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对AutoCAD进行了面向对象二次开发,利用程序自动读取CAD地形图地面高程并快速生成反映地表起伏变化的三维有限元计算网格模型.采用三维非线性有限元反演回归分析计算方法,提出了三维应力侧压系数函数拟合法,通过三维有限元开挖模拟反演岩体初始地应力场.对蒲石河抽水蓄能电站地下厂房区域初始地应力场进行了反演回归分析,结果表明:实测点地应力拟合较好,该方法计算快速准确,较合理地反映了地形地貌对初始地应力场规律的影响.
The object-oriented secondary development of AutoCAD was carried out, and the program automatically read the ground elevation of CAD topographic map and quickly generate the three-dimensional finite element mesh model which reflects the change of surface undulation.Using the regression analysis and calculation method of three-dimensional nonlinear finite element method, The three-dimensional stress lateral pressure coefficient function fitting method was used to simulate the initial in-situ stress field of the rock mass by means of three-dimensional finite element excavation simulation.The initial geostress field of the underground powerhouse area of Pushihe Pumped Storage Power Station was inverted and analyzed. The results show that: The measured ground stress is well fitted, and the method is fast and accurate, which can reasonably reflect the influence of topography on the law of initial geostress field.