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[文章] 浅议水利工程混凝土坝基地质 [复制链接]

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浅议水利工程混凝土坝基地质
                                                                                                                                                                                                                                        
                                                                                                                                           发布时间:                                                                                                                        2007-9-19 8:58:05    浏览次数:                                                                                                                                47
                                                                                                                        
        ™rå‡2~ú«€bbs.3c3t.com“””_m¡‘g
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风化程度全风化强风化弱风化微风化新鲜
岩石风化程度系数<0.20.2~0.40.4~0.750.75~0.90>0.9
3.根据点荷载强度指标划分风化带岩石点荷载试验适用于各类岩石,试验时将岩石试样置于两个球端园台之间,利用球端园台状加荷器施加点荷载,直至试件破坏。记录和量测试样破坏时的极限压力P(N)和加荷点间距离D(cm),计算点荷载强度IS(MPa):™rå‡2~ú«€bbs.3c3t.com“””_m¡‘g
™rå‡2~ú«€bbs.3c3t.com“””_m¡‘g
P™rå‡2~ú«€bbs.3c3t.com“””_m¡‘g
IS=™rå‡2~ú«€bbs.3c3t.com“””_m¡‘g
D2(5.3.1-2)™rå‡2~ú«€bbs.3c3t.com“””_m¡‘g
  式中IS为未经修正的岩石点荷载强度(MPa)。并求出相当于标准直径50mm时点荷载强度IS(50)。换算方法参见GB/T50266-99《工程岩体试验方法标准》(国标)及GB50218-94《工程岩体分级标准》(国标)。本法测定风化岩石强度,并用来划分岩体风化分带,简捷、经济,可直接在现场或室内进行,值得推广应用。现将一些研究者根据点荷载强度划分岩体风化带标准,见表5.3.1-5。™rå‡2~ú«€bbs.3c3t.com“””_m¡‘g
表5.3.1-5 据点荷载强度指标划分岩体风化带的界限值(据陆兆溱2001.10)™rå‡2~ú«€bbs.3c3t.com“””_m¡‘g
研究者岩石名称指标名称岩体风化程度
全风化强风化弱(中)风化微风化新鲜
T.Y.伊凡花岗岩IS(MPa)<0.10.1~44~66~10>10
崔冠英花岗岩点荷载抗拉强度(MPa)<1.01.0~5.05.0~8.08.0~10>10
陆兆溱等混合花岗岩,混合花岗片麻岩IS(50)(MPa)<1.01~55~88~12>12
水电部华东院闽浙花岗岩IS(MPa)<1.01~55~99~11>11
三峡工程闪云斜长花岗岩IS(MPa)™rå‡2~ú«€bbs.3c3t.com“””_m¡‘g
<1弱上1~3弱下3~77~9>9
胡敏慧结晶片岩片理IS(MPa)0.080.4~2.04.1~6.07.2
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 4.根据波速比和标准贯入试验击数划分风化带波速比即波速衰减系数,表达式为™rå‡2~ú«€bbs.3c3t.com“””_m¡‘g
™rå‡2~ú«€bbs.3c3t.com“””_m¡‘g
Vpw™rå‡2~ú«€bbs.3c3t.com“””_m¡‘g
KV=™rå‡2~ú«€bbs.3c3t.com“””_m¡‘g
Vpf(5.3.1-3) ™rå‡2~ú«€bbs.3c3t.com“””_m¡‘g
  式中:Vpw、Vpf分别为风化岩体和新鲜岩体纵波速度(m/s),KV为波速比。《岩土工程勘察规范》《水利水电工程地质勘察规范》中应用波速比KV和风化系数Kf给定各风化分带的特征值,见表5.3.1-6。对花岗岩类岩体,可用标准贯入试验击数N63.5划分残积土和全、强风化带。见表5.3.1-6。™rå‡2~ú«€bbs.3c3t.com“””_m¡‘g
表5.3.1-6 岩石按风化程度分类标准™rå‡2~ú«€bbs.3c3t.com“””_m¡‘g
岩石™rå‡2~ú«€bbs.3c3t.com“””_m¡‘g
类别™rå‡2~ú«€bbs.3c3t.com“””_m¡‘g
风化程度™rå‡2~ú«€bbs.3c3t.com“””_m¡‘g
风化程度划分参数™rå‡2~ú«€bbs.3c3t.com“””_m¡‘g
压缩波速度υp™rå‡2~ú«€bbs.3c3t.com“””_m¡‘g
(m/s)™rå‡2~ú«€bbs.3c3t.com“””_m¡‘g
波速比™rå‡2~ú«€bbs.3c3t.com“””_m¡‘g
