苏州地铁车站深基坑变形规律及影响分析

Analysis on Deformation Law and Influenceof Deep Foundation Pit in Suzhou Metro Stations

以苏州地铁3号线新区站及文昌路站深基坑地下连续墙变形监测数据为基础,研究不同开挖工况对围护墙体变形的影响规律,同时对坑底土体暴露时间下围护墙体变形进行分析,并对比有无路面盖板对基坑变形的影响。结果表明,施工过程中支撑架设不及时会导致基坑出现较大变形,同时,坑底土体对基坑变形有显著影响,另外,现浇路面盖板对基坑变形的约束效果显著。据此,提出施工单位应及时架设支撑、减少时空效应,施工应尽量缩短坑底土体暴露时间,设计应重点考虑现浇路面盖板对控制变形的有利方面等措施。

Based on the monitoring data of the deformation of the diaphragm wall of the deep foundation pit at Xin District Station and Wenchang Road Station of Suzhou Metro Line 3,this paper studies the effect of different excavation conditions on the deformation of the retaining wall,analyzes the deformation of the retaining wall under the exposed time of the soil at the bottom of the pit,and compares the effect of the presence or absence of the pavement cover on the deformation of the foundation pit.Results show that the unsuccessful support erection in the construction process will lead to large deformation of the foundation pit.At the same time,the soil at the bottom of the pit has a significant impact on the deformation of the foundation pit.In addition,the effect of the cast-in-place pavement cover on the deformation of the foundation pit is significant.Based on these,it is proposed that the construction unit should set up support in time and reduce the space-time effect.The construction should minimize the exposure time of the soil on the bottom of the pit,and the designunit should focus on the beneficial aspects such as the control of deformation of cast-in-place pavement covers.