改进视准线法监测单一方向水平位移的精度分析

针对传统视准线法监测单一方向水平位移实施中遇到的问题,根据传统视准线法及极坐标法基本原理出发,对传统视准线法进行改进。该文称改进视准线法,并从监测原理、误差来源、精度估算等方面进行了分析,得出误差估算公式。分析结果表明,改进视准线法的监测精度可达到《工程测量规范》(GB50026-2007)变形监测等级二等精度及以上要求。利用该方法监测单一方向水平位移时,可在两端基准点不通视条件下,在视准线上任意设观测站观测,在满足观测精度前提下,可增大测点偏离视准线的距离,在单一方向水平位移工程监测实践中有较好的利用价值。

Inspection Accuracy Analysis of Horizontal Displacement with Improved Collimation Line Method

Based on the problems in inspecting the horizontal displacement at the single direction with the traditional collimation line method, combine with which and the basic principles of polar coordinate method, the traditional method is improved, called"improved collimation line method"in this paper. From aspects of inspection principles, error origins, accuracy estimation and so on, the error estimation formula is obtained. The analysis shows that the inspection accuracy of improved collimation line method meets the requirements of grade two or above of transformation inspection stated in Code for engineering surveying (GB50026-2007). When applying this method to inspect the horizontal displacement at the single direction, you can set an inspection station at your will on the collimation line under the condition of the datum points of the two ends missing, and you can also prolong the distance of the inspection point toward the collimation line with the precondition of satisfying inspection accuracy. This method is quite useful in similar engineering.