城市复杂环境下大型深基坑水平位移监测方法研究

Study on the Horizontal Displacement Monitoring Method for Big and Deep Foundation Pits in Urban Complex Environment

文中分析了城市繁华地段大型深基坑施工的环境特点和水平位移监测的要求,提出了通过基准点利用边角后方交会法进行设置测站,再以极坐标法对基坑进行监测的水平位移监测方案。对该监测方案的精度进行分析表明,采用合适的观测图形、适当的观测测回数,仪器和观测目标强制对中,选取有利的时间进行观测,能够满足基坑安全监测的精度要求。工程实践证明,该方案适合城市复杂环境下大型深基坑的水平位移监测。

In the paper, the author analyzes the environment character of monitoring for big and deep foundation pits in the downtown district and requests of horizontal displacement monitoring, provides to set the station by datum point using Corner resection method, and then uses polar coordinate method to monitor the displacement of foundation pits. The analysis of precision for this monitoring method shows that it can meet the requirements of monitoring precision for foundation pits using proper measurement figure and measurement times, forcing instrument middle, choosing good measurement time. Practice proves that the method suit for big and deep foundation pits horizontal displacement monitoring in the down-town district.