复杂岩性条件下岩体变形模量试验与取值方法  

Test and determination for rock deformation modulus in complex lithology condition

作　　者：李刚[1] 陈强[1] 聂德新[1] 赵其华[1] 

机构地区：[1]成都理工大学地质灾害防治与地质环境保护国家重点实验室,四川成都610059

出　　处：《人民长江》2013年第23期48-51,共4页Yangtze River

基　　金：高等学校博士学科点专项科研基金博导类联合资助课题(20125122110005)

摘　　要：对于岩性、岩相变化大的重力坝坝基,因其原位变形试验的岩体变形模量差异大,致使变形模量取值较困难。以某水电站坝基为研究对象,在现场对软硬相间岩层和单一岩性的岩体分别开展了综合岩性大型变形试验和自载式原位变形试验,其中综合岩性大型变形试验同时覆盖了砂岩、粉砂岩和泥质岩等各类岩体。试验结果表明:综合岩性大型试验的变形模量与所涵盖各类岩体的变形模量大小及所占比例有较强相关性;相同岩性岩体不同位置及不同岩层变形模量存在差异,在获取综合变形模量值时应尽量选取相同岩层且相近范围内的变形模量值。For gravity dam foundation that is characterized by different lithology and lithofacies, the determination of deforma- tion modulus is difficult due to different deformation modulus obtained by in - situ deformation test. We carried out a comprehen- sive lithology large - scaled deformation test and a self - loading deformation test respectively for hard - soft alternative rock and single lithology rock of a hydropower station foundation. For the former test, the load bearing plate could cover sandstone, silt- stone and mudstone in the foundation area simultaneously. The test results show that the values of deformation modulus obtained by the comprehensive lithology large -scaled deformation test is closely dependent on different rock covered by the bearing plate as well as their contribution ; differences of rock modulus in the same lithology are found in various location and various rock layer, so we should calculate comprehensive rock modulus by selecting modulus in adjacent areas of the same rock layer.

关 键 词：综合岩性大型变形试验 自载式变形试验 变形模量 综合变形模量 加权平均 

分 类 号：TU459.2[建筑科学—岩土工程]