(1. School of Urban Construction，Yangtze University，Jingzhou，Hubei 434023，China；2. State Key Laboratory of Geomechanics and Geotechnical Engineering，Institute of Rock and Soil Mechanics，Chinese Academy of Sciences，Wuhan，Hubei 430071，China；3. School of Petroleum Engineering，Yangtze University，Jingzhou，Hubei 434023，China)
Abstract：According to the reality of bedded rock salt and clay interlayer for underground oil or gas storage carven in China，considering the existing interface element between salt rock and weak interlayer，the interface element taking nodal displacement and pore pressure as degree of freedom，is used to simulate the initiation，propagation and fluid seepage of weak layers resulted from hydraulic damage. Based on the fluid-solid coupling theory of porous fluid diffusion and deformation，the coupled damage model of dual media for salt rock with formation interlayer is established. This model can depict the crack propagation process and reflect the seepage flow of interface. Then，some numerical simulations are carried out to analyze the seepage and crack propagation characteristics of high pressure fluid on interface between salt rock and clay. The results show that the fluid pressure decreases along the interface element direction and the aperture of the opened fracture is fan-shaped during the leakage process of high-pressure fluid along cavity surrounding rocks. It is concluded that the effects of interface seepage on pressure distribution are very important. For the tightness and stability of the oil and gas repository，the inner pressure of oil or gas repository should be controlled to avoid the oil and gas leakages on the interface for salt rock with interlayer.
贾善坡1，2，杨建平2，王越之3，谭贤君2，陈卫忠2. 含夹层盐岩双重介质耦合损伤模型研究[J]. 岩石力学与工程学报, 2012, 31(12): 2548-2555.
JIA Shanpo1，2，YANG Jianping2，WANG Yuezhi3，TAN Xianjun2，CHEN Weizhong2. STUDY OF COUPLED DAMAGE MODEL OF DUAL MEDIA FOR SALT ROCK WITH INTERLAYER. , 2012, 31(12): 2548-2555.
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2012, Vol. 31 
