Bulletin of Computational Science Research Center, Hosei University

異方性降伏関数

岩盤

非線形最適化手法

hardening

anisotropic yield function

rock mass

nonlinear optimization method

In recent years, as to designs and constructions of the civil structures such as hydroelectric power plant, mechanical behavior of geological materials are estimated by the numerical analysis using the finite element method, and the objective technical judgement is required. In this request, great importance is attached to strength anisotropy following the excavation of rock structures such as the large slope and the underground cavern. In this study, the numerical analysis program for the excavation problem of rock mass was developed, and the stability of the excavated rock structure with anisotropic strength was evaluated by a proposed hardening-type anisotropic yield function depending on hydrostatic pressure. The material parameters included in this yield function can be evaluated by a nonlinear optimization method using axisymmetric uniaxial and triaxial compression test results. This method does not require difficult tests such as simple shear tests for their evaluation. And then, the usefulness of numerical analysis program and the expression of the proposed yield function were investigated using the numerical analysis results.

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