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| EXPERIMENTAL STUDY OF MECHANICAL PROPERTY OF TWO TYPES OF SEDIMENTARY SALT ROCK WITH INTERFACE |
| YAO Yuanfeng，YANG Chunhe，JI Wendong，MA Hongling，ZONG Xianlei |
(State Key Laboratory of Geomechanics and Geotechnical Engineering，Institute of Rock and Soil Mechanics，Chinese Academy of
Sciences，Wuhan，Hubei 430071，China) |
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Abstract Jintan bedded salt rock caused by mechanical and chemical deposition actions is structured under shallow lacustrine-lagoon facies-evaporite rock facies geological environments. However，Qianjiang bedded salt rock，whose lake basin environment is perennial deep water bedded salt lake，is formed by mechanical deposition action under the deep-water lake，oxygen lack and calm water environments. So，the interfaces between these two types of salt rocks are different. According to the characteristics of interfaces between Jintan and Qianjiang salt rocks，the uniaxial compression tests，shear tests and triaxial compression texts are carried out to investigate the interfaces of typical Jintan and Qianjiang salt rock specimens；and the complete stress-strain curves and their mechanical significations are deeply analyzed. Simultaneously，the specimens failure characteristics are also investigated. It is shown that：(1) Both of the two kinds of salt rock specimens present good ductility and the collapse failures don′t occur. (2) The cracks are generated mainly around the interfaces. The interface of Qianjiang salt rock plays a prominent role in limiting the deformation of the samples compared with the Jintan′s. (3) The peak shear stresses of both interface salt rocks are almost equal to the pure salt rock′s，which indicates that the shear failure of interface salt rocks is decided by the mechanical behavior of pure salt rock. The results could provide some references for selection and construction of gas storages.
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Received: 08 July 2011
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2012, Vol. 31 
