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| PHYSICAL SIMULATION OF DEFORMATION AND FAILURE MECHANISM OF SOFT AND HARD INTERBEDDED SALT ROCKS |
| ZHANG Guimin1，LI Yinping1，YANG Changlai2，LIU Wei1，SHI Xilin1，YANG Chunhe1 |
| (1. State Key Laboratory of Geomechanics and Geotechnical Engineering，Institute of Rock and Soil Mechanics，Chinese Academy of Sciences，Wuhan，Hubei 430071，China；2. Jintan Gas Storage Project Department，Sichuan-to-East Natural Gas Transmission Pipeline Branch Company of SINOPEC，Jintan，Jiangsu 213200，China) |
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Abstract Considering the geological formation characteristics of salt mines in China，a series of physical simulation experiments were carried out to simulate the soft and hard interbedded salt rocks. The influences of dip angle，interlayers and interfaces on the deformation and failure mechanism of soft and hard interbedded salt rocks were discussed. The test results and theoretical analysis show that：(1) As the dip angle changes，the uniaxial compressive strength curve of soft and hard interbedded salt rocks presents U-shape. (2) When the dip angle θ＜30°，the failure mode is structural failure dominantly controlled by the hard interlayers；when 45°＜θ＜75°，the failure mode is shear or sliding failure dominantly controlled by weak interlayers or weak interfaces；when 85°＜θ＜90°，the failure mode is splitting failure at hard layers or partial shear failure at weak layers. (3) Shear or sliding failure along weak interlayers or weak interfaces is the internal cause that the uniaxial compressive strength curve of soft and hard interbedded salt rocks shows U-shape. Therefore，when setting the range of internal pressures，more attention should be paid to the shear strength of weak interlayers and weak interfaces，in particular those at the haunches of storages，to prevent these interlayers and interfaces from being damaged and to avoid potential leakage of gas.
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Received: 27 April 2012
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2012, Vol. 31 
