NUMERICAL SIMULATION OF COUPLED HYDRO-MECHANICAL BEHAVIOR OF PARTIALLY SATURATED FRACTURED POROUS MEDIA DURING EXCAVATION OF HIGH PRESSURE TUNNELS AT JINPING MOUNTAIN
Coupled hydro-mechanical (HM) processes of saturated and unsaturated fractured rock mass during tunnel excavation under high initial stresses and high water pressure conditions, located at the Jinping Mountain in China, are analyzed in this paper. A three-dimentional numerical model is developed to perform the analysis. The effective continuum approach is employed to model unsaturated fluid flow in a matrix/fracture system. Some highly permeable fractures and large fracture zones are discretely defined by special fracture elements in the finite-element mesh. The rock containing a high density of parallel joint surfaces is approximated by the anisotropic continuum based on the compliant joint model for mechanical response. To simulate the change of hydraulic properties-, the deformation-dependent permeability is obtained. During the excavation stage, the concrete lining is treated as a low-permeability porous medium. Some results are presented and discussed in details.
Wei Chen Huaining Ruan
Institute of Geotechnical Engineering, Hohai University, Nanjing 210098,P.R.China
国际会议
南京
英文
698-703
2006-05-22（万方平台首次上网日期，不代表论文的发表时间）