西域砾岩边坡破坏机制及稳定分析方法  

Failure mechanism and stability analysis method of the Xiyu conglomerate slope

作　　者：王玉杰[1] 孙平[1] 李文新[2] 张强[1] WANG Yujie;SUN Ping;LI Wenxin;ZHANG Qiang(Key Laboratory on Construction and Safety of Hydraulic Engineering of Ministry of Water Resources,China Institute of Water Resources and Hydropower Research,Beijing 100038,China;Xinjiang Water Conservancy and Hydropower Investigation and Design Institute,Urumqi 830000,China)

机构地区：[1]中国水利水电科学研究院流域水循环模拟与调控国家重点实验室,水利部水工程建设与安全重点实验室,北京100038 [2]新疆水利水电勘测设计研究院,乌鲁木齐830000

出　　处：《清华大学学报（自然科学版）》2021年第8期863-872,共10页Journal of Tsinghua University(Science and Technology)

基　　金：国家重点研发计划课题(2018YFC0407003);国家自然科学青年基金项目(51809289);陕西省水利科技计划项目(2017slkj-26)。

摘　　要：针对新疆地区水利工程建设中遇到的西域砾岩边坡的破坏问题,通过现场调研和离散元数值模拟分析,研究了西域砾岩边坡特殊的变形破坏机制和特征。在此基础上,基于力和力矩平衡分析,提出了与其变形破坏机制相适应的稳定分析方法,并分析了不同掏蚀深度与裂缝深度对边坡稳定性的影响。研究结果表明,西域砾岩边坡破坏过程总体呈现"坡脚掏蚀-后缘拉裂-错落式塌落"的特点,可分为坡脚掏蚀、局部塌落、局部塌落加剧与竖直拉裂缝形成、整体塌落4个演化阶段。随着掏蚀深度或后缘拉裂缝深度的增加,边坡的倾倒安全系数也随之降低。Because the Xiyu conglomerate slope is commonly encountered in the construction of hydraulic projects in Xinjiang, its specific deformation characteristics and failure mechanism were studied through field investigation and discrete element method(DEM) numerical simulation analysis. A stability analysis method that is compatible with the deformation and failure mechanism was proposed according to force and moment balance analysis. The influence of erosion and crack depths on slope stability was analyzed. Results indicate that the failure process of the Xiyu conglomerate slope generally shows the characteristic of "slope toe erosion-tension crack at crown-staggered collapse." This can be divided into four evolutionary stages: slope toe erosion, local collapse, local collapse aggravated, and vertical tension crack formation. As the erosion or crack depth increases, the dumping safety factor of the slope decreases.

关 键 词：西域砾岩 边坡稳定 坡脚掏蚀 破坏机理 离散元方法 

分 类 号：TV61[水利工程—水利水电工程]