Seepage-stress coupling constitutive model of anisotropic soft rock

来源期刊：中南大学学报(英文版)2009年第1期

论文作者：张向霞 杨林德 闫小波

文章页码：149 - 153

Key words：soft rock; stress—strain relation; seepage-stress coupling; constitutive model; coefficient of permeability

Abstract: To provide a seepage-stress coupling constitutive model that can directly describe the seepage-stress coupling relationship, a series of one-dimensional seepage-stress coupling tests on two kinds of soft rock (argillaceous siltstone and brown mudstone) were performed by using an MTS-815.02 tri-axial rock mechanics test system, with which the stress—strain curves according to the seepage variation were obtained. Based on the experimental results and by employing Hooke’s law, the formulation of the coefficient of strain-dependent permeability was presented and introduced to establish a coupling model. In addition, the mathematical expression and the incremental formulation for coupling model were advanced, in which five parameters that can be respectively determined by using the experimental results were included. The calculated results show that the proposed coupling model is capable of simulating the stress—strain relationship with considering the seepage-stress coupling in the nonlinear elastic stage of two kinds of soft rock.

基金信息：the National Natural Science Foundation of China
the Joint Fund of Yalong River Hydropower Development, China