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为考虑地形地貌以及节理、断层等岩体构造对原始地应力场的影响,通常选用较大计算范围以模拟原始地应力场。然后取较小计算范围进行二次细分网格,以便较准确地模拟地下厂房分步开挖的动态过程。二次细分网格位移边界值采用等参逆变换法由一次网格的计算结果插值得到。介绍了等参逆变换法的基本原理及其在水布垭地下厂房原始地应力场计算中的应用。
In order to consider the impact of topography and geomorphology and the structure of joints and faults on the original geostress field, a large calculation range is usually chosen to simulate the original geostress field. Then take a smaller calculation range of the second subdivision grid in order to more accurately simulate the underground plant step by step excavation of the dynamic process. The quadratic subdivision grid displacement boundary value is obtained by interpolating the calculation results of a grid using the isoparametric inverse transformation method. The basic principle of isoparametric inverse transform method and its application in the calculation of the original ground stress field of Shuibuya underground powerhouse are introduced.