巴家咀水库混凝土防渗墙加固对坝体渗流特性的影响  

Impact of the concrete anti-seepage wall reinforcement on the seepage characteristics of the dam body in Bajiazui Reservoir

作　　者：白妍丽 辛振科 李鹏科 BAI Yanli;XIN Zhenke;LI Pengke(Gansu Water Resources and Hydropower Survey and Design Research Institute Co.,Ltd.,Lanzhou 730000,China)

机构地区：[1]甘肃省水利水电勘测设计研究院有限责任公司,甘肃兰州730000

出　　处：《水利建设与管理》2024年第5期50-55,共6页Water Conservancy Construction and Management

基　　金：甘肃省水利科学试验研究与技术推广计划(23GSLK066、23GSLK067)。

摘　　要：目前少有防渗墙加固对坝体渗流特性的影响研究,湿陷性黄土地区病险土石坝采用混凝土防渗墙除险加固的报道更是鲜有。为了研究混凝土防渗墙在黄土高原深厚覆盖层湿陷性黄土地区病险土石坝除险加固中的适用性及防渗阻渗效果,本文以巴家咀水库土石坝为工程背景,采用有限元方法研究了上游马道处增设防渗墙后坝体的渗流特性,分析了防渗墙加固前后坝体浸润线高度、渗流量、渗透坡降等渗流特性。结果表明:与加固前相比,增设混凝土防渗墙后,河床断面浸润线高度显著降低,土石料渗透系数越大,降低程度越明显;防渗墙加固后坝体单宽渗流量有大幅度减小,最大减小幅度达64.2%,减小幅度随水库水位降低而增大;渗透系数越大,防渗墙加固后坝体单宽流量减小幅度越大,防渗墙控制坝体渗流量的效果越显著;防渗墙加固后坝体渗透坡降减小幅度随渗透系数减小而增大,渗透系数较小时,防渗墙加固对坝体渗透坡降的影响较为明显。增设防渗墙对坝体渗透稳定性起到了很好的提升效果,研究结果可为大厚度黄土地区土石坝除险加固及类似工程提供参考。There are currently few studies on the impact of anti-seepage wall reinforcement on the seepage characteristics of dam bodies,and reports are even rarer on the use of concrete anti-seepage walls for the reinforcement and hazard removal of risky earth and rockfill dams in collapsible loess areas.To investigate the applicability and anti-seepage effect of concrete anti-seepage walls in reinforcing risky earth and rockfill dams in the deep cover layers of the Loess Plateau,this paper,using Bajiazui Reservoir earth and rockfill dam as an engineering background,employs the finite element method to study the dam’s seepage characteristics after the installation of an anti-seepage wall at the upstream horse path.It analyzes the seepage characteristics such as the dam’s phreatic line height,seepage quantity,and seepage slope after reinforcement.The results show that compared to before reinforcement,the installation of a concrete anti-seepage wall significantly lowers the riverbed section’s phreatic line height;the greater the permeability coefficient of the earth and stone material,the more significant the reduction.After the wall reinforcement,the single-width seepage quantity of the dam body decreases significantly,with a maximum reduction of 64.2%,and this reduction increases as the reservoir water level lowers.The greater the permeability coefficient,the larger the reduction in single-width flow after wall reinforcement,making the wall more effective in controlling the dam body’s seepage quantity.The reduction in seepage slope after wall reinforcement increases as the permeability coefficient decreases,and when the coefficient is low,the wall’s impact on the dam body’s seepage slope is more pronounced.The addition of an anti-seepage wall greatly enhances the dam body’s permeation stability.These results can provide a reference for the reinforcement and hazard removal of earth and rockfill dams in thick loess areas and similar projects.

关 键 词：巴家咀水库 混凝土防渗墙 除险加固 渗流特性 

分 类 号：TV52[水利工程—水利水电工程]