摘要
土工膜可以有效降低输水渠道的渗漏量。当渠内无水时,对于地下水位较高的渠道,土工膜在地下水的作用下会承受较为明显的顶托压力,对其稳定性构成影响。对于设计水位超出地面高程0.5 m以内的深挖方砂性土渠段,对渠道坡脚处的土工膜采取压重及打孔措施以保证渠道基础及土工膜稳定,并基于MIDAS对不同方案进行了三维有限元渗流分析,从而对原土工膜孔系方案进行了优化调整,使其在渗流量及渗透比降可控的情况下,满足规范所要求的抗浮稳定性,可为其他类似工程提供有益参考。
Geomembranes can effectively reduce leakage in water conveyance channels.However,in channels with high groundwater levels,when the channel is dry,geomembranes are subjected to significant uplift pressures from groundwater,posing challenges to their stability.For deeply excavated sandy soil channel sections with design water levels within 0.5 m above ground elevation,this study implements weighting and perforation measures for the geomembrane at the channel slope toe to ensure the stability of both the foundation and geomembrane.Using MIDAS software,athree-dimensional finite element seepage analysis is conducted for different schemes,leading to the optimization and adjustment of the original geomembrane perforation design.The optimized perforation scheme ensures anti-floating stability in accordance with standards while maintaining controlled seepage flow and hydraulic gradient.These findings provide valuable references for the design of similar projects.
作者
刘卓
杨继松
赫庆彬
LIU Zhuo;YANG Jisong;HE Qingbin(Institute of Ocean Energy and Intelligent Construction,Tianjin University of Technology,Tianjin,300384;China Water Resources Beifang Investigation,Design and Research Co.Ltd,Tianjin,300222)
出处
《水利水电工程设计》
2025年第1期42-45,共4页
Design of Water Resources & Hydroelectric Engineering
