Reliability research of surrounding rock based on elasto-plastic analysis of stochastic field finite element method

In this paper,strength and deformation parameters of surrounding rock are simulated as two-dimensional stable normal stochastic fields. By use of discretization,each stochastic field can be divided into a group of stochastic variables on discreted elements. A stochastic field finite element method (SFFEM) for elasto-plastic silution of surrounding rock is proposed. Besed on a probabilistic yield criterion and the concept of target yield probability,some probabilistic plastic zones of surrounding rock corresponding to different levels of target yield probabilitiy can be obtained by SFFEM and the system reliability of surrounding rock can be properly appreciated and estimated.