基于Usher模型的基坑围护结构受力变形监测仿真

Simulation of Stress and Deformation Monitoring of Foundation Pit Retaining Structure Based on Usher Model

基坑围护结构受力变形监测过程中监测点容易被遮挡和破坏,不能实现对变形情况的持续监测。为了保障基坑工程的施工安全,提出基于Usher模型的基坑围护结构受力变形监测方法。通过由CCD摄像机、激光测距系统和激光扫描系统构成的三维激光扫描仪实现围护结构的三维可视化扫描,获取基坑围护结构信息。根据扫描获取的数据计算基坑围护结构的土压力和桩撑结构系数,根据计算结果采用Usher模型获取基坑围护结构的沉降量,完成受力变形监测。实验结果表明,所提方法在不同工况下均能够对基坑围护结构的受力变形情况实施有效监测,具有较高的监测精度。

In the process of monitoring the stress and deformation of the foundation pit enclosure structure, the monitoring points are easy to be covered and damaged, so it is unable to realize the continuous monitoring for the deformation. In order to ensure construction safety, a method for monitoring the stress and deformation of the foundation pit enclosure structure based on Usher model was proposed. The 3D laser scanner composed of CCD camera, laser ranging system and laser scanning system was used to realize the 3D visual scanning for the enclosing structure. And then, the information of the structure could be obtained. Based on the scanned data, the soil pressure and pile support structure coefficient were calculated. Depending on calculation results, Usher model was used to calculate the settlement of the foundation pit enclosure structure, and thus to complete the stress and deformation monitoring. Experimental results prove that the proposed method can effectively monitor the stress and deformation of the foundation pit enclosure structure under different conditions, with high accuracy.