摘要
为了解复合土工膜防渗高土石坝围堰的结构特性,基于对高土石围堰的填筑过程和土工膜力学、渗流特性的模拟,结合某土工膜防渗高土石围堰工程,分析了围堰施工—运行过程中土工膜与混凝土防渗墙的运行状态。结果表明,在高土石围堰施工—运行过程中,土工膜水平铺设段与底部台阶铺设段相接处为易损区域;土工膜破坏后,膜后堰体浸润线明显抬高,渗漏量成倍增加,对堰体稳定造成不利影响,可在有较大概率破损的部位采取增设局部加强抗渗垫层及加厚过渡料区等措施保障安全。
In order to explore the structural features of composite geomembrane high rockfill cofferdam,based on the simulation of high rockfill cofferdam filling process and geomembrane features,the safety state of anti-seepage system of a composite geomembrane rockfill cofferdam was analyzed.The results show that the joint part of horizontal section and step bottom section is the vulnerable region of geomembrane;when the geomembrane is damaged,the saturation line after geomembrane rises obviously and the leakage amount increases in multiples,which will cause negative effect on the safety of the cofferdam.So,local impervious cushion should be arranged in the position where the geomembrane is easily damage,and the zone of transitional material should be thickened as well.
出处
《水电能源科学》
北大核心
2014年第9期98-102,共5页
Water Resources and Power
关键词
复合土工膜
高土石围堰
渗流
应力变形
composite geomembrane
high rockfill cofferdam
seepage
deformation and stress
