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1 前言近年来随着建设工程规模的大型化,作为构筑物基础、地下空间的开挖工程亦日趋大规模化和深基坑化。在市区范围内,为控制因过量抽汲地下水而引起的地基沉降,实施了有关抽水的规章制度,使地下水位呈上升状态。这种情况表明,地下工程中的地下水的处理,对工程的经济、安全以及确保工程如期完成,将成为非常重要的因素。在地下开挖工程中,需要对地下水处理的前提是:(1)为提高施工性能所要求有干
1 Introduction In recent years, with the enlargement of the scale of construction projects, as the foundation of structures, the excavation of underground space has also become increasingly large-scale and deep-foundation pit. In the urban area, in order to control the settlement of foundations caused by excessive pumping of groundwater, regulations on pumping are implemented to raise the water table. This situation shows that the treatment of underground water in underground works will be a very important factor for the economy and safety of the works and for ensuring the completion of the works as scheduled. Underground excavation projects, the premise of the need for groundwater treatment is: (1) in order to improve the performance of the required dry