巴塘水电站泄洪洞导流洞进口边坡稳定分析  

Analysis on Stability of Slope at the Intake of Flood-Discharge Tunnel and Diversion Tunnel of Batang Hydropower Station

作　　者：吕庆超 朱颖儒 齐景瑞 李渤 LV Qingchao;ZHU Yingru;QI Jingrui;LI Bo(PowerChina Northwest Engineering Corporation Limited, Xi'an, Shaanxi, 710065)

机构地区：[1]中国电建集团西北勘测设计研究院有限公司,陕西西安710065

出　　处：《四川水力发电》2021年第4期83-86,90,共5页Sichuan Hydropower

摘　　要：巴塘水电站泄洪洞导流洞进口边坡处于金沙江峡谷与巴楚河切割形成的三面临空山梁地带,岩体卸荷、风化发育,工程边坡开挖高度超过100 m,再加上底部跨度均超过20 m的泄洪洞和导流洞开挖,边坡稳定问题突出。为此,采用刚体极限平衡法对工程边坡抗滑稳定进行分析,并按照设计标准制定支护处理方案,同时,又采用三维非线性有限元法对边坡及洞室开挖过程中的变形稳定进行分析,结果表明,现有支护方案可使边坡满足稳定要求。目前,该边坡及下部洞室开挖已基本完成,整体变形稳定,达成预期截流目标。The intake slope of the flood-discharge and diversion tunnel of Batang Hydropower Station is located at a three-sided free ridge formed by the Jinsha River Gorge and the Bachu River,which results in unloading and weathering of the rock mass.Excavation height of the slope exceeds 100m and the excavation span of the flood-discharge tunnel and diversion tunnel on the bottom all exceed 20 m,so stability of the slope becomes a critical issue.Based on the rigid body limit equilibrium method,anti-sliding stability of the slope is analyzed in this paper,a supporting scheme according to the design standard is proposed.Subsequently,deformation stability of the slope and tunnel during excavation is analyzed based on three-dimensional non-linear finite element method.The results show that the supporting scheme can meet stability requirements of the slope.At present,the excavation of the slope and tunnels has been basically completed,the overall deformation is stable,and the expected river closure goal is achieved.

关 键 词：边坡工程 非线性有限元法 极限平衡法 变形稳定 

分 类 号：TM622[电气工程—电力系统及自动化] TV551.12[水利工程—水利水电工程]