深厚覆盖层地基渗流控制数值分析
首发时间:2012-12-03
摘要:在深厚覆盖层上建坝,基础的防渗是关键技术问题。结合某工程实例,应用有限元分析方法,系统分析了地基防渗墙深度、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,其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,而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地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,其渗透系数的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
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Numerical Analysis on effect of seepage control measure for deep overburden
Abstract:To build a dam upon the deep overburden foundation, the first problem to solve is the seepage of the dam foundation. Using the finite element method, a systematic study is made here in the aspects of the depth of the anti-seepage wall and the length of the blanket for deep overburden and the soil permeability of the overburden of a project example. The computed result shows that when the permeability coefficient of the overburden is bigger, the overburden becomes the main seepage channel. It will not achieve good anti-seepage results until the anti-seepage wall inserts into the relatively impermeable layer and when use the hung-upside down imperious wall, the relative depth ratio between the deep of anti-seepage wall and overburden is suggested take as 0.7. The waterproof blanket cannot be relied on to control seepage when the permeability coefficient of the overburden is bigger. The permeability of the overburden is a sensitive factor to the effect of seepage control measure for deep overburden whose permeability coefficient and permeability anisotropic of the overburden has some impact on the dam seepage field.
Keywords: Hydraulic Structure deep overburden seepage control Numerical Analysis Faced rockfill dam
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