地铁车站深基坑现场实测研究

以南京地铁某车站深基坑为工程背景,对基坑变形及周边建筑沉降进行数据分析,结果表明：基坑侧向变形的最大值一般出现在基坑开挖面附近;地表沉降在开挖前期、中期变化速率较大,后期基坑处于趋稳状态,地表沉降速率减缓;基坑开挖对于无桩基础建筑物的影响要远大于有桩基础建筑物,开挖期间尤应加强临近基础薄弱的建筑物的监测与监控.

Research on Field Measurement of Deep Excavation for Subway Station

Taking a deep excavation of Nanjing subway station as project background, this paper studied excavation deformation and surrounding buildings settlement.The conclusions were as follows： the maximum value of lateral deformation of excavation generally occured near the excavation surface; surface subsidence rates in excavation early-term and medium-term were bigger than late-term because supporting facilities for deep foundation excavation almost had been set up completely. On later stage, deep excavation was going to a stabilization state, therefore surface subsidence rate slowed down. Influences of excavation to no- pile foundation building are much more than pile foundation building, so monitoring and controlling of weak foundation buildings nearby should be strengthened during excavation.