镶嵌-碎裂结构建基接触面抗剪强度试验研究  

Experimental study on shear strength of foundation interface with inlaying-fragmentation structure

作　　者：李刚[1,2] 魏伟[1] 张勇[3] 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 [2]成都理工大学科技咨询部,四川成都610059 [3]四川大学水利水电学院,四川成都610065

出　　处：《人民长江》2012年第5期68-71,共4页Yangtze River

基　　金：国家自然科学基金项目(40372127)

摘　　要：金沙江某水电站第23、24坝段,在开挖至建基面时,仍存在一定深度、一定范围质量较差的Ⅲ-Ⅳ类镶嵌-碎裂结构岩体,由于此类岩体影响着大坝的抗滑稳定性,因此,在现场通过原位大剪试验,对原位镶嵌-碎裂结构岩体与混凝土接触面抗剪(断)强度进行了试验,并运用优定斜率法确定了接触面的抗剪(断)强度的标准值。试验表明:镶嵌-碎裂结构岩体在原位状态下仍具有一定的力学性能;原位镶嵌-碎裂结构岩体与混凝土接触面具有较高的凝聚力C和摩擦阻力f,且都达到了Ⅲ类岩体的标准;接触面的抗剪断强度仍然是大坝抗滑稳定的控制边界。At the foundation surface of No. 23 and No. 24 dam sections of a hydropower station on Jinsha River, there is class III- IV rock mass characterized by inlaying fragmentation structure with a certain depth and poor quality. Because the rock mass influences the stability against sliding of the dam, the shear strength of the contact interface between rock mass with inlaying fragmentation structure and the concrete are tested through in - situ shear test. The standard values of the interface shear strength are identified by predominant slope method. The tests indicate that the rock mass with inlaying fragmentation structure still has certain mechanical properties under in -situ conditions; the rock mass of inlaying fragmentation structure and the concrete contact surface have large cohesion and frictional resistance, meeting the standard of class III rock ; the shear strength of contact surface is still the control boundary of stability against sliding of dam.

关 键 词：镶嵌-碎裂结构岩体 原位直剪试验 抗剪(断)强度 接触面 优定斜率法 

分 类 号：TU459.2[建筑科学—岩土工程]