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