地基对预制综合管廊接头剪切变形及破坏特征的影响

doi:10.13229/j.cnki.jdxbgxb.20231438

摘要/Abstract

摘要：

为获得不同地基条件下预制综合管廊接头的剪切变形规律及破坏特征，本文综合考虑管廊接头构造特征与地基的影响，通过模型试验，揭示地基条件对管廊接头抗剪性能的影响规律。研究结果表明：在砾砂、粉质黏土、黏土地基下，管廊承受剪切荷载时，带连接件预制综合管廊的承插式接头均具有较好的延性，能够满足使用要求；当管廊承受相同荷载时，随着地基刚度的增大，管节的错台量会减小，但接头的破坏范围扩大，破坏更严重，最终接头损伤区域约占管廊整体的15%；接头的承口端比插口端破坏严重，倒角位置、螺栓孔附近及顶板与底板处的裂缝最为集中，建议对这些位置进行局部加强；随着错台量的增大，纵向连接件逐渐成为接头抵抗剪切变形的主要受力构件，在提高接头抗剪能力及接头整体性方面发挥了重要作用。

关键词: 桥梁与隧道工程, 预制综合管廊, 接头, 模型试验, 抗剪性能

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

中图分类号:

U451

张朝,赵峥嵘,许有俊,聂绪致. 地基对预制综合管廊接头剪切变形及破坏特征的影响[J]. 吉林大学学报(工学版), 2025, 55(10): 3262-3273.

Chao ZHANG,Zheng-rong ZHAO,You-jun XU,Xu-zhi NIE. Shear deformation and failure characteristics of precast utility tunnel joints by foundation[J]. Journal of Jilin University(Engineering and Technology Edition), 2025, 55(10): 3262-3273.

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力学参数	混凝土（C50）	钢筋（HRB400）	高强螺杆（?12）
重度/（kN·m^-3）	25.0	78.5	78.5
泊松比	0.2	0.3	0.28
弹性模量/MPa	34 500	200 000	165 000
屈服强度/MPa	—	400	850
抗压强度标准值/MPa	32.4	—	—
抗拉强度标准值/MPa	2.5	540	1 050

地基	Δ_y/mm	Δ_u/mm	μ
砾砂	2.3	12.1	5.3
粉质黏土	2.9	15.1	5.2
黏土	3.8	15.7	4.1