Study on Mechanical Effect of Backfill Construction in Orthogonal Underpass Section of an Open-Cut Interchange Tunnel

Authors

LI Qingda, YCIC Highway Construction Co ., Ltd., Kunming , Yunnan 650100 , ChinaFollow
LI Dexing, Yunnan Jiaofa Highway Engineering Co ., Ltd., Kunming , Yunnan 650100 , China
YU Tingshun, Yunnan Jiaofa Highway Engineering Co ., Ltd., Kunming , Yunnan 650100 , China
HAN Xi, School of Civil Engineering , Chongqing Jiaotong University , Chongqing 400074 , ChinaFollow
LIU Jiansong, Southwest Construction Co ., Ltd., China Railway 24th Bureau Group Corporation Limited , Chengdu , Sichuan 610000 , China

Corresponding Author

韩西，男，博士，教授.E-mail：xihan@cqjtu.edn.cn

Abstract

This study investigated the mechanical effects of backfill construction in the orthogonal underpass section of a full-section complex open-cut interchange tunnel.The research was based on the small-clear-distance interchange tunnel project at the extension section of Jinzhou Avenue and Xingguang Avenue in Chongqing.A combined approach of numerical simulation and on-site in-situ test measurement was adopted to analyze the influence of different backfill materials,tunnel cross-section types,and complex construction procedures on the mechanical behavior of the underpass tunnel.The mechanical effects of backfill construction in the orthogonal underpass section were determined.The following findings are revealed:During the backfill construction process,the displacement and internal force of the underpass tunnel increase gradually,with abrupt changes occurring at the end stages of the overlaying tunnel construction and the lateral backfilling.Significant stress changes are observed at the haunches and footings of the underpass tunnel.Subsequently,replacing the interface fill with C 15 concrete forms a stable composite system between the upper and lower tunnels,effectively inhibiting drastic stress fluctuations in these critical zones.The displacement and internal force of the underpass tunnel structure exhibit longitudinal maxima,extending from the intersection interface toward the adjacent section.Upon completion of construction,the peak values of displacement and internal force are transmitted from the intersection interface to the longitudinal adjacent section at y = 6 m.

Publication Date

8-15-2025

DOI

10.14048/j.issn.1671-2579.2025.04.023

First Page

184

Last Page

196

Submission Date

August 2025

Recommended Citation

Qingda, LI; Dexing, LI; Tingshun, YU; Xi, HAN; and Jiansong, LIU (2025) "Study on Mechanical Effect of Backfill Construction in Orthogonal Underpass Section of an Open-Cut Interchange Tunnel," Journal of China & Foreign Highway: Vol. 45: Iss. 4, Article 23.
DOI: 10.14048/j.issn.1671-2579.2025.04.023
Available at: https://zwgl1980.csust.edu.cn/journal/vol45/iss4/23

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