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深厚覆盖层地基渗流控制数值分析

发表时间:2013-07-31  浏览量:978  下载量:477
全部作者: 温立峰,柴军瑞,王晓
作者单位: 西安理工大学水利水电学院;三峡大学水利与环境学院
摘 要: 结合某工程实例,应用有限元分析方法,系统分析地基防渗墙深度、铺盖长度及覆盖层土体渗透性等因素对坝基渗流控制效果的影响。分析表明:覆盖层渗透系数较大时(如k>1×10-5 m/s),覆盖层成为大坝渗流的主要通道,防渗墙只有完全截断覆盖层才能取得较好的防渗效果;当采用悬挂式防渗墙时,防渗墙深度取其与覆盖层厚度之比为0.7左右时较为合理;单纯依靠铺盖不能有效控制覆盖层地基渗流;覆盖层渗透性是坝基渗流控制较敏感因素,其渗透系数大小及渗透各向异性均对大坝渗流场有一定影响。
关 键 词: 水工结构;深厚覆盖层;渗流控制;数值分析;面板堆石坝
Title: Numerical analysis on effect of seepage control measure for deep overburden
Author: WEN Lifeng, CHAI Junrui, WANG Xiao
Organization: Institute of Water Resources and Hydro-electric Engineering, Xi’an University of Technology; College of Hydraulic and Environmental Engineering, China Three Gorges University
Abstract: Combining with a project example and using the finite element method, a systematic study which analyzed the impact of anti-seepage wall depth, blanket length and permeability of the overburden on the effect of seepage control was made. The computed result showed that when the permeability coefficient of the overburden was relatively larger (ie. k>1×10-5 m/s), the overburden became the main seepage channel and it could not achieve good anti-seepage results until the anti-seepage wall was inserted into the relatively impermeable layer. When the hung-upside down imperious wall was used, the relative depth ratio between the anti-seepage wall and overburden was suggested as 0.7. The waterproof blanket was not effective enough to control seepage when the permeability coefficient of the overburden was relatively larger. The permeability of the overburden was a sensitive factor to the effect of seepage control measure for deep overburden whose permeability coefficient and permeability anisotropic both had some impacts on the dam seepage field.
Key words: hydraulic structure; deep overburden; seepage control; numerical analysis; concrete faced rockfill dam
发表期数: 2013年7月第14期
引用格式: 温立峰,柴军瑞,王晓. 深厚覆盖层地基渗流控制数值分析[J]. 中国科技论文在线精品论文,2013,6(14):1359-1367.
 
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