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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
                                                                                                                        
        ´~І0Þ¤rÃbbs.3c3t.com’ãzSÞ¾PïX
´~І0Þ¤rÃbbs.3c3t.com’ãzSÞ¾PïX
                                                                                                                        
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):´~І0Þ¤rÃbbs.3c3t.com’ãzSÞ¾PïX
´~І0Þ¤rÃbbs.3c3t.com’ãzSÞ¾PïX
P´~І0Þ¤rÃbbs.3c3t.com’ãzSÞ¾PïX
IS=´~І0Þ¤rÃbbs.3c3t.com’ãzSÞ¾PïX
D2(5.3.1-2)´~І0Þ¤rÃbbs.3c3t.com’ãzSÞ¾PïX
  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。´~І0Þ¤rÃbbs.3c3t.com’ãzSÞ¾PïX
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)´~І0Þ¤rÃbbs.3c3t.com’ãzSÞ¾PïX
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)´~І0Þ¤rÃbbs.3c3t.com’ãzSÞ¾PïX
<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
´~І0Þ¤rÃbbs.3c3t.com’ãzSÞ¾PïX
 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´~І0Þ¤rÃbbs.3c3t.com’ãzSÞ¾PïX
´~І0Þ¤rÃbbs.3c3t.com’ãzSÞ¾PïX
Vpw´~І0Þ¤rÃbbs.3c3t.com’ãzSÞ¾PïX
KV=´~І0Þ¤rÃbbs.3c3t.com’ãzSÞ¾PïX
Vpf(5.3.1-3) ´~І0Þ¤rÃbbs.3c3t.com’ãzSÞ¾PïX
  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。´~І0Þ¤rÃbbs.3c3t.com’ãzSÞ¾PïX
表5.3.1-6 岩石按风化程度分类标准´~І0Þ¤rÃbbs.3c3t.com’ãzSÞ¾PïX
岩石´~І0Þ¤rÃbbs.3c3t.com’ãzSÞ¾PïX
类别´~І0Þ¤rÃbbs.3c3t.com’ãzSÞ¾PïX
风化程度´~І0Þ¤rÃbbs.3c3t.com’ãzSÞ¾PïX
风化程度划分参数´~І0Þ¤rÃbbs.3c3t.com’ãzSÞ¾PïX
压缩波速度υp´~І0Þ¤rÃbbs.3c3t.com’ãzSÞ¾PïX
(m/s)´~І0Þ¤rÃbbs.3c3t.com’ãzSÞ¾PïX
波速比´~І0Þ¤rÃbbs.3c3t.com’ãzSÞ¾PïX
Kv´~І0Þ¤rÃbbs.3c3t.com’ãzSÞ¾PïX
风化系数´~І0Þ¤rÃbbs.3c3t.com’ãzSÞ¾PïX
