Section Form of Open-Cut Tunnel by Ultra-Large-Diameter Shield Empty-Push Technology

Authors

SUN Chao, China Railway Liuyuan Group Co ., Ltd., Tianjin 300308 , ChinaFollow
ZHANG Guangwei, China Railway Liuyuan Group Co ., Ltd., Tianjin 300308 , ChinaFollow

Abstract

Based on the engineering background of the open-cut section by the shield machine with overall movement in the rapid transformation project of Wanghai Road,Shenzhen City,the structural stress and economy of three types of section forms under construction and operation conditions were analyzed to determine the optimal section design.The load-structure model was used to analyze the parameters affecting the internal force of the optimal section.The research results show that the top and bottom plates and side walls in the scheme with ribs set at the corner (scheme 3) have uniform force,and force during the construction period is close to that during the operation period.The scheme has the most economic and reasonable structural forms and is the optimal one.Setting uplift piles on the bottom plate solves the problem of anti-floating problem of tunn el structure,reduces the bending moment of the bottom plate,and optimizes the force conditions of the bottom plate.Under constant rib spacing,as the rib size gradually increases,the bending moment of the tunnel top plate support and mid-span position gradually decreases.The length and width of the rib have a more significant impact on the force on the top plate than the thickness of the rib.The optimal rib size is 6 m × 6 m × 1 m.

Publication Date

2-22-2025

DOI

10.14048/j.issn.1671-2579.2025.01.025

First Page

204

Last Page

211

Submission Date

March 2025

Recommended Citation

Chao, SUN and Guangwei, ZHANG (2025) "Section Form of Open-Cut Tunnel by Ultra-Large-Diameter Shield Empty-Push Technology," Journal of China & Foreign Highway: Vol. 45: Iss. 1, Article 25.
DOI: 10.14048/j.issn.1671-2579.2025.01.025
Available at: https://zwgl1980.csust.edu.cn/journal/vol45/iss1/25

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