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为验证支护结构设计的合理性与安全性,对基坑支护结构的内力和变形进行研究.针对盘锦地下商业街的工程地质条件,采用现场监测方法,获得了钢支撑轴力、桩顶水平位移及周边建筑物沉降随时间的变化规律.监测分析结果表明:钢支撑轴力随开挖深度的增加而增加,其大小变化和开挖速度与方向、钢支撑架设与拆除时机、钢支撑与土的相互作用等因素有关;桩顶水平位移随开挖时间的推移而增加并最终趋于稳定,其变化主要是由土方开挖引起的,且与开挖后基坑无支撑暴露时间长短相关;周边建筑物沉降随开挖时间的递增而增大,增长速度前慢后快.通过与基坑支护结构内力与变形设计值及监测报警值进行比较,结果表明该基坑支护结构设计是安全合理的.
In order to verify the rationality and safety of the support structure design, the internal forces and deformation of the foundation pit supporting structure are studied.According to the engineering geological conditions of Panjin Underground Commercial Street, the on-site monitoring method is adopted to obtain the axial force of steel support, Horizontal displacement and settlement of surrounding buildings with time.The results of monitoring and analysis show that the axial force of steel support increases with the increase of excavation depth and its size changes and the excavation speed and direction, the timing of steel support erection and disassembly, the steel support And the interaction between soil and other factors; horizontal displacement of pile top increases with the excavation time and eventually tends to be stable, the change is mainly caused by earth excavation, and excavation excavation without support for the length of time The settlement of surrounding buildings increases with the increase of excavation time and slows down after the growth rate.Based on the comparison with the design values of internal force and deformation and the monitoring and alarm values of supporting structure of foundation pit, the results show that the supporting structure Design is safe and reasonable.