Analysis of holing-through survey errors in shield tunnel

摘要

The primary task for the subway shield tunnel survey is to ensure the tunnel through. The holing-through survey error will have a direct effect on the quality and cost of shield tunnel construction, so in the designing of construction surveying accuracy of shield tunnel, how to reasonably give tunnel holing-through survey error and tolerance is a very important study in subway shield tunnel survey work.rnAccording to the requirements of shield tunneling technology and the practical conditions of the surveying construction, taking Line 3 subway (Xiajiao-Lijiao) in Guangzhou as an example, this paper makes a detailed analysis of the influence of the main survey errors on the shield tunnel holing-through survey, including the lateral error caused by ground control survey, TBM shaft connection survey error, underground traverse survey error. Furthermore, based on the unequal accuracy distribution principle, it also explores the distribution of the above errors at different stages and the required accuracy at different stages of surveying, which provides a reliable technique for working out an effective surveying scheme. Finally, taking the construction as an example, it describes the reason of the above errors distribution.