雅砻江锦屏水电站交通辅助洞施工控制与精度分析

Construction Control Survey and Accuracy Analysis of Jingpin Hydroelectric Power Station's Transportation tunnel on Yalong River

本文围绕雅砻江锦屏水电站辅助洞17.5 km交通隧道工程重点介绍洞内施工导线测量的精度,分析了其中两次复测结果产生较大偏差的原因,采用加测陀螺方位角的方法改善导线的点位精度,削弱旁折光等因素可能产生的误差影响,实测数据的处理结果与分析表明加测陀螺方位角大大提高了导线的精度和可靠性。

This paper focuses on the accuracy of construction traverse surveying of the 17.5 kilometers-long Jingpin Hydroelectric Power Station＇s transportation tunnel on Yalong River. The reason of big differences between two traverse surveying results is analyzed. The position accuracy of traverse surveying is improved by measuring gyro azimuth using high accuracy gyro- theodolite, meanwhile, the influence of lateral refraction error is also eliminated. The practical surveying results and consequent analysis shows that measuring gyro azimuth will tremendously improve the accuracy and reliability of traverse surveying.