初始地应力场的确定是地下洞室稳定性评价的基础。在对现场实测地应力资料分析的基础上，研究了断层等地质构造对初始地应力场分布的影响机理，指出岩体变形模量比是影响应力的关键因素之一。研究了能反映断层引起应力释放效应的初始地应力场反演分析的变刚度方法。考虑与不考虑断层影响情况下的某工程初始地应力场的计算结果和实测结果对比表明，考虑断层影响的结果与实测结果更接近，从而证明了断层应力释放效应作用及基于岩体变刚度的初始地应力反分析方法的合理性。

The determination of initial geo-stress of rock mass is the basis of stability assessment for underground cavern. By analyzing the in-situ measurements of geo-stress, we investigated the effect of geological structure such as fault on the initial geostress distribution, and found that the deformation modulus ratio of the surrounding rock mass is one of the most important factors affecting the initial geo-stress. We also presented a back analysis method in consideration of  the variable stiffness which reflects the stress release induced by faults. The calculation results of initial geostress involving and not involving the effect of fault effect are compared with the measured values, and it's found that the result considering the fault effect is more consistent with the measured result, which verifies the rationality of this method. 