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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 impervious walls with deep overburden, a typical floodgate was taken as an example to analyze the influence of different impervious walls on the seepage control effect. The results show that the location of vertical cutoff wall should be as close to the upstream as possible to reduce the uplift pressure of the bottom plate and the placement of sheet piles and other key parts such as the entrance and exit of the gate bottom. The short cut-off wall can significantly reduce the vertical descent and floor level at the exit Slope reduction; increase the penetration of hanging cut-off wall, can reduce the pressure and all parts of the infiltration slope, is conducive to seepage safety; multi-channel vertical seepage control measures, pre-cut-off wall penetration depth should be as large as possible , The rear cut-off wall should be shallow as far as possible in order to achieve the purpose of both reducing the pressure of the bottom plate and reducing the vertical exit-exit ratio at the exit.