Abstract
In the long tunnel connection surveying, GNSS technology is generally used to measure the ground azimuth and transmit benchmark to the underground. Constrained by topographic conditions and other special factors, it shows a great difference between the height of ground control point and entrance point, and the tunnel break-through accuracy is affected by the plumb-line deviation. The gravity anomalies measurement and astronomical measurement are the common ways to calculate the plumb-line deviation correction. Although there are many local model algorithm of plumb-line deviation, the model parameters are not easy to obtain, and the calculation accuracy is hard to guarantee. The GNSS relative positioning and orientation technology can easily obtain the distance between two base lines, azimuth and geodetic height difference; the normal height difference between two base lines can be obtained by leveling or trigonometric leveling method. Hence in the small area and the region of linear change, it is an ideal way to use GNSS/leveling method to calculate the plumb-line deviation. In view of the fact that there is a great difference between the height of ground control point and entrance point in Hanjiang-to-Weihe river water diversion Qinlig Mountains Long Tunnel Project, the authors analyzed the influence of plumb-line deviation on the long tunnel through error, calculated the plumb-line deviation by adopting GNSS/leveling method, the results were compared by the global gravity model (GGMplus) calculation. The example results show the superiority of GNSS/leveling method, it is applicable to calculate the influence value of through error which affected by the plumb-line deviation, and optimized the reliability of the break-through error estimation.
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Acknowledgements
This research was partially supported by the National Natural Science Fund (No. 41504001) and Fundamental Research Funds for the Central Universities (No. 310826175016). And I would like to express my sincere heartfelt thanks to Hanjiang-to-Weihe River Valley Water Diversion Project Construction Co. Ltd Shaanxi Province and China Railway First Survey& Design Institute Group Co., Ltd for the data support.
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Ma, J., Yang, Z., Ji, G. (2017). The Determination of Plumb-Line Deviation by Adopting GNSS/ Leveling Method in Super Long Tunnel Break-Through Measurement. In: Sun, J., Liu, J., Yang, Y., Fan, S., Yu, W. (eds) China Satellite Navigation Conference (CSNC) 2017 Proceedings: Volume I. CSNC 2017. Lecture Notes in Electrical Engineering, vol 437. Springer, Singapore. https://doi.org/10.1007/978-981-10-4588-2_10
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DOI: https://doi.org/10.1007/978-981-10-4588-2_10
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