地下气库(LPG)洞室围岩稳定性数值分析
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摘要
地下气库的围岩稳定性关系到地下气库的安全与使用。影响地下洞室稳定的因素很多,解析法虽然可以得到精确解,但是只能针对圆形洞室。而数值计算方法可以计算各种情况下围岩的应力、变形、塑性分布等情况。利用有限元分析软件分析了洞室形状对围岩稳定性的影响,确定了合理的洞形;讨论了围岩应力应变随深度的变化规律,以及不同的支护类型对围岩变形的影响,确定了经济合理的支护类型。最终为该地质条件下的洞室围岩稳定设计提供了依据。
Influenced by various factors,the stability of wall rock in an underground LPG tunnel is of vital importance to its safe service. With analytical methods exact solutions can be obtained,which are applicable to round-shaped tunnels only;while numerical methods can be applied to the calculation of stress,deformation and plasticity distribution for various tunnel shapes.In this paper,FEM software is applied to analyze the influence of tunnel shape on the wall stability of rock to determine a reasonable tunnel shape;the distributions of stress and strain along depth and the influence of support type on wall rock deformation are discussed to determine an economical and reasonable support type;and hence a sound basis for stability design of tunnel wall rock under a given geological condition is established.
Influenced by various factors,the stability of wall rock in an underground LPG tunnel is of vital importance to its safe service. With analytical methods exact solutions can be obtained,which are applicable to round-shaped tunnels only;while numerical methods can be applied to the calculation of stress,deformation and plasticity distribution for various tunnel shapes.In this paper,FEM software is applied to analyze the influence of tunnel shape on the wall stability of rock to determine a reasonable tunnel shape;the distributions of stress and strain along depth and the influence of support type on wall rock deformation are discussed to determine an economical and reasonable support type;and hence a sound basis for stability design of tunnel wall rock under a given geological condition is established.
引文
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[2]朱伯芳.有限单元法原理与应用[M].北京:中国水利水电出版社,1998.
[3]刘红军,董淑云.深基坑支护结构设计的平面应变有限元法[J].青岛海洋大学学报:自然科学版,2003,33(4):581-586.
[4]殷宗泽.土体本构模型剖析[J].岩土工程学报,1996,18(4):95-97.
[5]钱家欢,殷宗泽.土工原理与计算(第二版)[M].中国水利电力出版社,1996:44-106.
[6]Goodman R E,Taylor R L,Brekke T.A model for the mechanics ofjointed rock[J].JSMFD ASCE,1968.94(3):637-660.
[7]秦四清.深基坑支护优化设计理论与实践[M].北京:地震出版社,1999.
[8]Desai C S,Zamam M M.Thin-layer element for interfaces and joints[J].Inter J Numer Methods Geo,1984,8(1):19-43.
[9]刘红军,王秀海,郑建国.土钉墙支护的非线性有限元法[J].中国海洋大学学报:自然科学版,2005,35(30):439-444.
[10]马万权,程崇国.张鹏勇.阳宗隧道试验段动态开挖过程的数值模拟[J].地下空间,2003,23(3):256-259.
[11]王青海,李晓红,艾吉人,等.通渝隧道围岩变形和岩爆的数值模拟[J].地下空间,2003,23(3):291-295.
[12]雷开祥,周晓军.渝怀铁路彭水隧道出口大跨段施工方案的数值分析[J].地下空间,2002,22(3):191-196.
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