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为获得较为合理和准确的初始地应力场分布,考虑了复杂地质条件中地形地貌及断层对地应力场的影响,提出了结合地层剥蚀模拟和侧压力系数法的地应力反演分析方法.该方法对侧压力系数法进行了改进,通过逐次开挖地层近似模拟地表剥蚀过程对现今地应力场的影响,并采用了隐含断层单元,将断层力学效应反映在岩体单元中,从而模拟断层附近地应力场的分布规律.最后对水电站地下厂房区域的地应力场进行了反演分析,结果表明:测点反演值与实测值符合良好,反演结果充分反映了河谷及断层区域地应力场的基本分布规律.
In order to obtain a more reasonable and accurate initial geostress field distribution, considering the influence of topography and fault on geostress in complex geologic conditions, a method of geostress inversion analysis combined with denudation modeling and lateral pressure coefficient method is proposed. Methods The lateral pressure coefficient method was improved. The effect of surface erosion process on the current geostress field was simulated by successive excavation of strata, and implied fault units were adopted to reflect the fault mechanics effect in the unit of rock mass so as to simulate the fault The results show that the inversion value of the measuring point is in good agreement with the measured value and the inversion result fully reflects the in-situ stress of the valley and the fault area The basic distribution of the field.