摘要
通过不同温度(25℃～70℃)和围压(0～60 MPa)及孔隙水压力(0～10 MPa)和围压(25～60 MPa)条件下的耦合三轴试验,研究了南水北调西线一期工程砂岩的强度特性和变形特性。试验结果显示,相同温度下,三轴压缩时砂岩的强度随围压增加而增长,而变形模量随围压的增长变化不大;温度对其强度的影响比较复杂,在低围压(0～40 MPa)下,岩石的强度随温度增长,围压超过40 MPa后,强度随温度的增长有降低的趋势。平均变形模量对温度的依赖性较大,总体上随着温度增加其值得到提高。相同孔隙水压力作用下,砂岩的强度受围压控制,表现为围压越大,岩石的强度越高;相同围压条件下,孔隙水压力越高,岩石强度越低。在孔隙水压力作用下,围压越高,平均变形模量越高;在围压作用下,孔隙水压力越高,变形模量越低。
Based on the condition of the west route of South-to-North Water Transfer Project in China, the triaxial compression tests under confining pressures （from 0 to 60 MPa） coupled with temperatures （form 20 ℃ to 70 ℃） as well as confining pressures （from 25 to 60 MPa） coupled with pore water pressure （from 0 to 10 MPa）have been conducted on sandstone specimens. The results show that, at the same temperature, the strength of the rock increases with the confining pressure; but the deformation modulus doesn＇t change distinctly with confining pressures. The influence of temperature on the strength and deformation properties is complex. The strength increases with the temperature when the confining pressure is lower than 40 MPa; whereas, when the confining pressure is greater than 40 MPa, the strength tends to decrease with the increasing temperature. It is also indicated that the deformation moduli＇ generally increase with the increasing temperature. Under the condition of pore water pressure, it is shown that the strength of the rock increases with increasing of confining pressure and pore water pressure, and the deformation moduli of the rock increase with the increasing confining pressure and decrease with the increasing pore pressure.
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2005年第20期3639-3645,共7页
Chinese Journal of Rock Mechanics and Engineering
基金
国家自然科学基金委员会和中国长江三峡工程开发总公司联合资助项目(50439030)
国家重点基础研究发展规划(973)项目(2002CB412705)
关键词
岩石力学
砂岩
温度
围压
孔隙水压力
强度和变形特性
rock mechanics
sandstone
temperature
confining pressure
pore water pressure
strength and deformation properties
