岩石力学参数的区间参数摄动反分析方法

Interval papameter perturbation back analysis on mechanical parameter of surrounding rocks

考虑岩体量测数据及其力学参数的不确定性,将它们视为未知但有界的物理量,用区间变量表示,提出了区间参数有限元控制方程的摄动求解方法,进一步建立了识别力学参数的区间反分析模型。基于区间参数摄动求解方法,分两步依次辨识出需反演力学参数的区间均值及其离差,得到力学参数的区间范围。以某巨型水电工程地下厂房模型洞围岩力学参数反演为例,研究了量测精度对结果的影响,计算结果表明该方法是合理可行的。

The unknown but bounded property of the measured data and mechanical parameters is considered and interval variables are used to denote the measured data and mechanical parameters in this paper. The interval parameter perturbation method is presented to solve the equations of interval FEM and the interval back analysis model is put forward. Based on the interval parameter perturbation method, the mean and deviation of the mechanical parameters are obtained by the two-step back analysis. For the example of the mechanical parameter back analysis of surrounding rocks of the model cave in the large hydroelectric power station, the effect on the measure precision is studied. It can be found from the result that the method is reasonable and feasible.