Combined with engineering practice,the paper introduces a construction method of foundation treat-ment for foundation pit waterproofing by pressure-free grouting.Through the design of a bolehole site,a pressure-free grouting waterproofing method is used to treat foundations at the construction site to isolate groundwater,which can achieve water-free construction for underground projects.After waterproofing,through a hydraulic test,if the bottom of a foundation fit meets the requirements of water-resisting layers,anti-floating design measures can be canceled according to design specifications.In actual work,the application of pressure-free grouting in the construction of foundation pit waterproofing is tried,a groundwater area with a high water level is led from a part with strong permeability to a part with weak permeability through the borehole site design and sequence of grout-ing to form an aquifer to achieve the purpose of declining water,and the feasibility of isolating water and declining water in foundation pits by pressure-free grouting is also studied.
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