模袋砂围堰在大洞口水闸施工中的应用

Construction Technology and Application of Sandbag Cofferdams in Deep Flow Molding Silt Geological Conditions

为解决大洞口水闸深厚流塑性淤泥地质条件下土石截流围堰施工取土不便、填筑困难、造价高等问题,截流采用钢板桩+模袋砂轻型围堰方案。该方案结合了钢板桩和模袋砂围堰的优点,具有较好的防渗性能和适应地基变形能力,成功实现了深厚流塑性淤泥河床截流,为主体工程提供了安全、稳定的基坑施工空间,较之传统的土石围堰更经济合理。

In order to solve the geological conditions of deep plastic silt in a sluice gate, the construction of earth and rock cutoff cofferdam is inconvenient, difficult to fill, and the high cost is insufficient. The cutoff cofferdam adopts a steel plate pile+mold sandbag light cofferdam scheme. The cofferdam combines the advantages of steel plate piles and mold sandbag cofferdams, has better impermeability and adaptability to deformation of the foundation, successfully completed the deep flow of plastic silt river bed interception, and provided a safe and stable foundation pit construction space for the main project. Compared with traditional earth and stone cofferdams, significant economic benefits have been achieved.