Research on schemes of shield direct cutting launching

Abstract

Abstract: With the development of shield construction technology, the use of shield direct cutting launching for tunnel initiation has become increasingly prevalent.In shield tunneling construction, the launching is an important link that is prone to accidents. Compared to traditional manual chiseling of the tunnel door, the cutting disc directly cuts the tunnel door during direct cutting launching, avoiding the occurrence of a free surface on the soil mass of the tunnel face, thereby reducing.Taking the subway shield tunnel engineering in Zhengzhou shield direct cutting launching as a case study, the finite element software Midas GTS NX was employed to the effects of the tunnel portal break and dynamic tunneling shield in retaining structure deformation, deformation of soil around the pipe deformation and so on, verifying the shield end cut the rationality of the initial solution. In order to verify the reliability of numerical simulation, a comparative analysis was conducted between the numerical calculation results and field monitoring data. The comparison showed consistent variation results, indicating that the results of numerical simulation are reasonable.

Key words: direct cutting launching, dynamic tunneling of shield, deformation analysis, monitoring measurement

CLC Number:

TU94

WEN Sen, ZHANG Guo-jian, LIU Jun-jie, KONG Qing-mei. Research on schemes of shield direct cutting launching[J]. Journal of Lanzhou University of Technology, 2024, 50(3): 130-136.

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