隧道施工地面导线网的合理布设

本文根据间接平差理论推导出隧道施工导线网的边角测量误差所引起的横向贯通误差的严密计算公式,讨论了边角权的选取对横向贯通误差的影响,以横向贯通误差为依据,对导线网图形及其最优化设计进行了讨论和论证,指出了导线作为隧道地面施工控制的优点和值得注意的一些问题。

Discussions on the design of a surface traverse network for setting out tunnels

Based on the least square adjustment by indirect observations,this paper gives the rigorous formulas for calculating the lateral break-through error caused by surveying errors of a surface traverse network for setting out a tunnel.Starting from this lateral break-through error and considering some examples,the influence caused by the different weights selected for the direction and distance observations,the optimization for the figure and observation programme of the traverse network are discussed.The advantages of adopting traverse network as a control for setting out a tunnel and some problems to which attention must be paid in the design are pointed out.