Study on Adaptability and Construction Technology of Compound TBM in Soil-Rock Mixture Backfill Area

Wang Senjian; Wang Jiwen; Zhong Zuliang; Zhou Jihu; Duan Wanglong

doi:10.20174/j.JUSE.2025.04.27

Chinese Journal of Underground Space and Engineering >

2025 , Vol. 21 >Issue 4: 1352 - 1362

DOI: https://doi.org/10.20174/j.JUSE.2025.04.27

Study on Adaptability and Construction Technology of Compound TBM in Soil-Rock Mixture Backfill Area

Wang Senjian ,
Wang Jiwen ,
Zhong Zuliang ,
Zhou Jihu ,
Duan Wanglong

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1. China Railway First Bureau Group Fourth Engineering Co., Ltd., Chongqing 400045, P.R. China;
2. School of Civil Engineering, Chongqing University, Chongqing 400045, P.R. China;
3. National Joint Engineering Research Center of Geohazards Prevention in the Reservoir Areas, Chongqing 400045, P.R. China

Received date: 2024-08-15

Online published: 2025-09-03

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Abstract

The section between Wangjiacheng Station and Shengjipu Station of Chongqing Line 4 needs to pass through 3 sections of newly filled soil-rock mixture. Due to the loose structure, poor uniformity, large voids, insufficient consolidation and low shear strength of the newly filled soil-rock mixture, tunnel construction is prone to cause significant ground settlement. The applicability and construction technology of compound TBM in soil-rock mixture backfill area are summarized in this paper. The results show that: Pre-reinforcement via surface sleeve-valve grouting (pressure: 0.1~0.3 MPa) enhances soil strength (unconfined compressive strength ≥1.2 MPa) and density (shear wave velocity ≥300 m/s); “Low penetration + high rotation” mode (advance rate ≤30 mm/min, cutterhead rotation 0.8~1.0 r/min) with strict control of muck discharge (72.46 m³/ring) and synchronous grouting volume (6.66~11.1 m³/ring) is adopted; Large boulders (≤300 mm) are fragmented by hydraulic splitting. Numerical analysis identified backfill depth and grouting range as dominant settlement factors and the area for surface pre-grouting reinforcement is suggested to expand to the sides of the arch rib by 1.0D. The measurement results show that this technology has controlled the surface subsidence to 24 mm (below the warning value of 30 mm), and the subsidence of the tunnel arch top and the net clearance convergence are below the design limits.

Key words： tunnel engineering; compound TBM; soil-rock mixture backfill; construction technology

Cite this article

Wang Senjian , Wang Jiwen , Zhong Zuliang , Zhou Jihu , Duan Wanglong . Study on Adaptability and Construction Technology of Compound TBM in Soil-Rock Mixture Backfill Area[J]. Chinese Journal of Underground Space and Engineering, 2025 , 21(4) : 1352 -1362 . DOI: 10.20174/j.JUSE.2025.04.27

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