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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
                                                                                                                        
        =8gk­å{bbs.3c3t.comEOù4h§z¬@l
=8gk­å{bbs.3c3t.comEOù4h§z¬@l
                                                                                                                        
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):=8gk­å{bbs.3c3t.comEOù4h§z¬@l
=8gk­å{bbs.3c3t.comEOù4h§z¬@l
P=8gk­å{bbs.3c3t.comEOù4h§z¬@l
IS==8gk­å{bbs.3c3t.comEOù4h§z¬@l
D2(5.3.1-2)=8gk­å{bbs.3c3t.comEOù4h§z¬@l
  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。=8gk­å{bbs.3c3t.comEOù4h§z¬@l
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)=8gk­å{bbs.3c3t.comEOù4h§z¬@l
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)=8gk­å{bbs.3c3t.comEOù4h§z¬@l
<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
=8gk­å{bbs.3c3t.comEOù4h§z¬@l
 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=8gk­å{bbs.3c3t.comEOù4h§z¬@l
=8gk­å{bbs.3c3t.comEOù4h§z¬@l
Vpw=8gk­å{bbs.3c3t.comEOù4h§z¬@l
KV==8gk­å{bbs.3c3t.comEOù4h§z¬@l
Vpf(5.3.1-3) =8gk­å{bbs.3c3t.comEOù4h§z¬@l
  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。=8gk­å{bbs.3c3t.comEOù4h§z¬@l
表5.3.1-6 岩石按风化程度分类标准=8gk­å{bbs.3c3t.comEOù4h§z¬@l
岩石=8gk­å{bbs.3c3t.comEOù4h§z¬@l
类别=8gk­å{bbs.3c3t.comEOù4h§z¬@l
风化程度=8gk­å{bbs.3c3t.comEOù4h§z¬@l
风化程度划分参数=8gk­å{bbs.3c3t.comEOù4h§z¬@l
压缩波速度υp=8gk­å{bbs.3c3t.comEOù4h§z¬@l
(m/s)=8gk­å{bbs.3c3t.comEOù4h§z¬@l
波速比=8gk­å{bbs.3c3t.comEOù4h§z¬@l
Kv=8gk­å{bbs.3c3t.comEOù4h§z¬@l
风化系数=8gk­å{bbs.3c3t.comEOù4h§z¬@l
Kf=8gk­å{bbs.3c3t.comEOù4h§z¬@l
标贯击数=8gk­å{bbs.3c3t.comEOù4h§z¬@l
N63.5=8gk­å{bbs.3c3t.comEOù4h§z¬@l
点荷载强度Is(50)(MPa)=8gk­å{bbs.3c3t.comEOù4h§z¬@l
动弹模Ed=8gk­å{bbs.3c3t.comEOù4h§z¬@l
(×103MPa)=8gk­å{bbs.3c3t.comEOù4h§z¬@l
硬质=8gk­å{bbs.3c3t.comEOù4h§z¬@l
岩石=8gk­å{bbs.3c3t.comEOù4h§z¬@l
新鲜(未风化)=8gk­å{bbs.3c3t.comEOù4h§z¬@l
>5000=8gk­å{bbs.3c3t.comEOù4h§z¬@l
0.9~1.0=8gk­å{bbs.3c3t.comEOù4h§z¬@l
0.9~1.0=8gk­å{bbs.3c3t.comEOù4h§z¬@l
-=8gk­å{bbs.3c3t.comEOù4h§z¬@l
>12=8gk­å{bbs.3c3t.comEOù4h§z¬@l
>36=8gk­å{bbs.3c3t.comEOù4h§z¬@l
微风化=8gk­å{bbs.3c3t.comEOù4h§z¬@l
4000~5000=8gk­å{bbs.3c3t.comEOù4h§z¬@l
0.8~0.9=8gk­å{bbs.3c3t.comEOù4h§z¬@l
0.8~0.9=8gk­å{bbs.3c3t.comEOù4h§z¬@l
-=8gk­å{bbs.3c3t.comEOù4h§z¬@l
8~12=8gk­å{bbs.3c3t.comEOù4h§z¬@l
18~36=8gk­å{bbs.3c3t.comEOù4h§z¬@l
中等风化=8gk­å{bbs.3c3t.comEOù4h§z¬@l
