三维坐标法在深基坑变形监测中的应用

针对施工场地狭窄，无法运用传统方法进行变形观测的情况下，对深基坑的变形观测提出了三维坐标法．基于全站仪能同时观测角度、距离和高程的特点，通过观测变形点的坐标变化，计算出变形观测点的水平位移和沉降量．此方法灵活、方便、经济、高效，可在一定范围内代替几何水准的工作，尤其在施工现场狭窄，其它监测方法不方便的情况下能起到事半功倍的效果．通过精度分析，并与沉降观测数据对比，其观测精度满足深基坑变形观测的精度要求．

The application of 3d-coordinate method in the observation of deformation of deep foundation pit

It is proposed that the 3d-coordinate method should be used as the solution to the problems caused by narrower construction sites where the traditional methods are not applicable. By using total station to survey the angle, distance and elevation at the same time, the differences of coordinate of observation points can be measured, and the horizontal displacements and differential settlement can be attained. This flexible, convenient, economical and efficient method can be used instead of direct leveling when other methods are unsuitable, especially in the narrower field. According to the analysis of the precision and the comparision of the data of settlement measurement, the precision of this method meets the requirement of the observation of deformation.