防渗墙刚度对大厚度黄土地区均质土坝除险加固效果的影响  

Impact of cutoff wall stiffness on the reinforcement effect of homogeneous earth dam in large thickness loess area

作　　者：李鹏科 辛振科 白妍丽 杨宁 LI Pengke;XIN Zhenke;BAI Yanli;YANG Ning(Water Resources and Hydropower Investigation,Design and Research Institute LLC of Gansu Province,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,兰州730000

出　　处：《水道港口》2024年第5期782-789,共8页Journal of Waterway and Harbor

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

摘　　要：目前少有防渗墙加固对坝体非线性静力特性的影响研究。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,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变形、应力、坝体剪应力水平、施工期防渗墙应力变形、加固后防渗墙变形、加固后防渗墙应力等方面的静力特性。结果表明:无论增设塑性混凝土还是刚性混凝土防渗墙,大坝渗透稳定和坝坡稳定均能满足要求,但刚性混凝土刚度不宜过大,避免产生严重裂缝。研究结果可为类似工程提供参考。At present,there are few studies on the influence of cutoff wall reinforcement on the nonlinear static characteristics of dam body.In order to study the applicability of concrete cutoff wall in removing and strengthening dangerous earth-rock DAMS in the collapsible loess area with deep overburden on the Loess Plateau,this paper takes the earth-rock dam of Bajiazui Reservoir as the engineering background.The static characteristics of dam body,such as deformation,stress,shear stress level of dam body,stress deformation of dam body during construction period,deformation of dam body after reinforcement and stress of dam body after reinforcement are studied by finite element method.The results show that whether plastic concrete is added or rigid concrete is added,the dam permeability stability and dam slope stability can meet the requirements,but the rigidity of rigid concrete should not be too large to avoid serious cracks.The results can provide reference for similar projects.

关 键 词：巴家咀水库 湿陷性黄土 土坝 塑性混凝土 防渗墙 除险加固 非线性静力分析 

分 类 号：U65[交通运输工程—港口、海岸及近海工程] TU43[交通运输工程—船舶与海洋工程]