基坑变形监测基准点偏移的原位校正技术及应用

Field calibration method for criterion point excursion and its application to foundation pit deformation monitoring

针对基坑变形监测基准点偏移的工程现象,根据距离差分定位原理,采用平面截割法,提出了一种新的基坑变形监测基准点原位校正技术,对平面截割双曲线的数学过程进行了推导,给出了该技术的实现过程,展示了采用平面截割法直接绘制出偏移点位置的基本方法,采用MATLAB软件编写了应用程序.采用该方法对某护城河岸附近一基坑变形监测基准点进行了原位校正,获得了理想的效果.该校正方法操作简单,实用性强,具有较好的工程推广应用价值.

Excursion of criterion point often occurs in pit deformation survey.Based on the principle of distance difference,a new field calibration technique for criterion points of pit deformation survey was put foreword.An accurate mathematical deduction for cutting the hyperboloid with plane cutting method was described.A realization procedure of the technique was presented.The process of drawing the position of post-excursion criterion point using plane cutting method was displayed.Application program for calibrating the criterion points using the technique was developed in MATLAB.The technique was applied to calibrate the criterion point of pit deformation survey on the bank of a moat,and an ideal effect was obtained.The method is an exercisable and effective way for calibrating the criterion point position,and also be potentially used in other related field.