岩石力学参数的非线性随机反分析

Nonlinear or stochastic back analysis of rock mechianical parameter

从概率统计学估计原理出发,考虑工程中实测位移的随机波动性,应用随机反分析的目标函数,并得出反演参数方差计算公式。引用弹塑性开裂模型描述岩体的性态,非线性迭代采用收敛稳定的子增量变Kp法。同最小二乘法反分析作比较,研究结果表明随机反分析更符合实际岩石工程的实际情况。

Based on probability and statistics the object function of nonlinear displacement stochastic back analysis was applied and the formulation of prameter covariance was given in terms of the stochastic deformation and material parameters.Elastic-plastic crack model was applied in rock mass.The increment changeable K p method was used in nonlinear iteration.It can be found from the results that the stochastic back analysis is more suitable for the need of rock engineering than the least square method.