一种在覆盖层上建造拱坝新措施的可靠性分析  

Reliability Analysis of a New Method for Constructing Arch Dam on Overburden

作　　者：陈玉琳 毛海涛[1,2] 侍克斌 王晓菊[2] 王璠 CHEN Yu-lin;MAO Hai-tao;SHI Ke-bin;WANG Xiao-ju;WANG Fan(School of Water Conservancy and Civil Engineering,Xinjiang Agricultural University,Urumqi 830052,China;School of Chemistry and Environmental Engineering,Chongqing Three Gorges University,Wanzhou 404100,China)

机构地区：[1]新疆农业大学水利与土木工程学院,乌鲁木齐830052 [2]重庆三峡学院化学与环境工程学院,万州404100

出　　处：《科学技术与工程》2021年第10期4196-4204,共9页Science Technology and Engineering

基　　金：国家自然科学基金(531892619)。

摘　　要：针对中国山区河道中小型拱坝在不开挖覆盖层下坝基渗透变形问题,以金盆电站拱坝为例,采用三道防渗墙联合高压旋喷灌浆的措施进行基础处理。运用Comsol Multiphysics数值模拟方法,对拱坝的坝体和底部防渗墙进行三维有限元应力研究。结果表明:在各种控制工况下,坝体及坝基防渗墙在上、下游面最大拉应力分别为0.6、0.55 MPa,最大压应力分别为5.0、7.0 MPa,应力分布均在合理范围0.8~8.0 MPa以内。将该措施下的大坝位移情况与观测数据分析对比,得出位移耦合模拟结果与实测数据坝顶测点LD1-LD2、坝底LD3-LD4二者的水平位移相对误差仅为(5.9%,8.0%)、(5.8%,6.0%);垂直位移相对误差仅为(5.9%,5.8%)、(6.3%,5.8%),各时段坝体变形数值大小均在允许误差10.0%以内,分布规律满足要求,在该措施下大坝处于安全可控。Aiming at the problem of seepage deformation of dam foundation under no excavation overburden for small and medium-sized arch dams in mountainous areas in China, taking the arch dam of Jinpen Hydropower Station as an example, three diaphragm walls combined with high-pressure whirl-spray grouting were adopted for basic treatment. Using the Comsol Multiphysics numerical simulation method, the three-dimensional finite element stresses on the dam body and the diaphragm wall at the bottom of arch dam were studied. Results show that under various control conditions, the maximum principal tensile stresses of the dam body and the diaphragm wall of the dam foundation were 0.6 MPa and 0.55 MPa, respectively, on the upper and downstream sides, and the maximum principal compressive stresses were 5.0 MPa and 7.0 MPa, respectively. The stress distribution was the reasonable range of 0.8~8.0 MPa, under which the displacement of the dam with the observed data were analyzed and compared. Results show that the relative errors of horizontal displacement of the displacement coupling simulation results and the measured data LD1-LD2 at the dam top and LD3-LD4 at the dam bottom were only(5.9%, 8.0%) and(5.8%, 6.0%), and the relative errors of vertical displacement were only(5.9%, 5.8%) and(6.3%, 5.8%), respectively. The deformation value of the dam body in each period was within the allowable error of 10.0%, and the distribution law could meet the requirements, under which the dam is currently in safe and controllable state.

关 键 词：坝基处理 Comsol Multiphysics数值模拟 应力分析 位移 观测分析 

分 类 号：TV64[水利工程—水利水电工程]