二元结构含水层降排水设计施工探讨

为保护建筑场地的原始环境,针对不同属性的地下含水层制定不同的降排水方案,浅部孔隙型潜水的处理方法以止降结合的疏干排水为主,深部承压水则采用减压井来控制地下水水头,同时在降水过程中辅以多种监测手段。施工阶段则要严格按设计要求进行成孔、下井管、填滤料、封孔、洗井、预降水,降水井运营期间要做好井的保养维护,做到控制性的按需降水。

Dewatering Design and Construction in Dual Stratigraphy Aquifers

The dewatering design in the deep excavations in the urban area has an important role of minimizing the disturbanceof the adjacent environment. To achieve this goal, the dewatering design should be based on the different underground soil conditions. For shallow groundwater depositions, the conventional method is to prevent the infiltration of surface water and todrain the shallow water tables. The well points are usually used to control the deep pressurized aquifers. Monitoring is an im-portant measure in the ground surface deformation induced by the dewatering operation. The design requirements at every as-pects of each element installation of the borehole, casing lowering, filling of the filtering material, well washing and preliminary dewatering testing as well as dewatering operation, should be closely followed.