2000~4000=8gk­å{bbs.3c3t.comEOù4h§z¬@l
0.6~0.8=8gk­å{bbs.3c3t.comEOù4h§z¬@l
0.4~0.8=8gk­å{bbs.3c3t.comEOù4h§z¬@l
-=8gk­å{bbs.3c3t.comEOù4h§z¬@l
5~8=8gk­å{bbs.3c3t.comEOù4h§z¬@l
8~18=8gk­å{bbs.3c3t.comEOù4h§z¬@l
强风化=8gk­å{bbs.3c3t.comEOù4h§z¬@l
1000~2000=8gk­å{bbs.3c3t.comEOù4h§z¬@l
0.4~0.6=8gk­å{bbs.3c3t.comEOù4h§z¬@l
<0.4=8gk­å{bbs.3c3t.comEOù4h§z¬@l
≥50=8gk­å{bbs.3c3t.comEOù4h§z¬@l
1~5=8gk­å{bbs.3c3t.comEOù4h§z¬@l
2~8=8gk­å{bbs.3c3t.comEOù4h§z¬@l
全风化=8gk­å{bbs.3c3t.comEOù4h§z¬@l
500~1000=8gk­å{bbs.3c3t.comEOù4h§z¬@l
0.2~0.4=8gk­å{bbs.3c3t.comEOù4h§z¬@l
-=8gk­å{bbs.3c3t.comEOù4h§z¬@l
50>N≥30=8gk­å{bbs.3c3t.comEOù4h§z¬@l
<1=8gk­å{bbs.3c3t.comEOù4h§z¬@l
<2=8gk­å{bbs.3c3t.comEOù4h§z¬@l
残积土=8gk­å{bbs.3c3t.comEOù4h§z¬@l
<500=8gk­å{bbs.3c3t.comEOù4h§z¬@l
<0.2=8gk­å{bbs.3c3t.comEOù4h§z¬@l
-=8gk­å{bbs.3c3t.comEOù4h§z¬@l
<30=8gk­å{bbs.3c3t.comEOù4h§z¬@l
=8gk­å{bbs.3c3t.comEOù4h§z¬@l
=8gk­å{bbs.3c3t.comEOù4h§z¬@l
软质岩石=8gk­å{bbs.3c3t.comEOù4h§z¬@l
新鲜(未风化)=8gk­å{bbs.3c3t.comEOù4h§z¬@l
>4000=8gk­å{bbs.3c3t.comEOù4h§z¬@l
0.9~1.0=8gk­å{bbs.3c3t.comEOù4h§z¬@l
0.9~1.0=8gk­å{bbs.3c3t.comEOù4h§z¬@l
=8gk­å{bbs.3c3t.comEOù4h§z¬@l
=8gk­å{bbs.3c3t.comEOù4h§z¬@l
=8gk­å{bbs.3c3t.comEOù4h§z¬@l
微风化=8gk­å{bbs.3c3t.comEOù4h§z¬@l
3000~4000=8gk­å{bbs.3c3t.comEOù4h§z¬@l
0.8~0.9=8gk­å{bbs.3c3t.comEOù4h§z¬@l
0.8~0.9=8gk­å{bbs.3c3t.comEOù4h§z¬@l
=8gk­å{bbs.3c3t.comEOù4h§z¬@l
=8gk­å{bbs.3c3t.comEOù4h§z¬@l
=8gk­å{bbs.3c3t.comEOù4h§z¬@l
中等风化=8gk­å{bbs.3c3t.comEOù4h§z¬@l
1500~3000=8gk­å{bbs.3c3t.comEOù4h§z¬@l
0.5~0.8=8gk­å{bbs.3c3t.comEOù4h§z¬@l
0.3~0.8=8gk­å{bbs.3c3t.comEOù4h§z¬@l
=8gk­å{bbs.3c3t.comEOù4h§z¬@l
=8gk­å{bbs.3c3t.comEOù4h§z¬@l
=8gk­å{bbs.3c3t.comEOù4h§z¬@l
强风化=8gk­å{bbs.3c3t.comEOù4h§z¬@l
700~1500=8gk­å{bbs.3c3t.comEOù4h§z¬@l
0.3~0.5=8gk­å{bbs.3c3t.comEOù4h§z¬@l
<0.3=8gk­å{bbs.3c3t.comEOù4h§z¬@l
=8gk­å{bbs.3c3t.comEOù4h§z¬@l
=8gk­å{bbs.3c3t.comEOù4h§z¬@l
=8gk­å{bbs.3c3t.comEOù4h§z¬@l
全风化=8gk­å{bbs.3c3t.comEOù4h§z¬@l
300~700=8gk­å{bbs.3c3t.comEOù4h§z¬@l
0.1~0.3=8gk­å{bbs.3c3t.comEOù4h§z¬@l
-=8gk­å{bbs.3c3t.comEOù4h§z¬@l
=8gk­å{bbs.3c3t.comEOù4h§z¬@l
=8gk­å{bbs.3c3t.comEOù4h§z¬@l
=8gk­å{bbs.3c3t.comEOù4h§z¬@l
残积土=8gk­å{bbs.3c3t.comEOù4h§z¬@l
<300=8gk­å{bbs.3c3t.comEOù4h§z¬@l
<0.1=8gk­å{bbs.3c3t.comEOù4h§z¬@l
-=8gk­å{bbs.3c3t.comEOù4h§z¬@l
=8gk­å{bbs.3c3t.comEOù4h§z¬@l
=8gk­å{bbs.3c3t.comEOù4h§z¬@l
=8gk­å{bbs.3c3t.comEOù4h§z¬@l
=8gk­å{bbs.3c3t.comEOù4h§z¬@l
=8gk­å{bbs.3c3t.comEOù4h§z¬@l
=8gk­å{bbs.3c3t.comEOù4h§z¬@l
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