中国散裂中子源隧道控制网测量方法及精度探讨

摘要

For the large-scale linear and ring tunnel control network of CSNS(Chinese spallation neutron source)the specific observation scheme is expounded,and the control network layout,measurement method and data processing are introduced. The deviation of adjacent station fitting and beam adjustment are used to preprocess and calculate data. Through the precision of linear and ring tunnel data being analyzed and compared,some results can be gotten. The results show that:① the standard deviations of single station and multi-station between adjacent station are 0.03 mm,0.06 mm,it is obvious that the precision of ring data is slightly lower than that of straight line. ② For linear tunnel control network, the accuracy of beam direction is higher than that of horizontal direction and elevation direction. For the ring tunnel control network,the error of three directions is 0.22 mm or less. On the whole,although the points’ accuracies of the linear and the ring tunnel control network in three directions vary because of tunnel structure , they meet the accuracy requirements of the equipment installation.%针对 CSNS(中国散裂中子源)大尺度直线、环隧道控制网,阐述了具体观测方案,对控制网布设、测量方式及数据处理进行介绍.采用相邻站拟合偏差对数据预处理和光束法平差进行计算,对直线及环隧道测量数据、精度进行分析比较,结果表明:① 直线段和环线相邻站单站和多站拟合标准差值分别为 0.03 mm,0.06 mm,初步可知环线测量数据精度率略低于直线段;② 对于直线隧道控制网,束流方向点位精度高于横向和高程方向;对于环隧道控制网,三方向点位误差均在0.22 mm以内.整体而言,直线及环隧道控制网三方向点位精度虽因隧道结构变化有所差异,但均满足设备安装的精度要求.