STUDY OF MECHANICAL PROPERTIES OF JINTAN SALT ROCK BASED ON DIRECT SHEAR TESTS
YAO Yuanfeng,YANG Chunhe,JI Wendong
(State Key Laboratory of Geomechanics and Geotechnical Engineering,Institute of Rock and Soil Mechanics,Chinese Academy of
Sciences,Wuhan,Hubei 430071,China)
Abstract:A series of direct shear tests are carried out by using testing machine RMT–150C to investigate the characteristics of salt rock in Jintan gas storage. The shear stress of dilatancy and failure characteristics are deeply analyzed by considering the salt rock as a kind of polycrystalline polymer. The results show that shear failure of salt rock is ductile failure,and the shear displacement corresponding to ultimate shear strength is generally 4–6 mm;the shear displacements of several specimens even reach 7–8 mm. The whole curves are relatively flater,the shear strength is not very clear,which is mainly due to the grain dislocation alternatively. Finally,the shear strength parameters c and is 3.16 MPa,44.7°,respectively. The residual strength and the normal stress is basically a positive correlation,and the residual strength is much higher,about 50%–80% of shear strength which indicates a strong bearing loading capacity for salt rock only by friction. Salt rock shear dilatancy occurs before the residual stress and after peak stress,and the initial stress of shear dilatancy is close to the stress for termination under much higher normal stress. Shear failure section of salt rock is not a plane but a fracture zone. It can be seen that part of the section has clear scrape which is similar to the“plow effect”. This will help to improve the shear capacity of salt rock. The results also have great reference for understanding the mechanism of Jintan salt rock and investigating the stability of underground gas storage.
姚院峰,杨春和,纪文栋. 基于直剪试验的金坛盐岩力学特性研究[J]. 岩石力学与工程学报, 2011, 30(S1): 2690-2696.
YAO Yuanfeng,YANG Chunhe,JI Wendong. STUDY OF MECHANICAL PROPERTIES OF JINTAN SALT ROCK BASED ON DIRECT SHEAR TESTS. , 2011, 30(S1): 2690-2696.
杨春和,梁卫国,魏东吼,等. 中国盐岩能源地下储存可行性研究[J]. 岩石力学与工程学报,2005,24(24):4 409-4 417.(YANG Chunhe,LIANG Weiguo,WEI Donghou,et al. Investigation on possibility of energy storage in salt rock in China[J]. Chinese Journal of Rock Mechanics and Engineering,2005,24(24):4 409-4 417.(in Chinese))
Your browse does not support frame!