低温作用下岩石基本力学性质试验研究  

EXPERIMENTAL STUDY ON BASIC MECHANICAL BEHAVIORS OF ROCKS UNDER LOW TEMPERATURES

作　　者：徐光苗[1,2] 刘泉声[1] 彭万巍[3] 常小晓[3] 

机构地区：[1]中国科学院武汉岩土力学研究所 [2]3.中国科学院冻土工程国家重点实验室,甘肃兰州730000 [3]中国科学院冻土工程国家重点实验室

出　　处：《岩石力学与工程学报》2006年第12期2502-2508,共7页Chinese Journal of Rock Mechanics and Engineering

基　　金：国家重点基础研究发展规划(973)项目(2002CB12704)

摘　　要：以江西红砂岩和湖北页岩为代表,分别进行不同冻结温度(-20℃～20℃)和不同含水状态(饱和与干燥)下的岩石单轴压缩试验与三轴压缩试验。试验结果表明,温度在-20℃～20℃变化时,红砂岩和页岩单轴抗压强度与弹性模量都基本随温度降低而增大,但温度变化对红砂岩强度的影响大于其对页岩强度的影响,且岩石的含水状态对岩石的冻结强度影响显著。温度在-10℃～20℃变化时,2种岩石的c,?值都随温度降低而增大,但温度对红砂岩的影响大于温度对页岩的影响。通过对大量的试验数据进行分析,得到一系列有意义的拟合曲线及其关系表达式,可为研究低温及冻融循环影响的岩石基本力学性质研究提供可靠的试验依据。Basic mechanical behaviors of rocks at different temperatures and under different moisture states are required for the investigation on studying and designing rock engineering in cold regions. Two typical rocks, i.e. red sandstone and shale sampled from Jiangxi Province and Hubei Province in China, respectively, are tested by uniaxial and triaxial compressive tests at different temperatures ranging from -20 ℃ to 20℃ and in dry and fully saturated states. The test results show that, the uniaxial compressive strength and elastic moduli of these two types of rock increase with the temperature dropping between -20℃ and 20℃ in general, but the influence of temperature on red sandstone is greater than that on shale. Moreover, moisture state has the key influence on the compressive strength of rock. The cohesive strength and inner friction angle achieved by the triaxial compression tests increase with the decreasing of temperature with range of - 10 ℃ to 20 ℃, and the red sandstone exhibits larger dependence on temperature. According to these test results, some valuable curves are obtained; and relevant expressions between mechanical parameters and temperature are formulated.

关 键 词：岩石力学 寒区 冻结温度 单轴压缩试验 三轴压缩试验 力学性质 

分 类 号：TU452[建筑科学—岩土工程]