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Seepage-stress coupling constitutive model of anisotropic soft rock

Journal of Central South University 2009年第1期16卷 149-153页

作者：张向霞杨林德闫小波 Research Center for Urban Safety and Security Kobe University 1-1 Rokkodai-cho Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education Tongji University College of Civil Engineering Fuzhou University

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.

关键词： soft rock stress--strain relation seepage-stress coupling constitutive model coefficient of permeability

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