通过对工程项目概况的了解,结合工程的地质状况,在分析了开挖对周围小区和地铁干线影响的状况下,对平凉街道22街坊商办地块项目进行基坑开挖和支护进行了设计.鉴于基坑工程深度大,周围环境复杂,并且紧邻地铁隧道,为了减少开挖对周围环境的影响,合理的进行施工.根据当地的地质状况及基坑的特点,采用明挖顺做法进行施工,围护体采用地下连续墙、灌注桩结合止水帷幕两种形式.对在深基坑施工过程中的支护结构及周围的环境变形进行监测方案的设计,并就施工对周围环境的影响进行分析.结果表明可满足该工程的稳定性要求和对周围环境的影响,为进一步研究其他基坑和类似工程提供借鉴.%Based on the project profile and its geological conditions ,after analyzing the influence of the excavation in the surrounding area and the main subway line ,this paper designed the pit excavation and support about 22 square building of the Pingliang street .Because of the great depth of foundation pit engineering ,the complex surrounding environment , and engineering close to the subway tunnel ,it need to be constructed carefully .According to the local geological condi-tions and the characteristics of the foundation pit ,we adapt Open Cut Methods Construction Technology ,and fender con-struction were raised by using Underground Diaphragm Wall and Bored Pile combined with Water Proof Curtain .The de-sign of the monitoring scheme for the deformation of supporting structure and surrounding environment during the progress of constructing the deep pit is carried out .At the same time ,the effect of construction on the neighboring environment is analyzed .The results show that the scheme can meet the stability requirements and the influence to the surrounding envi-ronment is acceptable ,and provide reference for further study of other foundation pit engineering and similar projects .
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