Analysis on Deformation Law of Double Side Extra Large Deep Foundation Pit Excavation in Existing Turning Area Tunnels

SUN Yangjun; JIA Fei; LI Weijie; SHI Lin; HE Yanwei; QIN Xingchun; JIANG Jianhui; LI Shiyu

doi:10.3724/j.gyjzG23062103

Volume 55 Issue 11

Nov. 2025

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Article Navigation > INDUSTRIAL CONSTRUCTION > 2025 > 55(11): 195-203

SUN Yangjun, JIA Fei, LI Weijie, SHI Lin, HE Yanwei, QIN Xingchun, JIANG Jianhui, LI Shiyu. Analysis on Deformation Law of Double Side Extra Large Deep Foundation Pit Excavation in Existing Turning Area Tunnels[J]. INDUSTRIAL CONSTRUCTION, 2025, 55(11): 195-203. doi: 10.3724/j.gyjzG23062103

Citation:

SUN Yangjun, JIA Fei, LI Weijie, SHI Lin, HE Yanwei, QIN Xingchun, JIANG Jianhui, LI Shiyu. Analysis on Deformation Law of Double Side Extra Large Deep Foundation Pit Excavation in Existing Turning Area Tunnels[J]. INDUSTRIAL CONSTRUCTION, 2025, 55(11): 195-203. doi: 10.3724/j.gyjzG23062103

Citation:

SUN Yangjun, JIA Fei, LI Weijie, SHI Lin, HE Yanwei, QIN Xingchun, JIANG Jianhui, LI Shiyu. Analysis on Deformation Law of Double Side Extra Large Deep Foundation Pit Excavation in Existing Turning Area Tunnels[J]. INDUSTRIAL CONSTRUCTION, 2025, 55(11): 195-203. doi: 10.3724/j.gyjzG23062103

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Analysis on Deformation Law of Double Side Extra Large Deep Foundation Pit Excavation in Existing Turning Area Tunnels

doi: 10.3724/j.gyjzG23062103

1. SCEGC Mechanized Construction Group Company Ltd., Xi'an 710000, China;
2. SCEGC Foundation Construction Engineering Group Company Ltd., Xi'an 710000, China;
3. School of Resource and Civil Engineering, Northeastern University, Shenyang 110819, China

Received Date: 2023-06-21
Available Online: 2026-01-06
Publish Date: 2025-11-20

Abstract

Abstract

To clarify the deformation laws of excavation and support of super deep foundation pits on both sides of existing tunnel turning areas in loess areas. Based on the third phase expansion project of Xi’an Xianyang International Airport， this paper conducts a numerical simulation analysis of the whole process of foundation pit excavation， and deeply explores the influence of the excavation of super deep foundation pit in the loess area on the foundation pit side wall， the existing turning tunnel and the surface deformation. Through research， it was found that： 1） the horizontal and vertical displacements of the lining structure exhibit the characteristics of “large front and small rear”， and the deformation of the lining structure in the bending direction is relatively large； 2） the deformation of the side wall of the foundation pit diffuses radially from the top of the far corner to the connection direction of the slurry wall； 3） as the distance along the tunnel increases， the deformation curve of the upper surface of the lining structure changes from a “U” shape to a “W” shape. 4） during the construction process， it is important to focus on monitoring the lining structure in the bending direction， the deformation of the far end top of the corner， and the difference in surface deformation near the foundation pit.
- extra-large deep foundation pit,
- tunnel turning,
- foundation pit deformation,
- surface deformation,
- loess region

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References(21)

References

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