  ¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA
韩熠1¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA
王跟民2
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( 1.陕西交通技术咨询有限公司,陕西 西安 710068;¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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2.陕西省林业勘察设计院,陕西西安 710082;)¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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[摘  要]本文概略分析了影响隧道视距的因素,计算了隧道横净距,建立了隧道视距曲线半径的概念,提出了隧道线形设计和改善交通安全的建议。¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA
[关键词]隧道  横净距  视距半径  加宽¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA
1、视距影响因素及隧道建筑限界¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA
公路隧道几何设计、车辆几何尺寸、驾驶员、照明及自然环境、交通组成等因素,均影响隧道视距,几何设计主要包括隧道建筑限界、内轮廓、平纵线形、路拱等。为便于讨论,依据《公路工程技术标准》(JTG B01-2003)、《公路隧道设计规范》(JTG D70-2004)和《公路项目安全性评价指南》(JTG B05-2004)(分别简称《标准》、《规范》、《指南》),限定相关边界。高速公路和一级公路隧道建筑限界及横断面组成尺寸见表1,二级以下公路隧道建筑限界及横断面组成尺寸见表2¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

表1¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA
¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA
高速、一级公路隧道建筑限界横断面组成一览表(单位:米)¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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序号¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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设计速度(km/h)¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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车道宽度W¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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侧向宽度L¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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最小检修道J¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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建筑限界净空¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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120¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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3.75×2¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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0.75 ¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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1.25 ¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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0.75 ¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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0.75 ¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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11.00 ¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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5.00 ¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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2¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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100¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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1.00 ¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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0.75 ¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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0.75 ¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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10.50 ¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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3¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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0.50 ¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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0.75 ¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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0.75 ¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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0.75 ¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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10.25 ¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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5.00 ¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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4¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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60¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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0.75 ¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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0.75 ¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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9.75 ¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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5.00 ¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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表2¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA
二级以下等级公路隧道建筑限界横断面组成一览表(单位:米)¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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序号¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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设计速度(km/h)¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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车道宽度W¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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侧向宽度L¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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最小人行道J¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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0.75 ¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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10.50 ¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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5.00 ¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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2¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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60二级¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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9.50 ¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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3¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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0.75 ¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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9.00 ¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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4¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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0.75 ¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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9.00 ¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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4.50 ¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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5¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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二级公路设计速度为8060公里/小时,隧道内人行道(兼检修道)最小宽度为1.0,净宽分别为1110,大于《标准》中最小规定值,本文采用《规范》规定值;四级公路,隧道建筑限界净宽为7.0,小于《标准》规定最小值,本文采用《标准》7.5的建筑限界。¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA
2、标准车型与视距¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA
计算车型分别选择小客车和货车,小客车宽度B1.8,货车宽度B2.5,驾驶员位于车辆左侧0.5处。前方障碍物高均为0.1。停车视距以小客车为标准,目高为1.2,自驾驶员发现障碍物起,至车辆在障碍物前安全停止,所需的最短行车距离即为小客车停车视距,简称停车视距。计算货车停车视距时,驾驶员目高为2.0。若运行速度大小与设计速度相等,依据《标准》和《指南》规定,停车视距和货车停车视距规定见表3和表4所示。¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

表3¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA
¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA
¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA
¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA
高速、一级公路停车视距及货车停车视距(单位:米)¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

序号¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

设计速度¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

标准停车视距¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

指南停车视距¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

标准货车¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

停车视距¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

指南货车¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

停车视距¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

《标准》修正停车货车视距¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

3¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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4¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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5%¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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6%¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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7¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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8¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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9¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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1¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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120¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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210¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

280¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

245¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

417¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

265¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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273¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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--¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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--¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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2¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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100¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

160¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

205¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

180¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

301¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

190¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

195¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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200¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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--¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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3¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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80¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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110¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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140¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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125¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

202¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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130¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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132¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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136¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

139¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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4¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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60¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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75¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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90¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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85¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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120¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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89¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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91¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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93¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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95¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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表4¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA
¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA
二、三、四级公路停车视距及货车停车视距(单位:米)
¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

序号¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

设计速度¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

标准停车视距¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

指南停车视距¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

标准货车¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

停车视距¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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指南货车¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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停车视距¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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《标准》下坡修正停车货车视距¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

3¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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4¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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5%¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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6%¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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7¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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8¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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9¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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1¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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80¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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110¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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140¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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125¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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202¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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130¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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132¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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136¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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139¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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2¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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60¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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75¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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90¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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85¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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120¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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89¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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91¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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93¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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95¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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3¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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40¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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40¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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50¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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50¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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50¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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4¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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《指南》修正了货车停车视距,纵坡大于2%,半径小于400路段,应核查修正。上坡路段可以减小货车停车视距,下坡路段必须增大货车停车视距。¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA
3、公路隧道横净距¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA
当检修道(人行道,下同)高度大于0.1,或检修道高度影响视线时,横净距(m1)应计算到检修道边缘;当隧道内壁布设有关设施影响视线时,横净距(m2)应计算至建筑限界边缘处;当隧道内壁未布设隧道设施或不影响视线时,横净距(m3)可计算至隧道内轮廓处。无论车辆在那个车道行驶,均假定车辆行驶轨迹与车道中心线重合,并假定视高处建筑限界至内轮廓距离为0.25。依行驶方向为准,左转弯曲线隧道应计算左车道横净距,右转弯曲线应计算右车道横净距。¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA
左车道横净距m(W/2B)/20.5L[J0.25]¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA
………………………3-1¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA
右车道横净距m(W/2B)/20.5L[J0.25]¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA
………………………3-2¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA
隧道提供的最大横净距计算结果见表5。左侧车道横净距小于右侧车道横净距,左转弯曲线隧道较右转弯曲线隧道不利于安全;左转弯隧道,为小客车提供的横净距大于为货车提供的横净距;右转弯曲线隧道,为小客车提供的横净距小于为货车提供的横净距。¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA
表5¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA
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公路隧道提供的最大横净距(单位:m)
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2.975 ¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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1.850 ¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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1.500 ¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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2.650 ¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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3.000 ¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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2.850 ¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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2.500 ¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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3.650 ¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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4.000 ¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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3.100 ¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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2.750 ¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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3.900 ¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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4.250 ¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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40¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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1.600 ¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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1.250 ¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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2.400 ¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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2.750 ¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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2.350 ¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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2.000 ¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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3.150 ¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

3.500 ¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

2.600 ¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

2.250 ¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

3.400 ¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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3.750 ¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

40¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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1.600 ¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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1.250 ¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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2.400 ¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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2.750 ¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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2.350 ¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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2.000 ¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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3.150 ¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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3.500 ¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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2.600 ¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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2.250 ¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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3.400 ¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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3.750 ¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

30¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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1.475 ¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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1.125 ¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

2.275 ¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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2.625 ¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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1.725 ¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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1.375 ¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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2.525 ¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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2.875 ¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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1.975 ¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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1.625 ¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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2.775 ¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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3.125 ¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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20¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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1.600 ¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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1.250 ¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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2.400 ¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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2.750 ¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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1.850 ¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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1.500 ¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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2.650 ¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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3.000 ¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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2.100 ¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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1.750 ¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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2.900 ¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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3.250 ¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

4、隧道视距平曲线半径¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA
假定曲线隧道位于同一曲率半径的圆曲线上,曲率半径与视距、横净距的关系式为:¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA
 ……………………………4-1¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA
式中: —实际横净距,米;¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA
      —计算车道中线处的曲线半径,米;¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA
—(货车)停车视距,米。¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA
依据cosα=1-α2/2!+α4/4!-……+(-1)nα2n/(2n)!,由公式4-1推导简化公式得4-2,可直接计算平曲线半径。两公式计算很相近,后者比前者一般大0.30.5,误差可以忽略。¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA
………………………………………4-2¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA
隧道提供横净距越小,要求平曲线半径越大,比照路线规范,视距采用《标准》规定视距,可将检修道(m1)对应的曲率半径R1定义为隧道安全视距半径,将建筑限界(m2)对应曲率半径R2定义为隧道一般视距半径,将隧道内轮廓(m3)对应的曲率半径R3定义为隧道最小视距半径。¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA
高速公路、一级公路为分离式单向行驶,只需考虑制动停车视距。双向行驶的二、三、四级公路,隧道路段一般禁止超车,也只考虑停车视距。表6显示货车视距半径一般大于小客车视距半径,拟定隧道曲线半径时,应采用货车视距曲线半径,但应区分左、右转弯曲线。同时考虑《指南》视距要求,确定隧道线形时,应参照表7拟定平面参数。¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

