深厚覆盖层闸基渗控效果及防渗措施

Research on Effects of Seepage Control and Prevention Measures for Sluice Foundation on Thick Overburden Layer

为研究深厚覆盖层透水地基防渗墙的防渗效果,以典型闸为例,分析了不同防渗墙布设位置、空间几何尺寸、贯入度对渗流控制效果的影响。结果表明,垂直防渗墙的布设位置应尽量靠近上游,以减小底板扬压力,闸底进出口处等关键部位设置板桩、短截墙可显著降低出口处垂直出逸坡降和底板水平坡降;增加悬挂式防渗墙的贯入度,能降低扬压力和各部位渗透坡降,有利于渗流安全;对多道垂直防渗措施,前置的防渗墙贯入深度应尽量大,后置的防渗墙应尽量浅,以达到既能降低底板扬压力,又能减小出口处垂直出逸比降的目的。

In order to study the seepage prevention effect of suspended cutoff wall on deep overburden layer pervious foundation.Taking the typical sluices as an example,this paper analyzed the impacts of different arrangement locations,space geometric size and penetration depth on seepage control effect.Results show that the site of vertical anti-seepage measurement should be close to the upstream as much as possible to reduce the uplift pressure of bottom board;the hydraulic gradient at the key parts such as the intake and outlet of groundwater is considerable,it is necessary to set sheet piles or short cutoff walls at these critical locations.What＇s more,the penetration depth of the cutoff wall has great influence on the seepage control effect.The more depth,the more beneficial to seepage stability and it is necessary to choose appropriate site and penetration depth of the cutoff wall in engineering application.