基于自由测站的基坑水平位移监测方法探讨

A discussion based on free-station about the method of foundation pit horizontal displacement monitoring

本文从城市基坑水平位移监测的实际情况出发,引入了高速铁路基于自由测站的CPⅢ控制网的观测方法来进行基坑水平位移监测。通过理论分析和工程实例验证,基于自由测站的基坑水平位移监测法测站摆放灵活、网形多变,对于形状复杂、施工干扰较大的基坑变形监测能提高作业效率;采用高等级的全站仪进行观测可以满足一级基坑的监测精度要求,可达到为基坑施工快速、准确反馈变形信息的目的。

In this paper, according to the actual condition about the horizontal displacement monitoring of foundation pit in the city, an observation method based on CP19 control network of free-station on the high-speed rail to carry out the monitoring of foundation pit horizontal displacement was introduced. Through theory analysis and verification of engineering examples, by using this method the observation station could be placed flexibly, the net types could be variable. As for those foundation pits which have complex shapes and large construction disturbance, the construction efficiency would be improved. This method could meet the monitoring accuracy requirement of first grade foundation pit with the observation using high grade total station, in order to reach the goal to feedback deformation information immediately and accurately for the foundation pit construction.