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青海高原某深基坑工程实践中,采用放坡、土钉墙、桩锚联合支护方案进行基坑支护。由于含水层为巨厚砂层,渗透系数大,地下水位较高,为防止基坑产生流砂等,切实作好地下水的治理工作是本基坑工程成败与否的关键。在综合比较了截水、降水、集水明排的经济和技术可行性后,确定采用管井降水方案。采用简化基坑形状,按大井法均质含水层非完整井公式进行基坑涌水量计算,对降水施工出现的问题给出了应对措施。最后对该支护降水设计施工要点进行了总结。
In practice, a deep foundation pit project in Qinghai Plateau is used to carry out foundation pit support with grading, soil nailing wall and pile-anchor combined support scheme. As the aquifer is a thick sand layer, the permeability coefficient is large, the groundwater level is higher, in order to prevent the production of runoff sand pit and so on, to make a good groundwater management work is the key to the success or failure of the foundation pit project. After comprehensively comparing the economic and technical feasibility of water cutoff, precipitation and water catchment, it was decided to adopt the pipe well precipitation plan. Based on the simplified foundation pit shape and calculation of water inflow of foundation pit according to the formula of the non-complete well of the big well method of homogeneous aquifer, the countermeasures for the problems occurred in the precipitation construction are given. Finally, the supporting design and construction of precipitation points are summarized.