水力枢纽高边坡支护技术研究与抗震稳定性分析  

Supporting Technology Research and Seismic Stability Analysis on High Slope of Lechangxia Hydro Conservancy Project

作　　者：李吉蓉 LI Jirong(Qinghai Zhengxin Water Conservancy and Hydropower Design Co.,Ltd.,Xining 810001,China)

机构地区：[1]青海正鑫水利水电设计有限公司,青海西宁810001

出　　处：《甘肃科学学报》2023年第3期134-139,共6页Journal of Gansu Sciences

摘　　要：高边坡安全稳定控制是水利枢纽工程建设需要解决的一大问题,为研究水力枢纽高边坡的合理支护技术,以乐昌峡水利枢纽工程高边坡为研究背景,首先对其无支护状态下的稳定性展开数值模拟,找出其薄弱部位;再针对不同的边坡台阶提出了不同的支护加固措施,得到了支护后边坡的变形稳定特征;最后开展了水利枢纽高边坡的抗震稳定性分析。研究结果表明:(1)在无支护条件下,水利枢纽边坡的最大位移达到600 mm,无降雨状态下安全稳定系数仅为1.03,低于规范要求;(2)对高边坡采用“铁丝网客土喷播草籽+格构梁+钢筋锚杆”支护后,降雨状态下水利枢纽边坡的整体安全稳定系数仍保持在1.258,满足规范要求;(3)7级地震荷载作用下边坡的整体稳定系数变为1.136,高于规范中偶然工况稳定设计安全系数值1.05~1.10。The safety and stability control of high slopes is a major problem that needs to be solved in the construction of hydro conservancy projects.In order to study the reasonable support technology for high slopes of hydraulic projects,taking the high slopes of Lechangxia Hydro Conservancy Project as the research background,first of all,a numerical simulation research was carried out on the stability under the support state,and the weak parts were found out.On this basis,different support and reinforcement measures were proposed for different slope steps,and the deformation and stability characteristics of the slope after support were obtained.In addition,the seismic stability analysis of the high slope of the hydro conservancy project was carried out.The results show that:(1)under the condition of no support,the maximum displacement of slope of hydraulic project reaches 600 mm,and the safety and stability coefficient is only 1.03 under the condition of no rainfall,which is lower than the specification requirements.(2)After the high slope is supported by barbed wire and soil spraying grass seeds+lattice beam+steel anchor rod,the overall safety and stability coefficient of slope of hydro conservancy project remains at 1.258 under the condition of rainfall,which meets the requirements of the code.(3)The overall stability coefficient of slope under M7 earthquake load becomes 1.136,which is higher than the safety coefficient value of stability design under occasional condition in the code from 1.05 to 1.10.

关 键 词：水利枢纽 高边坡 位移 抗震 安全稳定系数 

分 类 号：U213.13[交通运输工程—道路与铁道工程] TV61[水利工程—水利水电工程]