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本文介绍了某大厦基坑工程实例。该基坑位于粉砂性地基中，平均开挖深度12m，围护结构采用钻孔灌注桩，结合高压旋喷桩止水和止土，基坑内外共布置三级井点降水。基坑开挖表明该围护结构设计安全经济，为粉砂性地基中类似工程设计施工提供了借鉴。
This article introduced a building foundation pit project example. The foundation pit is located in a silt sand foundation with an average excavation depth of 12m. The bracing structure adopts bored piles, combined with high pressure rotary jet grouting piles to stop water and stop soil. Third-order well point precipitation is arranged inside and outside the foundation pit. Excavation of foundation pit shows that the design of the envelope is safe and economical, which provides a reference for similar engineering design and construction in silty sand foundation.