自由设站法监测基坑水平位移的应用研究

A Study on the Free Stationing Method for the Monitoring of Horizontal Displacement in Building Excavation

基坑水平位移监测可以采用自由设站法用全站仪进行测量,提出了一种改进的自由设站法,该方法能有效解决基坑施工中水平位移监测难以找到合适固定测站和固定基准点的问题,而且可以不需要测定水平方向基准点的距离,因此该方法对于城市复杂环境下的基坑监测具有良好的适应性。另外该方法可以通过一次设站测量基坑一侧边上的全部监测点,容易操作,工作效率高。理论计算及误差分析表明了这种方法足以满足基坑监测精度的要求,模拟监测的结果也验证了该方法的有效性和适用性。

The free stationing total station survey method is usually used in the monitoring of horizontal displacement in a deep excavation. An improved free stationing method is proposed in this paper. This improved method can effectively resolve the problem of setting a stable station or stable reference point using the conventional free total station method. In addition, this method can be operated without measuring the distance between the station and the reference point. Therefore, the method can be easily operated and all the target points along the same side of the excavation can be monitored in just one stationing setup. The theoretical analysis and survey error estimation along with the experimental results demonstrate that proposed method is effective and reliable for the deep excavation deformation monitoring.