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在存有较厚微承压水地层中进行地下连续墙施工,易发生槽壁缩孔和坍塌的危险。为避免此类情况发生,地下连续墙成槽前,可在地下连续墙外侧设置一定量的降压井,以降低粉砂土中微承压水的水头高度,减少外侧水土压力,使之与内侧泥浆压力持平。经实践检验,这种辅助成槽的方法,能够保证槽壁的稳定,使地下连续墙的施工质量得到保证。
The construction of underground continuous wall in thicker and slightly pressurized water stratum will easily lead to the danger of shrinkage and collapse of the groove wall. In order to avoid such situation, before the underground continuous wall is trenched, a certain amount of buck wells can be set on the outside of the underground continuous wall to reduce the water head height of micro-pressure water in the silt soil and reduce the pressure on the water and soil outside, The pressure inside the mud is flat. The practice test, this method of aided into the tank, to ensure the stability of the tank wall, so that underground continuous wall construction quality is guaranteed.