Kf´~І0Þ¤rÃbbs.3c3t.com’ãzSÞ¾PïX
标贯击数´~І0Þ¤rÃbbs.3c3t.com’ãzSÞ¾PïX
N63.5´~І0Þ¤rÃbbs.3c3t.com’ãzSÞ¾PïX
点荷载强度Is(50)(MPa)´~І0Þ¤rÃbbs.3c3t.com’ãzSÞ¾PïX
动弹模Ed´~І0Þ¤rÃbbs.3c3t.com’ãzSÞ¾PïX
(×103MPa)´~І0Þ¤rÃbbs.3c3t.com’ãzSÞ¾PïX
硬质´~І0Þ¤rÃbbs.3c3t.com’ãzSÞ¾PïX
岩石´~І0Þ¤rÃbbs.3c3t.com’ãzSÞ¾PïX
新鲜(未风化)´~І0Þ¤rÃbbs.3c3t.com’ãzSÞ¾PïX
>5000´~І0Þ¤rÃbbs.3c3t.com’ãzSÞ¾PïX
0.9~1.0´~І0Þ¤rÃbbs.3c3t.com’ãzSÞ¾PïX
0.9~1.0´~І0Þ¤rÃbbs.3c3t.com’ãzSÞ¾PïX
-´~І0Þ¤rÃbbs.3c3t.com’ãzSÞ¾PïX
>12´~І0Þ¤rÃbbs.3c3t.com’ãzSÞ¾PïX
>36´~І0Þ¤rÃbbs.3c3t.com’ãzSÞ¾PïX
微风化´~І0Þ¤rÃbbs.3c3t.com’ãzSÞ¾PïX
4000~5000´~І0Þ¤rÃbbs.3c3t.com’ãzSÞ¾PïX
0.8~0.9´~І0Þ¤rÃbbs.3c3t.com’ãzSÞ¾PïX
0.8~0.9´~І0Þ¤rÃbbs.3c3t.com’ãzSÞ¾PïX
-´~І0Þ¤rÃbbs.3c3t.com’ãzSÞ¾PïX
8~12´~І0Þ¤rÃbbs.3c3t.com’ãzSÞ¾PïX
18~36´~І0Þ¤rÃbbs.3c3t.com’ãzSÞ¾PïX
中等风化´~І0Þ¤rÃbbs.3c3t.com’ãzSÞ¾PïX
2000~4000´~І0Þ¤rÃbbs.3c3t.com’ãzSÞ¾PïX
0.6~0.8´~І0Þ¤rÃbbs.3c3t.com’ãzSÞ¾PïX
0.4~0.8´~І0Þ¤rÃbbs.3c3t.com’ãzSÞ¾PïX
-´~І0Þ¤rÃbbs.3c3t.com’ãzSÞ¾PïX
5~8´~І0Þ¤rÃbbs.3c3t.com’ãzSÞ¾PïX
8~18´~І0Þ¤rÃbbs.3c3t.com’ãzSÞ¾PïX
强风化´~І0Þ¤rÃbbs.3c3t.com’ãzSÞ¾PïX
1000~2000´~І0Þ¤rÃbbs.3c3t.com’ãzSÞ¾PïX
0.4~0.6´~І0Þ¤rÃbbs.3c3t.com’ãzSÞ¾PïX
<0.4´~І0Þ¤rÃbbs.3c3t.com’ãzSÞ¾PïX
≥50´~І0Þ¤rÃbbs.3c3t.com’ãzSÞ¾PïX
1~5´~І0Þ¤rÃbbs.3c3t.com’ãzSÞ¾PïX
2~8´~І0Þ¤rÃbbs.3c3t.com’ãzSÞ¾PïX
全风化´~І0Þ¤rÃbbs.3c3t.com’ãzSÞ¾PïX
500~1000´~І0Þ¤rÃbbs.3c3t.com’ãzSÞ¾PïX
0.2~0.4´~І0Þ¤rÃbbs.3c3t.com’ãzSÞ¾PïX
-´~І0Þ¤rÃbbs.3c3t.com’ãzSÞ¾PïX
50>N≥30´~І0Þ¤rÃbbs.3c3t.com’ãzSÞ¾PïX
<1´~І0Þ¤rÃbbs.3c3t.com’ãzSÞ¾PïX
<2´~І0Þ¤rÃbbs.3c3t.com’ãzSÞ¾PïX
残积土´~І0Þ¤rÃbbs.3c3t.com’ãzSÞ¾PïX
<500´~І0Þ¤rÃbbs.3c3t.com’ãzSÞ¾PïX
<0.2´~І0Þ¤rÃbbs.3c3t.com’ãzSÞ¾PïX
-´~І0Þ¤rÃbbs.3c3t.com’ãzSÞ¾PïX
