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为避免地下水对支挡结构的不利影响,需设置反滤层排除支挡工程背后岩土体的渗水。目前支挡工程多采用混凝土浇筑施工,受墙后空间狭小影响,常规的砂砾石反滤层不易压实,影响支挡工程受力和使用功能。文章结合反滤层的隔离挡土、过滤、排水等基本作用原理,研制开发了一种由隔水层、排水层、透水层相结合形成的具有墙背模板功能的PFF整体式复合反滤层,以适应混凝土支挡结构浇筑施工工法。试验工点排水试验表明,该新型反滤层排出水数量和效率均优于传统的砂砾石反滤层,可在支挡工程中推广应用。
In order to avoid the unfavorable influence of groundwater on the supporting structure, an anti-seepage layer shall be provided to eliminate water seepage from the rock mass behind the support engineering. At present, the use of concrete support construction projects often pouring, narrow impact by the wall space, the conventional sand and gravel filter layer is not easy to compaction, affecting the support engineering force and the use of functions. Combined with the basic principle of isolation, filtration, drainage and other basic principles of the filter layer, the article has developed a PFF monolithic composite filter layer with the function of a wall back formed by a combination of an aquitard, a drainage layer and a water permeable layer , In order to adapt to concrete support structure pouring construction method. Drainage tests at pilot sites show that the quantity and efficiency of effluent from the new filter layer are superior to those of conventional sand and gravel filters and can be widely applied in support engineering.