免棱镜全站仪测量拱顶下沉的方法与分析

为了提高地下隧道工程施工中,拱顶下沉测量工作的速度和精度,采用免棱镜全站仪测量拱顶下沉,运用测点间高差相减的方法,消去量取仪器高和目标高的误差影响.用测量数据2次求差,减弱仪器系统误差的影响,提高洞内测量的速度和精度.经实践数据分析,该方法能有效地提高测量拱顶下沉的速度和精度.但应在设站、照明、距离及仰角测量,特别是测点目标的图形样式与明亮度等细节方面,注意不断积累经验,改进方法,保证稳定的测量精度要求.

Method and analysis of arch settlement measurement bynon-prism total station

In order to improve the speed and precision of underground projects construction,a method of arch settlement measurement by non-prism total station was used. The elevation of points were subtracted to eliminate measurement errors of target and instrument height.Difference of twice measurement data can weaken the effect of errors and increase the precision greatly.Measurement data prove that this method is highly effective for improving the speed and precision,but details such as setting station,lighting,mea...