宜兴抽水蓄能电站上库主坝重力挡墙位移影响因素分析  

Analysis of influence factors on gravity retaining wall displacement of main dam for the upper-reservoir of Yixing Pumped-Storage Hydropower Station

作　　者：王柳江[1,2] 赵志杰 刘斯宏 鲁洋[1,2] 沈超敏 WANG Liujiang;ZHAO Zhijie;LIU Sihong;LU Yang;SHEN Chaomin(College of Water Conservancy and Hydropower Engineering,Hohai University,Nanjing 210098,China;International Joint Laboratory of Long-Term Behaviour&Environmentally Friendly Rehabilitation Technologies on Dams,Nanjing 210098,China)

机构地区：[1]河海大学水利水电学院,江苏南京210098 [2]大坝长效特性及环保修复技术中西联合实验室,江苏南京210098

出　　处：《河海大学学报（自然科学版）》2021年第4期358-365,共8页Journal of Hohai University(Natural Sciences)

基　　金：国家自然科学基金雅砻江重点项目(U1765205);中央高校基本科研业务费专项(2019B11214)。

摘　　要：利用宜兴抽水蓄能电站上库主坝重力挡墙的位移观测资料,初步分析了挡墙位移变化规律及其影响因素;基于温度应力计算原理,采用沈珠江流变模型和改进的湿化模型(C_(w)-D_(w))对坝体和挡墙应力变形进行数值模拟。结果表明:墙后坝体堆石流变、湿化以及环境温度变化是影响运行期挡墙位移的主要因素;坝体运行初期挡墙往上游侧偏移,这主要与墙后堆石体偏应力流变量相对较大有关;降雨入渗造成堆石湿化变形,导致挡墙往坝体下游侧的水平位移显著增大;挡墙位移的周期性变化与环境温度相关;墙顶位移、墙后土压力的监测值和计算值基本一致,证明了该数值计算方法的有效性。In this work,by utilizing the monitoring data of a gravity retaining wall in the upper-reservoir of Yixing Pumped-Storage Hydropower Station,the variations of retaining wall displacement and their influence factors were studied.After that,a numerical simulation was conducted to investigate the displacements of rockfill dam and retaining wall with the consideration of the coupled effect of temperature.Here,the rheological model and wetting model(C_(w)-D_(w))proposed by Shen were used to model the rheological deformation and wetting deformation of rockfill materials.The results show that the rheological deformation,wetting deformation,and environmental temperature are three main influence factors for the displacement of retaining wall in the operation period.In the early stage of dam operation,there was a displacement for the retaining wall occurred towards upstream,which was mainly attributed to the relatively larger rheological deviator strain for rockfill materials near this place.The wetting deformation of rockfill materials was caused by rainfall infiltration and led to the increase of displacement of retaining wall towards downstream.The cycling variations of displacement were related to the environmental temperature.In addition,the calculated displacement and earth pressure agreed well with measured values,which indicates that the numerical method used in this study was effective.

关 键 词：重力挡墙 位移 土压力 流变 湿化变形 温度应力 宜兴抽水蓄能电站 

分 类 号：TV743[水利工程—水利水电工程] TV223