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Breakthrough Error Estimation of Undersea Tunnel of Bohai Strait and Its Control Network Precision Design |
ZHANG Guan-jun, WANG Bing-hai |
The Third Railway Survey and Design Institute Group Corporation, Tianjin 300142, China |
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Abstract In order to study the influence of the undersea tunnel of Bohai Strait construction control survey on construction completed, the breakthrough error is estimated and analyzed based on the designed undersea tunnel with the longest length. According to the breakthrough error, the precision of construction control network is designed. Research conclusions:(1)The breakthrough error of tunnel affected from four aspects, such as outside tunnel GPS control survey, inside tunnel traversing, outside height transfer across the strait and inside tunnel leveling. The inside tunnel traversing and outside height transfer across the strait have more significant impact on breakthrough error. (2)This paper has proposed some suggestions about the tolerance of breakthrough error of the Bohai Strait tunnel between the longest breakthrough faces, and the solution on precision design of horizontal and vertical control network of inside and outside tunnel. (3)By the current measuring tools, methods and accuracy, the surveying technology for the construction and the breakthrough of Bohai Strait undersea long tunnel is feasible, and its breakthrough error is controllable. (4)The research results have important reference value for the technical plan making and its implementation of construction control survey for undersea tunnel of Bohai Strait railway corridor and similar project.
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Received: 21 April 2014
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