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监理 - 2009/6/27 9:29:00

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王跟民2
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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。Û¶PÃ'⟯dbbs.3c3t.com1¤(qx_œ{j
[关键词]隧道  横净距  视距半径  加宽Û¶PÃ'⟯dbbs.3c3t.com1¤(qx_œ{j
1、视距影响因素及隧道建筑限界Û¶PÃ'⟯dbbs.3c3t.com1¤(qx_œ{j
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2Û¶PÃ'⟯dbbs.3c3t.com1¤(qx_œ{j

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车道宽度WÛ¶PÃ'⟯dbbs.3c3t.com1¤(qx_œ{j

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侧向宽度LÛ¶PÃ'⟯dbbs.3c3t.com1¤(qx_œ{j

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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。Û¶PÃ'⟯dbbs.3c3t.com1¤(qx_œ{j
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8、结语Û¶PÃ'⟯dbbs.3c3t.com1¤(qx_œ{j
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。Û¶PÃ'⟯dbbs.3c3t.com1¤(qx_œ{j
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。Û¶PÃ'⟯dbbs.3c3t.com1¤(qx_œ{j
参考文献Û¶PÃ'⟯dbbs.3c3t.com1¤(qx_œ{j
[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.Û¶PÃ'⟯dbbs.3c3t.com1¤(qx_œ{j
[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.Û¶PÃ'⟯dbbs.3c3t.com1¤(qx_œ{j
[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.Û¶PÃ'⟯dbbs.3c3t.com1¤(qx_œ{j
[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.Û¶PÃ'⟯dbbs.3c3t.com1¤(qx_œ{j
[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.Û¶PÃ'⟯dbbs.3c3t.com1¤(qx_œ{j
作者简介Û¶PÃ'⟯dbbs.3c3t.com1¤(qx_œ{j
1、Û¶PÃ'⟯dbbs.3c3t.com1¤(qx_œ{j
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)88423020Û¶PÃ'⟯dbbs.3c3t.com1¤(qx_œ{j
2、Û¶PÃ'⟯dbbs.3c3t.com1¤(qx_œ{j
王跟民:陕西省林业勘察设计院公路分院,工程师。Û¶PÃ'⟯dbbs.3c3t.com1¤(qx_œ{j
1
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