杨房沟水电站左岸坝肩边坡断层f_(37)变形机制及其加固设计  

Deformation Mechanism and Reinforcement Design of Fault f_(37) on Left Abutment Slope of Yangfanggou Hydropower Station

作　　者：李锦成 殷亮 LI Jincheng;YIN Liang(Yalong River Hydropower Development Co.,LTD,Chengdu,Sichuan,610000;PowerChina Huadong Engineering Corporation Limited,Hangzhou,Zhejiang,311122)

机构地区：[1]雅砻江流域水电开发有限公司,四川成都610000 [2]中国电建集团华东勘测设计研究院有限公司,浙江杭州311122

出　　处：《四川水力发电》2021年第3期98-104,共7页Sichuan Hydropower

摘　　要：杨房沟水电站坝址区边坡高陡、结构面发育,边坡变形破坏方式复杂、多样。左岸缆机平台以下边坡开挖受不利断层f 37影响,出现了局部变形开裂现象,对施工安全与边坡稳定影响较大。笔者结合现场地质调查和监测成果,采用三维块体离散元方法,深入分析了在断层f 37影响下边坡的变形机制及稳定性特征,边坡发生局部变形开裂的主要原因是断层f 37与坡体在不利的空间关系下,开挖卸荷作用导致断层f 37上、下盘岩体出现了非连续变形特征和卸荷松弛现象。在针对性加固处理方案实施后,边坡处于整体稳定状态,表明加固设计方案合理可行。In the dam site area of Yangfanggou Hydropower Station,the slope is high and steep,the structural plane is developed,and the deformation and failure modes of the slope are complex and diverse.During excavation of the slope below the cable crane platform on the left bank,affected by the unfavorable fault f37,local deformation and cracking occurred,which has a great impact on the construction safety and slope stability.Based on the field geological survey and monitoring results,this paper analyzes the deformation mechanism and stability characteristics of the slope under the influence of fault f37 by using three-dimensional block discrete element method.The main reason for the local deformation and cracking of the slope is that under the unfavorable spatial relationship between fault f37 and slope,the excavation unloading action leads to the discontinuous deformation and unloading characteristics of the rock mass in the upper and lower walls of fault f37 pelaxation phenomenon.After implementation of the targeted reinforcement scheme,the slope is in an overall stable state,which shows that the reinforcement design scheme is reasonable and feasible.

关 键 词：杨房沟水电站 岩石高边坡 变形机制 离散单元法 稳定性 

分 类 号：TV74[水利工程—水利水电工程] U213.13[交通运输工程—道路与铁道工程]