地铁轨道控制网网形设计及模拟计算分析

Design,Simulation,Calculation and Analysis of Metro Track Control Network

根据地铁隧道曲线段的不同曲线半径,设计了地铁轨道控制网的控制点纵向间距。以不同的观测精度,模拟生成含随机观测误差的地铁轨道控制网的观测值,采用边角网间接平差模型和方差分量估计方法进行平差计算,分析对比网的纵向间距、观测仪器的标称精度、平差后的最弱点点位中误差以及相邻点相对中误差之间的关系,确定地铁轨道控制网的合理布设网形及其精度指标。研究成果对地铁轨道控制网的布设及测量有实际参考价值。

According to the different radius of curve in metro tunnel,this paper calculates the longitudinal distance between two control points in metro track control network.With different observation accuracies,this paper simulates the observations with random error of the network,and adjusts the observations based on parameter adjustment of sideangle measurement network and Helmert variance component estimation method.According to the analysis of the relationships among the longitudinal distance,the nominal accuracy of the observation instrument,the most weakness position accuracy and the relative position accuracy of two points,we confirm the reasonable network of the metro track control network and its appropriate precision standard.Research result provides practical reference for point layout and network survey of the metro track control network.