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New Construction Technology of a Shallow Tunnel in Boulder-Cobble Mixed Grounds by Liu, Tong; Zhong, Yujian; Feng, Zhihua; Xu, Wei; Song, Feiting; Li, Chenghan is a Engineering article available to read on EtoBox.

What is New Construction Technology of a Shallow Tunnel in Boulder-Cobble Mixed Grounds about?

As a typical granular bulk medium, problems are common in boulder-cobble mixed grounds, such as easy collapse and instability and difficult effective support for large-section tunnel excavation. Tunnels constructed in BCM grounds are rare still, and there is a big gap between the design and construction of tunnels. Based on the Nianggaicun highway tunnel crossing the BCM grounds, the construction technology of tunnel in BCM grounds is studied by means of literature investigation and field survey. Here are the main conclusions: the overall deformation of surrounding rock is quite small; the pressure distribution of surrounding rock is small and loose pressure is dominant, and the safety reserve of secondary lining is large. The deformation process of surrounding rock concentrates on the construction stage. During the construction process, there are many problems, such as serious overexcavation, difficulty of bolt penetration, and continuous rock fall. In this paper, a three-bench complementary cyclic excavation method is proposed, which replaces the original CD and CRD methods. Meanwhile, the supporting system is optimized. The results show that the disturbance of surrounding rock i

Who reads New Construction Technology of a Shallow Tunnel in Boulder-Cobble Mixed Grounds?

Author

Liu, Tong; Zhong, Yujian; Feng, Zhihua; Xu, Wei; Song, Feiting; Li, Chenghan

Publisher

Hindawi Limited; Hindawi Publishing Corporation; New York NY: Hindawi Publ.; London: Hindawi (ISSN 1687-8086)

Published

2020

Language

EN

Field

Engineering (Physical Sciences)