首页|大断面隧道初期支护中纵向连接与拱架联合承载效应

大断面隧道初期支护中纵向连接与拱架联合承载效应

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针对大断面隧道初期支护拱架在承载时易发生平面外失稳的问题，本文通过开展单拱架全比尺试验和考虑纵向连接的拱框架结构的数值试验以及现场对比试验，对纵向连接与拱架组成的拱框架结构进行优化研究，使其横向上有足够承载能力、纵向上有较高稳定性。研究结果表明，单个拱架的破坏模式是局部面外失稳导致整体承载力丧失，考虑纵向连接的拱框架结构的平面内承载力和平面外稳定性都得到增强。通过调整纵向连接间距和拱架间距也可以调整初期支护拱框架结构和喷射混凝土的内力分担比，以充分发挥初期支护的承载能力，但纵向连接间距应小于1500 mm，拱架间距也应小于1200 mm。因而，在不改变初期支护现有结构形式的前提下，通过合理地布设纵向连接与拱架形成的具有空间承载效应的拱框架结构，不仅可以保证初期支护的承载能力，而且还提高施工效率和经济效益。研究成果可指导大断面隧道初期支护结构设计。
Bearing effect of arched frame structures with longitudinal connections in large-section tunnels
Aiming to improving the out-of-plane instability of I-steel arches in large-section tunnels,this study conducted the full-scale test of a single arch,the numerical test of the arched frame structures formed by the longitudinal connections and the arches,and the field comparison test.The results indicated that the failure mode of the single arch was local out-of-plane instability,leading to a loss of overall bearing capacity.The in-plane bearing capacity and out-of-plane stability of arched frame structures considering longitudinal connection bearing capacity are enhanced.In addition,the bearing capacity of the primary support can be fully utilized by adjusting the longitudinal connection spacing and the arch spacing to improve the internal force sharing ratio of the arched frame structure and the shotcrete.However,the longitudinal connection spacing should be less than 1500 mm,and the arch spacing should be less than 1200 mm.Therefore,without changing the existing structural form of the primary support,the arched frame structures with spatial bearing effect formed by rationally arranged longitudinal connections and arches can not only ensure the bearing capacity of the primary support,but also improve construction efficiency and economic benefits.The research findings can guide the structural design of primary support for large-section tunnels.

large-section tunnelsprimary supportarched frame structuresarcheslongitudinal connectionsbearing effect

陈红宾、江贝、蒋宇静、陈清作、王强勋

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Graduate School of Engineering,Nagasaki University,Nagasaki 852-8521,Japan

Research Center of Geotechnical and Structural Engineering,Shandong University,Ji'nan 250061,China

State Key Laboratory for Tunnel Engineering,China University of Mining and Technology-Beijing,Beijing 100083,China

CSCEC City Construction Development Co.,Ltd.,Beijing 100037,China

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大断面隧道 初期支护 拱框架结构 拱架 纵向连接 承载效应

国家重点研发计划国家自然科学基金国家自然科学基金山东省自然科学基金中央高校基本科研业务费专项

2023YFC29076004227717442077267ZR2020JQ232022JCCXSB03

2024

10.1007/s11771-024-5569-8

中南大学学报(英文版)
中南大学

中南大学学报(英文版)

CSTPCDEI
影响因子：0.47
ISSN：2095-2899
年,卷(期)：2024.31(2)
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