Abstract In this paper, aimed at the elasto-brittle-plastic circular opening under hydrostatic pressure, an elasto-plastic coupling model was adopted for an analytical study of stress and displacement of the surrounding rock. And based on the linear Mohr-Coulomb criterion and the non-associated flow rule, the analytical solution of the rock stress and deformation was deduced, thus determining theoretically the restrictive relationship between strength parameter and elasticity modulus in the post-failure region and giving the rules of rock stress and deformation in the post-failure region under different modulus deterioration conditions. The results show that the modulus deterioration may not result in variation of the plastic zone scope and the rock stress distribution, but it may contribute to the surge of rock deformation.
Abstract：
In this paper, aimed at the elasto-brittle-plastic circular opening under hydrostatic pressure, an elasto-plastic coupling model was adopted for an analytical study of stress and displacement of the surrounding rock. And based on the linear Mohr-Coulomb criterion and the non-associated flow rule, the analytical solution of the rock stress and deformation was deduced, thus determining theoretically the restrictive relationship between strength parameter and elasticity modulus in the post-failure region and giving the rules of rock stress and deformation in the post-failure region under different modulus deterioration conditions. The results show that the modulus deterioration may not result in variation of the plastic zone scope and the rock stress distribution, but it may contribute to the surge of rock deformation.
WANG Hong-Ying
.Analytical Solution for Elasto-Plastic Coupling of the Brittle Rock
in an Circular Opening
[J] MODERN TUNNELLING TECHNOLOGY, 2014,V51(6): 29-34
2014, Vol. 51 