某市公路箱涵施工试验阶段周边地表变形监测与分析

针对某市区箱涵施工，采用现场监测的手段，跟踪监测公路箱涵施工试验段周边地表变形的发展过程。通过分析监测数据，得出施工试验段周边地表的沉降、水平位移变形，主要集中在开挖基坑、钢板桩施工、开挖至底部和拔除钢板桩四个施工阶段，且拔除钢板桩时变形最大。通过对检测数据的分析:试验段的累计地表沉降、累计水平位移和裂缝变形等几个主要控制指标，均超过设计预警值，故原设计方案需进一步改进。

Monitoring and Analysis on Surrounding Surface Deformation of Road Box Culvert in Pilot Construction Phase

Against road box culvert construction of a city and by means of field monitoring,the developing process of the surrounding surface deformation of the road box culvert in pilot construction phase is tracked and monitored.Through analysis of the monitoring data,we obtained that the subsidence,displacement deformation of the ground surface in pilot phase are concentrated on pit excavation,steel sheet pile construction,excavation to the bottom and removal of steel sheet pile in four construction phases,and the deformation of the period segment of remove steel sheet piles is the largest.Through analysis of testing data,the major control targets including the total surface subsidence,total horizontal displacement and cracks deformation are all larger than designed alarm value.Hence the original design requires to be improved further.