研究目的：武广客运专线浏阳河隧道 3#竖井深约51.03 m,承担约 1.5 km的施工任务 ,要实现两端分别与斜井和出口贯通 ,测量精度要求高 ,且井口小 ,采用一井定向 、两井定向联系测量等方法精度低且施作困难 。为确保武广客运专线顺利贯通 ,根据所处的地理环境和井身结构特点 ,应研究确定竖井联系测量方案 ,在保证精度的前提下 ,确保施工的顺利进行 。
研究结论：经研究比选 ,决定采用铅锤仪和陀螺经纬仪联合定向法进行测量 。 阐述了该方法的测量原理和实施步骤 ,陀螺定向测量次数不应少于 3次 ,在进行陀螺定向测量之前必须对地面控制网进行闭合测量 ,同时需在地面选择一已知边 ,使用陀螺仪测量其陀螺方位角 ,与其反算方位角进行比较 ,并检验测量精度 。 通过贯通后测量结果验证 ,测量精度满足客运专线长大断面隧道施工要求 。
Research purposes：The Silo 3 of Liuyanghe Tunnel of Wuchang - Guangzhou Passenger Dedicated Line is about 51.03 m deep and the length of the construction area of silo 3 is about 1.5 km. The high measurement accuracy is required for linking up the two ends of the silo with the inclined shaft and exit separately due to small silo portal. Using one - shaft orientation or two - shaft orientation method, it is hard to operate with low measurement accuracy. In order to through connect the whole Wuchang - Guangzhou Passenger Dedicated line, the connectional measurement plan for the silo should be determined in accordance with the local geographical condition and the structural feature of the silo for smooth construction of the silo with high accuracy.
Research conclusions：Through comparison, it is determined to conduct the measurement jointly with lead - hammer meter and gyro. The measuring principle and procedure of this method are described. The directional measuring number of gyro is at lease not less than three times. Before doing so, the ground control net should be measured closely and at the same time one known side on ground should be chosen to measure the position angle between it and gyro. This position angle should be compared with the inversely calculated position angle and its measurement accuracy should be verified. The measurement result after the through connection of the line shows the measurement accuracy can meet the requirement of large section tunnel construction of passenger dedicated line.
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