本文从实用角度出发,论述利用大型通用软件MSC.Marc及其用户子程序实现初始地应力场施加的方法,在此基础上模拟坝基岩体的开挖;考虑到开挖施工过程的影响,提出基于增量位移模式的加权逆解反分析计算方法;以小湾拱坝为工程实例,建立模拟坝基开挖的有限元模型,反演该坝基综合变形模量,获得坝基的初始变形场,为后期模拟小湾坝体浇筑加载过程奠定基础;最后还与遗传优化算法计算结果作了对比。计算结果表明,文中提出的方法方便简洁,结果合理,具有较强的实用性。
For practicability, the method of the application of 3D initial crustal stress field by using MSC. Marc and its user subroutines is discussed in this paper. Based on the method, the excavation of dam base is simulated by converse analysis, the weighted inversion method with increment displacement is put forward. Taking Xiaowan arch dam as the engineering example, the deformation modulus and the initial deformation field for the dam base are obtained separately by the excavation FEM model. At last, the comparison with the genetic algorithm is also made, it provides the basis for the pouring simulation and the conclusions for the other similar projects.