Abstract 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 method for improving the precision of the traverse control network and ensuring breakthrough of the long tunnels. However, 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 breakthrough 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 precision 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 breakthrough points.
Abstract：
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 method for improving the precision of the traverse control network and ensuring breakthrough of the long tunnels. However, 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 breakthrough 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 precision 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 breakthrough points.
.A Study on the Optimized Adjustment Method of Maglev Gyro Control Traverse under Non-Weighted Measurement in Long and Large Tunnels[J] MODERN TUNNELLING TECHNOLOGY, 2016,V53(2): 44-47
2016, Vol. 53 