Kv™rå‡2~ú«€bbs.3c3t.com“””_m¡‘g
风化系数™rå‡2~ú«€bbs.3c3t.com“””_m¡‘g
Kf™rå‡2~ú«€bbs.3c3t.com“””_m¡‘g
标贯击数™rå‡2~ú«€bbs.3c3t.com“””_m¡‘g
N63.5™rå‡2~ú«€bbs.3c3t.com“””_m¡‘g
点荷载强度Is(50)(MPa)™rå‡2~ú«€bbs.3c3t.com“””_m¡‘g
动弹模Ed™rå‡2~ú«€bbs.3c3t.com“””_m¡‘g
(×103MPa)™rå‡2~ú«€bbs.3c3t.com“””_m¡‘g
硬质™rå‡2~ú«€bbs.3c3t.com“””_m¡‘g
岩石™rå‡2~ú«€bbs.3c3t.com“””_m¡‘g
新鲜(未风化)™rå‡2~ú«€bbs.3c3t.com“””_m¡‘g
>5000™rå‡2~ú«€bbs.3c3t.com“””_m¡‘g
0.9~1.0™rå‡2~ú«€bbs.3c3t.com“””_m¡‘g
0.9~1.0™rå‡2~ú«€bbs.3c3t.com“””_m¡‘g
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>12™rå‡2~ú«€bbs.3c3t.com“””_m¡‘g
>36™rå‡2~ú«€bbs.3c3t.com“””_m¡‘g
微风化™rå‡2~ú«€bbs.3c3t.com“””_m¡‘g
4000~5000™rå‡2~ú«€bbs.3c3t.com“””_m¡‘g
0.8~0.9™rå‡2~ú«€bbs.3c3t.com“””_m¡‘g
0.8~0.9™rå‡2~ú«€bbs.3c3t.com“””_m¡‘g
-™rå‡2~ú«€bbs.3c3t.com“””_m¡‘g
8~12™rå‡2~ú«€bbs.3c3t.com“””_m¡‘g
18~36™rå‡2~ú«€bbs.3c3t.com“””_m¡‘g
中等风化™rå‡2~ú«€bbs.3c3t.com“””_m¡‘g
2000~4000™rå‡2~ú«€bbs.3c3t.com“””_m¡‘g
0.6~0.8™rå‡2~ú«€bbs.3c3t.com“””_m¡‘g
0.4~0.8™rå‡2~ú«€bbs.3c3t.com“””_m¡‘g
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5~8™rå‡2~ú«€bbs.3c3t.com“””_m¡‘g
8~18™rå‡2~ú«€bbs.3c3t.com“””_m¡‘g
强风化™rå‡2~ú«€bbs.3c3t.com“””_m¡‘g
1000~2000™rå‡2~ú«€bbs.3c3t.com“””_m¡‘g
0.4~0.6™rå‡2~ú«€bbs.3c3t.com“””_m¡‘g
<0.4™rå‡2~ú«€bbs.3c3t.com“””_m¡‘g
≥50™rå‡2~ú«€bbs.3c3t.com“””_m¡‘g
1~5™rå‡2~ú«€bbs.3c3t.com“””_m¡‘g
2~8™rå‡2~ú«€bbs.3c3t.com“””_m¡‘g
全风化™rå‡2~ú«€bbs.3c3t.com“””_m¡‘g
500~1000™rå‡2~ú«€bbs.3c3t.com“””_m¡‘g
0.2~0.4™rå‡2~ú«€bbs.3c3t.com“””_m¡‘g
-™rå‡2~ú«€bbs.3c3t.com“””_m¡‘g
50>N≥30™rå‡2~ú«€bbs.3c3t.com“””_m¡‘g
<1™rå‡2~ú«€bbs.3c3t.com“””_m¡‘g
<2™rå‡2~ú«€bbs.3c3t.com“””_m¡‘g
残积土™rå‡2~ú«€bbs.3c3t.com“””_m¡‘g
<500™rå‡2~ú«€bbs.3c3t.com“””_m¡‘g
<0.2™rå‡2~ú«€bbs.3c3t.com“””_m¡‘g
-™rå‡2~ú«€bbs.3c3t.com“””_m¡‘g
<30™rå‡2~ú«€bbs.3c3t.com“””_m¡‘g
™rå‡2~ú«€bbs.3c3t.com“””_m¡‘g
™rå‡2~ú«€bbs.3c3t.com“””_m¡‘g
软质岩石™rå‡2~ú«€bbs.3c3t.com“””_m¡‘g
新鲜(未风化)™rå‡2~ú«€bbs.3c3t.com“””_m¡‘g
>4000™rå‡2~ú«€bbs.3c3t.com“””_m¡‘g
0.9~1.0™rå‡2~ú«€bbs.3c3t.com“””_m¡‘g
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微风化™rå‡2~ú«€bbs.3c3t.com“””_m¡‘g
3000~4000™rå‡2~ú«€bbs.3c3t.com“””_m¡‘g
0.8~0.9™rå‡2~ú«€bbs.3c3t.com“””_m¡‘g
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中等风化™rå‡2~ú«€bbs.3c3t.com“””_m¡‘g
1500~3000™rå‡2~ú«€bbs.3c3t.com“””_m¡‘g
0.5~0.8™rå‡2~ú«€bbs.3c3t.com“””_m¡‘g
0.3~0.8™rå‡2~ú«€bbs.3c3t.com“””_m¡‘g
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强风化™rå‡2~ú«€bbs.3c3t.com“””_m¡‘g
700~1500™rå‡2~ú«€bbs.3c3t.com“””_m¡‘g
0.3~0.5™rå‡2~ú«€bbs.3c3t.com“””_m¡‘g
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全风化™rå‡2~ú«€bbs.3c3t.com“””_m¡‘g
300~700™rå‡2~ú«€bbs.3c3t.com“””_m¡‘g
0.1~0.3™rå‡2~ú«€bbs.3c3t.com“””_m¡‘g
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