基于参数反演与耦合作用的高堆石坝垫层对坝体渗流影响仿真  

Influence of high rockfill dam cushion on dam seepage based on parameter inversion and coupling effect

作　　者：李梁[1,2] 周伟[1,2] 刘杏红[2,3] 白帆[1,2] 常晓林[1,2] 

机构地区：[1]武汉大学水资源与水电工程科学国家重点实验室,湖北武汉430072 [2]武汉大学水工岩石力学教育部重点实验室,湖北武汉430072 [3]武汉大学土木建筑工程学院,湖北武汉430072

出　　处：《武汉大学学报（工学版）》2015年第1期39-44,53,共7页Engineering Journal of Wuhan University

基　　金：国家973计划项目(编号:2013BC035900);国家自然科学基金优秀青年科学基金项目(编号:51322905)

摘　　要：通过研究混凝土垫层对高堆石坝渗流场的影响,旨在通过仿真模拟过程提出一种切实可行的分析方法,较准确地计算运行期坝体渗流量.结合糯扎渡心墙堆石坝工程实例,运用改进后的粒群算法对垫层混凝土热学参数进行反演并计算垫层温度场,模拟垫层上部土石料填筑过程,并考虑蓄水后水压力对垫层作用确定运行期垫层应力状态.参考垫层应力计算结果及实测资料预测垫层可能产生裂缝区域,利用立方定律研究垫层渗透系数变化对坝体渗流的影响;选取大坝典型剖面,以修改后的邓肯-张模型为基础并运用土体渗流耦合原理重新计算坝体渗流场及应力场.数值仿真计算结果表明:正确认识运行期垫层应力状态及渗透性质变化对准确模拟计算坝体渗流场具有较大意义.By studying the effects of concrete cushion for high rockfill dam seepage field, a feasible analysis method for accurate calculating dam seepage discharge in the stage of operation is put forward. Combining with the example of Nuozhadu Hydropower Project, using cushion inversion parameters based on the im- proved particle swarm optimization to simulating cushion stress field and simulating soil and rock filling process, considereding dam impoundment process, the cushion stress state is defermined. According to simulation results of cushion stress and the dam measured data to predict cushion crack area, and then u- sing the cubic law the relationship between cushion osmotic coefficient and dam seepage discharge is stud- ied. Choosing typical dam section, based on modified Duncan-Chang model and fluid-solid coupling theory, the dam seepage field and stress field are recalculated. Numerical simulation results show that correctly understanding concrete cushion stress state and permeability changes is significance for accurate calculating dam seepage discharge.

关 键 词：高堆石坝 混凝土垫层 粒群算法 应力场 渗流场 渗流量 

分 类 号：TV315[水利工程—水工结构工程]