低应力环境岩体软弱夹层的渗透特征
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摘要
低地应力是指在一定边界条件下最小应力值低于自重场应力最小值的现象。通过近几年的研究发现,我国西部特殊构造部位有低地应力存在。低地应力区软弱层带十分发育,岩体呈现明显的各向异性和强透水性,断层泥在软弱层带中的含量少,且多不连续,起不到很好的阻水作用;而次生张裂带最容易产生渗透变形和渗透破坏。在低地应力环境条件下岩体中软弱夹层对水利水电工程的建设和运营起控制作用,所以一定要采取相应的措施加以处理。
Lower earth stress is a phenomenon that the minimum stress is no more than the minimum of self-weight stress under given conditions. Through research of recent years,it is found that there lies lower earth stress in special tectonic part in west China. Because of well developed weak intercalation in lower earth stress zone,rock mass displays strong permeability and obvious anisotropy,and fault gouge is so rare and non-continuous in rock mass that it hardly forms aquiclude. At the same time,secondary tension crack zones easily cause seepage deformation and failure. Under lower earth stress,weak intercalation within rock mass will control construction and operation of both irrigation works and hydropower station,so cautious emergency measures should be employed to deal with weak intercalation.
Lower earth stress is a phenomenon that the minimum stress is no more than the minimum of self-weight stress under given conditions. Through research of recent years,it is found that there lies lower earth stress in special tectonic part in west China. Because of well developed weak intercalation in lower earth stress zone,rock mass displays strong permeability and obvious anisotropy,and fault gouge is so rare and non-continuous in rock mass that it hardly forms aquiclude. At the same time,secondary tension crack zones easily cause seepage deformation and failure. Under lower earth stress,weak intercalation within rock mass will control construction and operation of both irrigation works and hydropower station,so cautious emergency measures should be employed to deal with weak intercalation.
引文
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6谌文武.黄河黑山峡大柳树坝址松动岩体中断层泥的工程性质[硕士毕业论文][D].兰州:兰州大学,1992
7郝哲,王介强,刘斌.岩体渗透注浆的理论研究[J].岩石力学与工程学报,2001,20(4):492～496
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9水利部天津水利水电勘测设计研究院勘察院.黄河大柳树水利枢纽坝址左岸固结灌浆试验报告[R].天津:1998
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11张咸恭.专门工程地质学[M].北京:地质出版社,1988
12张咸恭.工程地质学(下)[M].北京:地质出版社,1987
13丁国瑜.中国岩石圈动力学概要[M].北京:地震出版社,1991
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15崔冠英,潘品蒸.水利工程地质[M].北京:水利电力出版社,1985
16菀连菊.工程渗流力学及应用[M].北京:中国建材工业出版社,2001
2韩文峰.黄河黑山峡小观音坝址工程地质研究[M].兰州:兰州大学出版社,1999
3谌文武,梁收运.松动岩体的工程地质研究[J].岩石力学与工程学报,2000,19(6):751～755
4谌文武.黄河黑山峡大柳树坝址断层泥工程地质研究[A].见:第四次全国岩石力学与工程学术大会甘肃岩石力学与工程进展[C].兰州:兰州大学出版社,1996
5刘高,谌文武,韩文峰.黄河黑山峡小观音坝址高地应力问题研究[J].兰州大学学报(自然科学),2001,37(3):121～126
6谌文武.黄河黑山峡大柳树坝址松动岩体中断层泥的工程性质[硕士毕业论文][D].兰州:兰州大学,1992
7郝哲,王介强,刘斌.岩体渗透注浆的理论研究[J].岩石力学与工程学报,2001,20(4):492～496
8仵彦卿,张倬元.岩体水力学导论[M].成都:西南交大出版社,1990
9水利部天津水利水电勘测设计研究院勘察院.黄河大柳树水利枢纽坝址左岸固结灌浆试验报告[R].天津:1998
10水利部天津水利水电勘测设计研究院勘察院.黄河大柳树水利枢纽坝址水文地质勘察报告[R].2000
11张咸恭.专门工程地质学[M].北京:地质出版社,1988
12张咸恭.工程地质学(下)[M].北京:地质出版社,1987
13丁国瑜.中国岩石圈动力学概要[M].北京:地震出版社,1991
14刘厚健.西北地区大型电力工程规划选址中常见的地质问题[J].工程地质学报,2002,10(增):581～585
15崔冠英,潘品蒸.水利工程地质[M].北京:水利电力出版社,1985
16菀连菊.工程渗流力学及应用[M].北京:中国建材工业出版社,2001
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