Combined with a large pumping station project in Shaoxing,this paper monitors the construction period of a large deep foundation pit in soft ground,analyzes the surface deformation and deep horizontal displacement of the envelope pile,explores its deformation rule,carries out safety analysis,and compares and summarizes the deformation characteristics of soft soil deep foundation pit.The results show that the deformation of the envelope structure is closely related to the excavation depth,and the deformation develops rapidly during the excavation,and the change rate reaches the peak after the excavation to the design elevation.During the stage from floor pouring to structure construction,the deformation rate of each monitoring item decreases first and then converges.The influence of pumping station construction on the surrounding environment is mainly distributed during the excavation of foundation pit.The horizontal displacement of the envelope structure under the weak formation is smaller than that of the general formation,but the vertical settlement deformation is larger.The foundation treatment is needed to control the settlement of the project where the foundation pit is in soft soil such as silt soil.
关键词
软弱地层/深基坑工程/施工期监测/土体与围护结构变形/安全性分析
Key words
weak strata/deep foundation pit engineering/construction period monitoring/surface deformation/security analysis
维普
万方数据