洞室围岩二维粘弹性反演计算的边界单元法

BEM of Time-Dependent Back Analysis Calculation of IES and Parameters

本文提出了一种反演确定围岩初始地应力及其参数的新方法,包括描述岩体变形的粘弹性时间效应的参数的反演确定。文中在假设围岩的性态服从三单元粘弹性模型以后,依据现场量测信息建立了反演计算的方程组,包括进行线弹性反演计算的虚拟应力法方程,以及确定参数E_2和η_2的反演计算方程。此外,文末还给出了算例验证,以及以这一方法进行的工程实例计算分析与讨论。

This paper gives a new method to determine IES (Initial Earth Stresses) and parameters in surrounding rock of a cavity, including those indicating timedependent behaviour of rock mass. The fictitious stress method of BEM is employed and the three-element viscoelastic model is adopted here. Corresponding to data measured in situ, a series of equations for back analysis calculation has been established, including those to determine parameters E_2 and η_2 in the three-element viscoelastic model. An example and a case study are described at the end of the paper to verify the method.