摘要
堤坝的安全问题主要是由渗流破坏引起的,特别是土质堤坝,并且具有隐蔽性,有必要通过渗流计算来分析坝体稳定性。而坝基土层具有分层结构,各层的渗透系数、孔隙率等参数,都会影响堤坝的防渗效果。提出了一种基于坝基分层结构的防渗墙设计,针对不同结构的堤基型式选取不同的防渗墙类型。利用有限体积法的数值模拟软件Fluent的多孔介质模型,考虑堤坝地基分层的结构,通过设置深度参数来研究悬挂式和封闭式防渗墙防渗效果。通过压力云图、速度云图、流线图以及关系曲线图,分析坝底面扬压力和背水侧出口处渗流量与各影响因素的关系,从而对防渗墙的厚度、渗透系数等相关参数进行优化以及确定合理的位置分布。最后,结合工程实践分析得出该堤坝模型的蓄水位限值,为设置有混凝土防渗墙的重力坝堤坝设计提供参考,具有重要的现实工程意义。
The safety problem of dam is mainly caused by seepage damage,especially soil dam,and it has concealment,so it is necessary to analyze the stability of dam body through seepage calculation.The seepage prevention effect of the dam is affected by the layered structure of the soil layer,the permeability coefficient and porosity of each layer.Therefore,a design of cut-off wall based on layered structure of dam foundation was proposed,and different types of cut-off wall are selected according to different types of dam foundation.By using the porous media model of numerical simulation software Fluent of finite volume method,considering the layered structure of embankment foundation,the impervious effects of suspended and closed impervious walls were studied by setting depth parameters.Secondly,through pressure cloud map,velocity cloud map,flow chart and relation curve diagram,the parameters such as thickness and permeability coefficient of impervious wall and reasonable location layout were determined.Finally,fluent software was still used for simulation calculation.Combined with engineering practice analysis,the water level limit of the dam model was obtained.It is of great practical engineering significance to provide reference for the design of the dam of gravity dam with concrete impervious wall.
作者
邓佳
李久江
李新月
张钰萌
张安琪
赵军
马会中
张兰
DENG Jia;LI Jiu-jiang;LI Xin-yue;ZHANG Yu-meng;ZHANG An-qi;ZHAO Jun;MA Hui-zhong;ZHANG Lan(Mechanics and Safety Engineering College, Zhengzhou University, Zhengzhou 450001, China;Aeronautics and Astronautics College, Zhejiang University, Hangzhou 310058, China)
出处
《科学技术与工程》
北大核心
2022年第6期2454-2461,共8页
Science Technology and Engineering
基金
国家自然科学基金(11602227)
2018年度河南省重点研发与推广专项(科技厅科技攻关)(182102310891)。
