Analysis of Excavation Face Stability and Influencing Factors of Shield Tunnel in Double-layer Strata

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Analysis of Excavation Face Stability and Influencing Factors of Shield Tunnel in Double-layer Strata

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[1]ZHANG Yamin,SHEN Xiaoqiu,LI Fengwei,et al.Analysis of Excavation Face Stability and Influencing Factors of Shield Tunnel in Double-layer Strata[J].Journal of Zhengzhou University (Engineering Science),2026,47(XX):1-9.[doi:10.13705/j.issn.1671-6833.2025.05.022]

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Journal of Zhengzhou University (Engineering Science)[ISSN 1671-6833/CN 41-1339/T] Volume: 47 Number of periods: 2026 XX Page number: 1-9 Column: Public date: 2026-09-10

Title:: Analysis of Excavation Face Stability and Influencing Factors of Shield Tunnel in Double-layer Strata

Author(s):: ZHANG Yamin¹; 3 ; SHEN Xiaoqiu¹; 2 ; LI Fengwei¹; 2 ; ZHENG Yuanxun¹; 2 ; Grzegorz Ludwik Golewski⁴; 1. National Key Laboratory of Tunnel Boring Machine and Intelligent Operation and Maintenance, Zhengzhou University, Zhengzhou 450001, China; 2. School of Water Conservancy and Transportation, Zhengzhou University , Zhengzhou 450001, China; 3 . Technology Patent Search Station, Zhengzhou University, Zhengzhou 450001, China; 4. Department of Structural Engineering, Faculty of Civil Engineering and Architecture, Lublin University of Technology, Nadbystrzycka 40 Str. , Lublin 20-618, Poland

Keywords:: shield tunnel; double-layer strata; excavation face stability; numerical simulation; sensitivity analysis

CLC:: U451TU91

DOI:: 10.13705/j.issn.1671-6833.2025.05.022

Abstract:: To investigate the instability mechanism of tunnel excavation faces in double-layer strata under seepage conditions and its impact on the safety of shield construction, a systematic study was conducted on the stability of excavation faces in a seepage-stratum coupled environment. First, refined numerical models of two typical stratum conditions—upper-hard and lower-soft strata and upper-soft and lower-hard strata—were established based on the FLAC3D finite difference software. Next, the influence mechanisms of the burial depth ratio, soil internal friction angle, cohesion, groundwater level difference, and stratum interface position on the ultimate support pressure of the shield excavation face were analyzed using the numerical models. Finally, the gray correlation analysis method was introduced to evaluate and rank the sensitivity of these five influencing factors, thereby quantitatively revealing the degree and differences of their impacts on the stability of the shield excavation face. The research results indicated that under composite stratum conditions, the stability of the excavation face was primarily controlled by the strength of the lower stratum, with the influence of the upper strata being only 40.1% (upper-hard and lower-soft strata) and 32.5% (upper-soft and lower-hard strata) of that of the lower stratum. The sensitivity ranking of the influencing factors was as follows: groundwater level>soil strength>burial depth ratio>stratum interface position.

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Last Update: 2026-01-16