拉哇水电站地下厂房围岩稳定分析  

Stability Analysis of Surrounding Rock in the Underground Powerhouse of Lawa Hydropower Station

作　　者：任少龙 郑林娜 REN Shaolong;ZHENG Linna(PowerChina Zhongnan Engineering Corporation Limited, Changsha 410014, Hunan, China;College of Water Conservancy and Hydropower Electricity, Hohai University, Nanjing 210098, Jiangsu, China)

机构地区：[1]中国电建集团中南勘测设计研究院有限公司,湖南长沙410014 [2]河海大学水利水电学院,江苏南京210098

出　　处：《水力发电》2019年第8期71-75,共5页Water Power

摘　　要：大型地下洞室群结构及地质条件复杂,其围岩稳定性受施工方法、支护方式及围岩自身等多方面因素影响。以拉哇水电站地下厂房为研究对象,采用三维非线性有限元法进行数值模拟分析,研究其在开挖过程中围岩位移、应力及塑性区的变形规律,分析其围岩稳定性能,为工程开挖及支护提供科学依据。结果表明:拉哇水电站围岩变形最大位移达74.44mm,拉、压应力最大值分别达1.06MPa和23.14MPa,主厂房顶拱、边墙及洞室交叉部位区域稳定性较低,在实际施工中,应加强监控并适当调整支护方案。As complex structure and geological conditions of large underground caverns, the stability of surrounding rock is affected by construction method, supporting method and surrounding rock itself. Taking the underground powerhouse of Lawa Hydropower Station as research object, three-dimensional non-linear finite element method is used to carry out numerical simulation analysis. The displacement, stress and deformation law of plastic zone of surrounding rock during excavation are studied, and the stability performance of surrounding rock is analyzed, which provides scientific basis for engineering excavation and supporting. The results show that the maximum displacement of surrounding rock deformation of Lawa Hydropower Station is 74.44 mm, the maximum tensile stress and compressive stress are 1.06 MPa and 23.14 MPa respectively, and the local stability of top arch, side wall and intersecting part of cavern of main powerhouse is lower. In actual construction, the monitoring and supporting scheme should be strengthened and adjusted appropriately.

关 键 词：地下厂房 围岩稳定分析 地下洞室群 围岩变形 拉哇水电站 

分 类 号：TV731.6[水利工程—水利水电工程] TV271