复杂地质条件下拱坝坝肩滑动块体稳定性地质力学模型试验  

Geomechanical Model Experiment of Arch Dam Abutment Sliding Block Stability under Complex Geological Conditions

作　　者：汪罗 张林[1,2] 陈媛[1,2] 陈建叶[1,2] 杨宝全[1,2] 

机构地区：[1]四川大学水力学与山区河流开发保护国家重点实验室,四川成都610065 [2]四川大学水利水电学院,四川成都610065

出　　处：《水电能源科学》2015年第12期74-77,共4页Water Resources and Power

基　　金：国家自然科学基金项目(51379139;51409179);国家自然科学基金青年基金项目(51109152)

摘　　要：拱坝坝肩岩体在断层、裂隙、层间剪切带等地质缺陷的作用下形成了不同规模的滑动块体,从而削弱了坝肩岩体的完整性,降低了坝肩岩体的承载能力,影响坝肩的稳定安全。为了分析坝肩滑动块体稳定性,以立洲拱坝工程为例,采用地质力学模型试验,分析两坝肩的地质构造及主要软弱结构面的产状发现,两坝肩存在四种潜在的滑动块体。在此基础上,通过地质力学模型超载法对坝肩岩体进行破坏试验,得到了滑动块体的失稳破坏机理、破坏形态及影响滑动块体稳定的控制因素,为解决类似工程问题提供了参考。The arch dam abutment rock formed different size sliding blocks at the action of geological defect, such as faults, fractures, interlayer shear zone etc. The integrity of abutment rock was weakened and its bearing capacity was reduced. So, it had impact on the dam abutment＇s stability and safety. In order to analyze the abutment sliding block stability safety, taking Lizhou areh dam project as an example, geomechanies model test was used to research the dam abutment sliding block stability. Based on the analysis of two dam abutments＇ geological structure and the main weak structure surface, it shows that the two dam abutment have four kinds of potential sliding block. Through the destruction test of abutment rock mass with overload method based geomechanics model, the article got the sliding block failure mechanism and failure shape and the controlling factors for influencing sliding block stability. The research achievements can provide a reference for solving similar project problem.

关 键 词：拱坝坝肩 滑动块体 地质力学模型超载法 软弱结构面 块体稳定安全系数 

分 类 号：TV321[水利工程—水工结构工程] TU443[建筑科学—岩土工程]