基于原位监测数据的某深基坑变形特性分析

Analysis of Deformation Characteristics of a Deep Foundation Pit based on In-situ Monitoring Data

基坑变形引起的基坑安全事故时常发生,对基坑进行变形监测对于保障工程安全意义重大。本文通过对某深基坑桩顶水平位移、深层水平位移、地表沉降进行监测,研究了基坑水平位移和沉降的变化特征,总结了位移变形特性。试验结果显示,深层水平位移逐渐增大,在基坑开挖面以上变化快,基坑底部变形迟缓;地表沉降显示南侧变形为下沉趋势,北侧则先下沉后抬升。监测结果显示该基坑变形量较小,变形处于可控范围之内,该工程支护结构设计合理。

Foundation pit safety accidents caused by foundation pit deformation often occur,and the deformation monitoring of foundation pit is of great significance to ensure the safety of the project.In this paper,the horizontal displacement and settlement characteristics of the foundation pit are studied by monitoring the horizontal displacement of the pile top,the deep horizontal displacement and the surface settlement of a deep foundation pit,so as to summarize the displacement deformation characteristics.The test results show that the deep horizontal displacement gradually increases,the change is fast above the excavation face of the foundation pit,and the deformation at the bottom of the foundation pit is slow.The surface settlement shows that the deformation on the south side is a subsidence trend,and the north side is first subsidence and then uplifting.The monitoring results show that the deformation of the foundation pit is small,the deformation is within the controllable range,and the design of the supporting structure of the project is reasonable.