裂隙岩质边坡渗流与非连续变形耦合过程分析

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Abstract Hydro-mechanical coupling in fractured rock mass is one of the key factors controlling rock slope stability. In this paper，discrete fracture network(DFN) model is used to study fluid flow in fractured rock mass. The DFN has a simple concept with high efficiency and applicability，and it is one of the most effective means to study the fracture seepage problem. Discontinuous deformation analysis(DDA)，proposed specifically for the discontinuous nature of the fractured rock mass deformation calculations，is applicable to more realistic characterization of engineering rock mass. Combining DFN simulation and DDA，the hydro-mechanical coupling model is proposed；and instantaneous equilibrium equations of rock block system considering fracture seepage，which are used to research the effects of fractured rock mass deformation on fracture seepage and the failure characteristics of rock mass under hydro-mechanical coupling，are presented. By the proposed coupling model，stability of a slope near a large water reservoir is analyzed. Simulated results show that groundwater uplifts greatly with the reservoir impoundment；and hydro-mechanical coupling is intensified，which leads to some key parts of the fractured rock slope present large deformation or even damage，further triggering the failure of the slope. The case study verifies the effectiveness of the coupling model applied for slope stability analysis.

Key words： rock mechanics hydraulic-mechanical coupling discontinuous deformation analysis(DDA) discrete fracture network(DFN) slope stability analysis

Received: 11 January 2013

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https://rockmech.whrsm.ac.cn/EN/Y2013/V32/I6/1248

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