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隧道建设(中英文) ›› 2023, Vol. 43 ›› Issue (2): 273-284.DOI: 10.3973/j.issn.2096-4498.2023.02.009

• 研究与探索 • 上一篇    下一篇

暗挖隧道空间网架混凝土初期支护受力特性研究

宋远1, 2, 黄明利2, 张旭东3, 李然4   

  1. (1. 安徽理工大学土木建筑学院, 安徽 淮南 232001 2. 北京交通大学 城市地下工程教育部重点实验室, 北京 100044; 3. 中铁十一局集团有限公司, 湖北 武汉 430061; 4. 中铁四局集团有限公司, 安徽 合肥 230023)

  • 出版日期:2023-02-20 发布日期:2023-03-22
  • 作者简介:宋远(1991—),男,安徽安庆人,2022年毕业于北京交通大学,土木工程专业,博士,讲师,主要从事隧道与地下工程方面的教学与科研工作。 Email: 18115036@bjtu.edu.cn。

Mechanical Characteristics of Spatial Reticulated Grid Concrete Primary Support in Mined Tunnel

SONG Yuan1, 2, HUANG Mingli2, ZHANG Xudong3, LI Ran4   

  1. (1.School of Civil Engineering and Architecture,Anhui University of Science and Technology,Huainan 232001,Anhui,China;2.Key Laboratory for Urban Underground Engineering of the Ministry of Education,Beijing Jiaotong University, Beijing 100044,China;3.China Railway 11th Bureau Group Corporation Limited, Wuhan 430061,Hubei,China;4.China Tiesiju Civil Engineering Group Co.,Ltd.,Hefei 230023,Anhui,China)

  • Online:2023-02-20 Published:2023-03-22

摘要: 为解决城市软弱围岩浅埋暗挖隧道在施工过程中容易出现支护不及时、支护强度不足的问题,采用数值模拟和室内模型试验相结合的方法,对空间网架锚喷支护作用原理、承载力学特性展开研究,提出及时形成强力支护、实时承担围岩荷载的“及时高强支护”理念,创新性地设计出装配式空间网架支护结构及节点形式,建立高强度空间网架锚喷支护体系。结果表明: 1)采用高强度的空间网架结构作为隧道初期支护,有利于改善应力应变状态,提高结构整体承载性能; 2)在压弯荷载作用下,上主肢钢管受压率先进入屈服破坏,螺栓端板节点构件较无节点构件表现出更高的承载力及抗弯刚度; 3)关于变形破坏模式,螺栓端板节点混凝土构件表现为跨中区域竖向裂纹发展破坏,无节点混凝土构件呈现出大范围的裂纹扩展规律; 4)〖JP2〗无节点混凝土构件具有较好的可变形能力,其极限承载力约为螺栓端板节点混凝土构件的1.2倍,而螺栓端板节点混凝土构件的抗弯刚度较高,对变形的控制效果更好。

关键词:

暗挖隧道, 装配式空间网架, 及时高强支护, 数值模拟, 室内足尺试验

Abstract:

To address the untimely and inadequate support strengths in shallowlyburied mined tunnels in soft surrounding rocks in urban settings, numerical simulation and indoor model tests are introduced to investigate the principle of a spatial reticulated grid boltshotcrete support and the mechanical characteristics of bearing capacity. Simultaneously, the concept of timely highstrength support is proposed to form a strong support in a timely manner that bears the load of surrounding rocks in real time. Moreover, the prefabricated spatial reticulated grid support structure and joint type are designed innovatively, and a highstrength spatial reticulated grid boltshotcrete support system  is established. The results reveal the following: (1) The use of a highstrength spatial reticulated grid as the primary support of the tunnel is convenient for improving the stress state and the overall bearing capacity of the structure. (2) When subjected to compression and bending loads, the upper main leg steel tube first experiences yield failure, and the bolted endplate joint component demonstrates higher bearing capacity and bending stiffness than the jointless component. (3) In terms of failure modes, the concrete component with the bolted endplate joints shows a vertical crack development in the midspan region, whereas the concrete component without joints shows a larger range of crack development. (4) The concrete component without joints has good deformability, and its ultimate bearing capacity is 1.2 times that of the concrete component with the bolted endplate joints. However, the bending stiffness of the concrete components with the bolted endplate joints is higher, and the deformation control effect is better.

Key words:  mined tunnel; prefabricated spatial reticulated grid, timely highstrength support, numerical simulation, indoor fullscale test