Journal of Jilin University(Engineering and Technology Edition) ›› 2025, Vol. 55 ›› Issue (10): 3262-3273.doi: 10.13229/j.cnki.jdxbgxb.20231438

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Shear deformation and failure characteristics of precast utility tunnel joints by foundation

Chao ZHANG1,2(),Zheng-rong ZHAO1,2,You-jun XU1,2,Xu-zhi NIE1,2   

  1. 1.School of Civil Engineering，Inner Mongolia University of Science and Technology，Baotou 014010，China
    2.Research Center of Urban Underground Engineering at Universities of Inner Mongolia，Baotou 014010，China
  • Received:2023-12-25 Online:2025-10-01 Published:2026-02-03

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Abstract:

In order to obtain the shear deformation law and failure characteristics of precast utility tunnel joints under different foundations， this paper comprehensively considers the influence of the structural characteristics of utility tunnel joints and the foundation， and reveals the influence of foundation conditions on the shear performance of utility tunnel joints through model tests. The results show that the socket joints of the precast utility tunnel with connectors have good ductility and can meet the requirements of use when the utility tunnel is subjected to shear load under gravelly sand， silty clay and clay foundations. When the utility tunnel bears the same load， with the increase of the foundation stiffness， the dislocation of the utility tunnel will decrease， but the damage range of the joint will expand and the damage will be more serious， the final joint damage area accounts for about 15 % of the whole utility tunnel. The bearing end of the joint is more seriously damaged than the socket end， and the cracks in the chamfer position， near the bolt hole and at the top and the bottom are the most concentrated. It is recommended to strengthen the above positions locally. With the increase of dislocation， the longitudinal connector has gradually become the main force component of the joint to resist shear deformation， which plays an important role in improving the shear capacity of the joint and the integrity of the joint.

Key words: bridge and tunnel engineering, precast utility tunnel, joint, model test, shear performance

CLC Number: 

  • U451

Fig.1

Structure of utility tunnel joints（unit： mm）"

Fig.2

Cross-section size of utility tunnel （unit： mm）"

Fig.3

Utility tunnel reinforcement（unit： mm）"

Table 1

Physical and mechanical parameters for each material"

力学参数混凝土（C50）

钢筋

（HRB400）

高强螺杆

（?12）

重度/（kN·m-3）25.078.578.5
泊松比0.20.30.28
弹性模量/MPa34 500200 000165 000
屈服强度/MPa—400850
抗压强度标准值/MPa32.4——
抗拉强度标准值/MPa2.55401 050

Fig.4

Test device"

Fig.5

Layout of measuring points"

Fig.6

Layout form of springs（unit： mm）"

Table 2

Test conditions"

工况等效地基

等效地基刚度系数/

103（kN·m-3）

底板面积/m2弹簧数量/个
CD-1砾砂地基5.42.899
CD-2粉质黏土地基3.62.896
CD-3黏土地基2.42.894

Fig.7

Concrete damage of utility tunnel joints"

Fig.8

Deformation of longitudinal connectors"

Fig.9

Dislocation deformation of utility tunnel"

Fig.10

Variation law of joint concrete strain under different stratum conditions"

Fig.11

Strain variation law of longitudinal connectors under different stratum conditions"

Fig.12

Shear-dislocation curve of joint"

Table 3

Joint ductility coefficient"

地基Δy/mmΔu/mmμ
砾砂2.312.15.3
粉质黏土2.915.15.2
黏土3.815.74.1
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