表6¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA
¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA
公路隧道视距平曲线半径计算值(单位:米)
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设计速度¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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安全视距半径R1¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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一般视距半径R2¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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最小视距半径R3¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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左侧车道¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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右侧车道¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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左侧车道¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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右侧车道¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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左侧车道¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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右侧车道¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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小车¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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货车¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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小车¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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货车¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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小车¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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货车¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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小车¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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货车¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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小车¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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货车¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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小车¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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货车¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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120¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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2478¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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4002¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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1564¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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1936¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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1853¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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2858¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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1289¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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1622¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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1709¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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2610¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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1218¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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1539¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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100¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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1620¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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926¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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80¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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766¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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1202¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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500¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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579¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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555¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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822¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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401¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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公路隧道视距平曲线半径建议值(单位:m)
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5、隧道断面加宽¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA
隧道平曲线半径小于最小视距半径R3时,应采取措施加大隧道横净距。若线形改善困难时,应加大隧道断面尺寸或调整断面布设。若按《规范》设置了超高值不大于4%的平曲线,右转弯隧道横净距均满足视距要求,左转弯隧道应加大左侧横净距,加宽参考值见表8所示。表中0.551.65分别为80100公里/小时的最大加宽值。¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA
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曲线隧道横净距加宽参考表 (单位:米)¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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680¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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625¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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620¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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60¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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350¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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6、纵坡路段视距平曲线半径¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA
前面计算的平曲线视距半径,应为路线纵坡小于2%的视距平曲线半径。当行驶方向为上坡时,有助于车辆制动,当行驶方向为下坡时,加大了制动距离。《标准》修正了3%、4%、5%、6%的下坡路段货车停车视距,《指南》修正了2%、4%、6%的上、下坡货车停车视距。暂且只讨论高速公路和一级公路,且线性增加不同坡度修正值,不考虑路线上坡影响。下坡路段货车停车视距修正值见表9所示。依据《标准》和《指南》修正视距计算出的视距半径见表10和表11所示。¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA
9¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA
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纵坡路段货车停车视距修正值(单位:米)¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

设计速度¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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平坡路段¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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2¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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6¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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标准¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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指南¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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标准¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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指南¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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标准¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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标准¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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标准¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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标准¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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指南¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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301¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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26¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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8¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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36¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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《标准》纵坡修正后的视距半径表¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

设计速度(km/h)¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA

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7、竖曲线视距半径¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA
视距为竖曲线上的一段圆弧,视点(眼睛)与障碍物顶部的直线距离,可简称为视线距离,因竖曲线半径一般很大,往往是平曲线的很多倍,可以认为视距与视线距离相等。凸型竖曲线可能成为视线障碍,凹型竖曲线可能成为车灯的障碍,设置照明的隧道可不考虑凹型竖曲线的影响。¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA
设眼睛视点高度为a,障碍物高度为b,经求证竖曲线的视距半径计算公式为6-1。《规范》货车竖曲线视距半径小于小客车半径,小客车视距半径多数大于路线极限最小竖曲线半径,小于路线一般最小半径;但《指南》小客车视距半径小于货车视距半径,货车视距半径大于路线一般最小半径。¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA
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R
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为了便于运用,对于标准车型小客车、货车可分别简化为6-26-3近视计算公式:¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA
¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA
R
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8、结语¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA
综上所述,隧道横净距越小,要求最小平曲线半径越大;单向双车道隧道,左车道横净距小于右车道横净距;依据车辆行驶方向,左转弯隧道的横净距小于右转弯隧道;无论左转或是右转,视距曲线半径均由货车控制。现行规范规定隧道左侧路缘带宽度小于右侧路缘带宽度,适应了驾驶行为,但不利于保证曲线隧道路段的视距要求,应给与关注。隧道曲线半径应尽可能大于R2。当隧道曲线半径大于安全视距半径R1时,可不考虑其它因素对视距的影响;当曲线半径小于安全视距半径R1时,应检查纵坡对视距的影响,并控制检修道高度;当小于R2时,应同时检查隧道内部设施对视距的影响;当小于R3时,应优先考虑加大平曲线半径,或加宽隧道左侧横净距。《指南》加大了视距要求,依据隧道路段驾驶习惯,山区高速公路的中、短隧道可不考虑《指南》提高要求,特长、长隧道曲线半径,宜采用《指南》对应的视距曲线半径。¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA
限于水平,平面线形、平纵组合等因素未讨论,且文中难免有不妥之处,敬请批评指正。¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA
参考文献¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA
[1]中华人民共和国交通部.公路工程技术标准(JTGB01—2003.北京.人民交通出版社.2004.¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA
[2]中华人民共和国交通部.公路隧道设计规范(JTGD70—2004.北京.人民交通出版社.2004.¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA
[3]中华人民共和国交通部.公路项目安全性评价指南(JTG/TB05—2004.北京.人民交通出版社.2005.¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA
[4]中华人民共和国交通部.公路路线设计规范(JTG D20—2006.北京.人民交通出版社.2007.¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA
[5]中华人民共和国交通部.公路路线设计规范(JTJ 011—94.北京.人民交通出版社.1995.¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA
作者简介¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA
1、¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA
熠:工作单位:陕西交通技术咨询有限公司,同济大学道路工程专业,本科,高级工程师,总经理。联系方式:西安市含光北路110号,陕西交通技术咨询有限公司,电话:(029)88423020¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA
2、¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA
王跟民:陕西省林业勘察设计院公路分院,工程师。¸µq&8ÀâÞúbbs.3c3t.com­â³_¬UA
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