【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。更多还原

【Abstract】 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.更多还原