深埋低水平地应力硬质岩隧道稳定性研究
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摘要
低地应力是地下工程中极易被忽视的一种应力状态,它对地下工程稳定性有重要影响。本文通过分析地应力影响特征,指出了地应力分析应从地质构造和构造形迹分析入手。鉴于地应力测量中存在多种问题,提出了地下工程低地应力的地质标志判别方法。结合低水平地应力条件,给出了块体组合结构面强度的分级办法,推导出地下工程中常见块体的二维计算公式,并将其应用于工程实践,结果证明该计算方法比较符合实际。
Low horizontal ground stress is a stress state which is always neglected in underground engineering.It has important influences on the stability of underground engineering.By analyzing the ground stress influencing characteristics,it is pointed out that the ground stress analysis should begin with an analysis of geological formation and structure features.Due to different problems existing in the ground stress measurement,geological mark judgment methods of low horizontal ground stress in underground engineering are provided in this paper. With a combination of the low horizontal ground stress conditions,the classification methods of discontinuity strength of block combinations are also suggested,and a common 2-D block calculation relation is deduced.A practicable application is carried out with reasonable results.
Low horizontal ground stress is a stress state which is always neglected in underground engineering.It has important influences on the stability of underground engineering.By analyzing the ground stress influencing characteristics,it is pointed out that the ground stress analysis should begin with an analysis of geological formation and structure features.Due to different problems existing in the ground stress measurement,geological mark judgment methods of low horizontal ground stress in underground engineering are provided in this paper. With a combination of the low horizontal ground stress conditions,the classification methods of discontinuity strength of block combinations are also suggested,and a common 2-D block calculation relation is deduced.A practicable application is carried out with reasonable results.
引文
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[2]徐林生,王兰生.二郎山公路隧道岩爆发生规律与岩爆预测研究[J].岩土工程学报,1999,21(5):569-572.
[3]丁恩保.低地应力及其工程地质意义[J].水文地质工程地质,1993,20(4):1-4.
[4]孙广忠.地质工程理论与实践[M].北京:地震出版社,1996:56-62.
[5]陶振宇.对岩体初始应力的初步认识[J].水文地质工程地质,1980(2):12-17.
[6]胡夏嵩.低地应力区地下洞室围岩压力计算方法及应用[J].水文地质工程地质,2005,32(2):87-91.
[7]长春地质学院地质力学教研室.地质力学[M].北京:地质出版社,1979:34-35.
[8]李先炜.岩体力学性质[M].北京:煤炭工业出版社,1990:20-22.
[9]夏才初,孙宗颀.工程岩体节理力学[M].上海:同济大学出版社,2002:1-6.
[10]夏才初.节理表面波纹度对其闭合性质的影响[J].工程地质学报,1995,3(2):47-53.
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