复杂初始地应力场的反演分析

Back Analysis on Complex Initial Geo-stress Field

初始地应力是地下工程稳定性分析的重要荷载,线性回归法是现今初始地应力场分析方法中最常用的方法之一。当研究区域内应力条件复杂时,常用的考虑整个模型区域的线性回归法(文中称之为整体回归法)往往不能得到令人满意的结果。采用分区回归法作为相应的处理方法,并给出一个简单算例。计算结果表明该方法能有效克服整体回归的不足,提高回归结果的精度;同时,该法原理简单,易于理解,便于被工程设计人员接受。

Initial geo-stress is the important load for analysis of underground projects, and linear regression method is one of the most widely used methods in the analysis of initial geo-stress field nowadays. However, the method that is used to take the whole model into account and was commonly used before （referred to as ＇whole regression＇ in this paper） can not get satisfactory results when stress condition of a study area is complex. In view of this, a measure known as ＇zone regression＇ is proposed in this paper together with an example study, and the results demonstrate that the proposed method can remedy the shortages of whole regression and improve the accuracy of regression results; meanwhile, as its principle is rather simple, it is easy to be understood and accepted by project designers.