In the process of setting the traverse control network in a long and large tunnel, an additional surveying gyroscopic azimuth is commonly used to correct the error accumulation of the traverse, and this is an effective meth-od for improving the precision of the traverse control network and ensuring breakthrough of the long tunnels. Howev-er, it is hard to objectively assess the quality of the orientation results in every survey time due to the timeliness of the gyroscope north-finding process, therefore, each gyroscopic azimuth is regarded as a steady orientation side or equal precision observation during the traverse adjustment, which is surely unfavorable for the accurate break-through of long tunnels. In order to solve this problem, the orientation results of the gyroscope sides are evaluated and an unequal precision principle is proposed for the adjustment optimization of the underground traverse based on the newly self-developed acquisition technology of the maglev gyroscope massive north-finding observation data. Based on actual assessment results and a certain tunnel project, a comparison is made between the unequal preci-sion adjustment optimization method and the conventional equal precision data processing method, which proves that the unequal precision adjustment optimization method can effectively improve the positional accuracy of break-through points.%在布设长大隧道导线控制网过程中,通过加测陀螺边的方法对导线误差累积进行修正,是提高导线控制网精度、确保隧道贯通最为常用且行之有效的方法.但由于陀螺寻北过程的时效性,无法对每一测回的定向成果进行客观的质量评估,因此在导线平差处理时,只能将各条陀螺边视为坚强边或等精度观测,这无疑对于长大隧道的精确贯通是不利的.文章针对这一问题,依据我国新近自主研发的磁悬浮陀螺仪海量寻北观测数据采集技术,对陀螺边的定向成果进行质量评估,提出了一种基于非等精度的原则对地下导线进行优化平差处理方法.根据实际评估结果,并基于某长大隧道工程实例,对非等精度平差优化方法与传统的等精度数据处理方法进行比对,结果证明非等精度优化法可以有效提高贯通点的点位精度,验证了该方法的有效性.
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