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