<30´~І0Þ¤rÃbbs.3c3t.com’ãzSÞ¾PïX
´~І0Þ¤rÃbbs.3c3t.com’ãzSÞ¾PïX
´~І0Þ¤rÃbbs.3c3t.com’ãzSÞ¾PïX
软质岩石´~І0Þ¤rÃbbs.3c3t.com’ãzSÞ¾PïX
新鲜(未风化)´~І0Þ¤rÃbbs.3c3t.com’ãzSÞ¾PïX
>4000´~І0Þ¤rÃbbs.3c3t.com’ãzSÞ¾PïX
0.9~1.0´~І0Þ¤rÃbbs.3c3t.com’ãzSÞ¾PïX
0.9~1.0´~І0Þ¤rÃbbs.3c3t.com’ãzSÞ¾PïX
´~І0Þ¤rÃbbs.3c3t.com’ãzSÞ¾PïX
´~І0Þ¤rÃbbs.3c3t.com’ãzSÞ¾PïX
´~І0Þ¤rÃbbs.3c3t.com’ãzSÞ¾PïX
微风化´~І0Þ¤rÃbbs.3c3t.com’ãzSÞ¾PïX
3000~4000´~І0Þ¤rÃbbs.3c3t.com’ãzSÞ¾PïX
0.8~0.9´~І0Þ¤rÃbbs.3c3t.com’ãzSÞ¾PïX
0.8~0.9´~І0Þ¤rÃbbs.3c3t.com’ãzSÞ¾PïX
´~І0Þ¤rÃbbs.3c3t.com’ãzSÞ¾PïX
´~І0Þ¤rÃbbs.3c3t.com’ãzSÞ¾PïX
´~І0Þ¤rÃbbs.3c3t.com’ãzSÞ¾PïX
中等风化´~І0Þ¤rÃbbs.3c3t.com’ãzSÞ¾PïX
1500~3000´~І0Þ¤rÃbbs.3c3t.com’ãzSÞ¾PïX
0.5~0.8´~І0Þ¤rÃbbs.3c3t.com’ãzSÞ¾PïX
0.3~0.8´~І0Þ¤rÃbbs.3c3t.com’ãzSÞ¾PïX
´~І0Þ¤rÃbbs.3c3t.com’ãzSÞ¾PïX
´~І0Þ¤rÃbbs.3c3t.com’ãzSÞ¾PïX
´~І0Þ¤rÃbbs.3c3t.com’ãzSÞ¾PïX
强风化´~І0Þ¤rÃbbs.3c3t.com’ãzSÞ¾PïX
700~1500´~І0Þ¤rÃbbs.3c3t.com’ãzSÞ¾PïX
0.3~0.5´~І0Þ¤rÃbbs.3c3t.com’ãzSÞ¾PïX
<0.3´~І0Þ¤rÃbbs.3c3t.com’ãzSÞ¾PïX
´~І0Þ¤rÃbbs.3c3t.com’ãzSÞ¾PïX
´~І0Þ¤rÃbbs.3c3t.com’ãzSÞ¾PïX
´~І0Þ¤rÃbbs.3c3t.com’ãzSÞ¾PïX
全风化´~І0Þ¤rÃbbs.3c3t.com’ãzSÞ¾PïX
300~700´~І0Þ¤rÃbbs.3c3t.com’ãzSÞ¾PïX
0.1~0.3´~І0Þ¤rÃbbs.3c3t.com’ãzSÞ¾PïX
-´~І0Þ¤rÃbbs.3c3t.com’ãzSÞ¾PïX
´~І0Þ¤rÃbbs.3c3t.com’ãzSÞ¾PïX
´~І0Þ¤rÃbbs.3c3t.com’ãzSÞ¾PïX
´~І0Þ¤rÃbbs.3c3t.com’ãzSÞ¾PïX
残积土´~І0Þ¤rÃbbs.3c3t.com’ãzSÞ¾PïX
<300´~І0Þ¤rÃbbs.3c3t.com’ãzSÞ¾PïX
<0.1´~І0Þ¤rÃbbs.3c3t.com’ãzSÞ¾PïX
-´~І0Þ¤rÃbbs.3c3t.com’ãzSÞ¾PïX
´~І0Þ¤rÃbbs.3c3t.com’ãzSÞ¾PïX
´~І0Þ¤rÃbbs.3c3t.com’ãzSÞ¾PïX
´~І0Þ¤rÃbbs.3c3t.com’ãzSÞ¾PïX
´~І0Þ¤rÃbbs.3c3t.com’ãzSÞ¾PïX
´~І0Þ¤rÃbbs.3c3t.com’ãzSÞ¾PïX
´~І0Þ¤rÃbbs.3c3t.com’ãzSÞ¾PïX
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