impervious blanket meaning in Chinese

不透水垫层
不透水面层
不透水铺盖
防渗铺盖

It is suggested that the impervious wall combined with curtain grouting should be taken as the main vertical impervious body for seepage control , and that the full use of slope wash and fully weathered zone as horizontal impervious blanket should be taken to reduce work load for seepage control
建议采取截渗墙结合帷幕灌浆作垂直防渗体为主的防渗措施，同时充分利用坡积土和全风化带作为水平防渗铺盖以减少防渗处理工作量。