坝基二维渗流场的大尺寸物理模型试验  

Large-sized physical model of two-dimensional dam seepage field

作　　者：李鹏飞[1] 徐佩华[1] 韩婧[1] 吕晋志 

机构地区：[1]吉林大学建设工程学院,长春130026

出　　处：《世界地质》2016年第2期559-566,共8页World Geology

基　　金：国家自然科学基金青年基金项目(41302218)资助

摘　　要：利用大尺寸砂槽试验模型模拟了坝基二维渗流全过程,并着重分析了坝基二维渗流场的变化情况。模型槽内土样渗透变形破坏后,取不同区域土样进行颗粒分析试验。根据渗透变形试验所获得的参数,运用GeoStudio 2007软件对坝基渗流场进行数值分析,所得渗流场分布与物理模型试验结果基本吻合,说明该二维渗流场的物理模型试验结果较为合理。结果表明,渗透破坏主要发生在坝体下渗透路径较短的区域内,而坝基上下游基本未产生渗透变形;产生渗透破坏后,渗流路径发生较大改变,导致渗透破坏区域渗流量大幅增加,加速坝基破坏进程。Experiments were conducted in large scale sand tank to simulate the two-dimensional seepage process through large sand grain in dam foundation to analyze the variations of the seepage situation. Soil samples in different location were taken out to analyze their particles＇ composition after seepage failure. Based on the parameters obtained from the experiments,numerical analysis is conducted to simulate the seepage field using the software of GeoStudio 2007 whose results of the spatial distribution of the seepage field agreed well with those from experiments,indicating the reasonable of the experimental model. Results showed that seepage deformation mainly occurred in dam foundation where the seepage path was short while there were no clear deformation along the upstream and downstream of the dam foundation. The seepage path changed greatly after seepage failure leading to the great increase of the volume of seepage flow,thus accelerating the damage process.

关 键 词：渗流场 砂槽 坝基 渗透破坏 

分 类 号：TV139.16[水利工程—水力学及河流动力学] TV543.8