Aimed at the specific project cases of loess deep foundation pit in Lanzhou, this paper analyzes the reasons of local subsidence of foundation pit from two aspects of the construction technology and the surrounding environment impact, puts forward the related foundation reinforcement scheme to provide reference for the similar projects in the future.%本文针对兰州市黄土深基坑具体工程案例，从施工技术环节及周围环境影响两个方面分析了基坑出现局部塌陷的原因，并提出了相应的基坑加固方案，为今后类似工程提供借鉴和参考。
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