基坑工程地下水控制管理若干问题

Discussion on the Groundwater Control Management of Foundation Excavation

城市基坑工程建设中地下水的抽排控制关系到基坑安全、周边环境安全及水资源保护等多方面问题,目前对应的地下水控制管理缺乏一定的系统性和规范性,按建设过程将其控制管理框架分为3层式,分析了基坑工程环境水文地质评价的重要性,针对地下水控制设计建议推行基坑围护-降水-环境措施的多维一体化专项设计,并加强微观工程性地面沉降的控制分析,分析了深基坑抽汲地下水外排量的现状,提出了建立地下水抽排的缴费制度和地下水回灌交易市场的建议,探讨了缴费制度和市场平衡中的一些计算原则。

The groundwater pumping in the foundation excavation tend to affect many problems including the excavation safety, environmental safety and protection of water resources. At present, the groundwater control management is lack systemic and normative. According to the construction process, the technical management of the three-tier management framework was set up, the significance of environmental hydro-geological assessment of the foundation excavation was analyzed, the multi-dimensional integration design of retaining-dewatering-environmental measures in groundwater control was suggested, and the microcosmic land subsidence control was discussed, the current situation of dewatering of deep foundation excavation was recommended, groundwater pumping payment system and groundwater recharge trading market was proposed, some calculation principle of the balance of the payment system and the market was discussed.