拦河坝砼防渗墙的施工技术

Concrete Seepage Cut-off Wall Construction for a River-crossing Dam

拦河坝砼防渗墙多在砂层与砂卵石层上施工。地基处理根据地质条件选择，施工方法有无导孔挖槽、导孔挖槽、冲击成槽、回转钻成槽、锯槽机成槽。锯槽机为新型防渗成墙材料提供了新的施工手段，但有局限性。

The seepage cut -off wall for the river-crossing dam is usually installed in the sand and the sandy gravel. The dam site treatment depends on the geological conditions and the construction methods include trench-cutting without pilot hole, trench-cutting with pilot hole, percussive trenching, rotsry trenching and trenching by trench saw. The trench saw provides a new construction method for the new seepage cut-off walling material, but has its limitation.