[1]张军,麻建飞,刘夏冰,等.浅埋超大跨隧道洞口段围岩稳定性研究[J].高速铁路技术,2023,14(06):7-12，18.[doi:10.12098/j.issn.1674-8247.2023.06.002]
　ZHANG Jun,MA Jianfei,LIU Xiabing,et al.A Study on Rock Stability in Portal Section of Shallow Extra-large-span Tunnel[J].HIGH SPEED RAILWAY TECHNOLOGY,2023,14(06):7-12，18.[doi:10.12098/j.issn.1674-8247.2023.06.002]
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浅埋超大跨隧道洞口段围岩稳定性研究()
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《高速铁路技术》[ISSN:1674-8247/CN:51-1730/U]

卷:
14卷
期数:
2023年06期
页码:
7-12，18
栏目:
理论探索
出版日期:
2023-12-30

文章信息/Info

Title:
A Study on Rock Stability in Portal Section of Shallow Extra-large-span Tunnel
文章编号:
1674-8247（2023）06-0007-06
作者:
张军1; 麻建飞2; 刘夏冰2; 3; 吴瑞2; 王胜虎1
1.中铁大桥局集团第四工程有限公司，南京210031;2.北京交通大学，北京 100044;3.广东华路交通科技有限公司， 广州 510420
Author(s):
ZHANG Jun1; MA Jianfei2; LIU Xiabing2; 3; WU Rui2; WANG Shenghu1
1.The Fourth Engineering Co. ，Ltd. of China Railway Major Bridge Engineering Group Co. ，Ltd. ， Nanjing 210031 ，China;2.Beijing Jiaotong University ，Beijing 100044 ，China;3.Guangdong Hualu Transport Technology Co. ，Ltd. ，Guangzhou 510420 ，China
关键词:
浅埋超大跨隧道; 洞口段; 围岩稳定性; 监控量测
Keywords:
shallow extra-large-span tunnel; portal section; rock stability; monitoring measurement
分类号:
U451.2
DOI:
10.12098/j.issn.1674-8247.2023.06.002
文献标志码:
A
摘要:
为保证浅埋超大跨高速铁路隧道洞口段施工稳定性，采用数值模拟和现场实测研究了浅埋超大跨高速铁路隧道洞口段施工时的围岩稳定性，结果表明：（1）浅埋超大跨隧道洞口段施工时中导洞核心土的开挖是控制围岩变形的关键工序，洞口段偏压会导致围岩拱脚局部应力集中；（2）施工引起的围岩沉降大致分为左右导洞开挖阶段、中导洞核心土开挖阶段和拆撑阶段，其中，中导洞核心土开挖30d内是施工危险期；（3）洞口段采用的超前大管棚、超前小导管、超前预应力锚杆等措施，成功解决了洞口段围岩变形控制困难的问题，拱顶沉降最大值为34.5mm，水平收敛最大值为12.5mm。研究成果可为类似浅埋超大跨山岭隧道施工提供参考。
Abstract:
In order to ensure the stability of construction in the portal section of a shallow extra-large-span tunnel of high-speed railway，numerical simulations，and on-site measurements were conducted to study the rock stability during the construction of the tunnel portal. The results indicate the following：（1）Excavation of the core soil of the center pilot tunnel is the critical process for controlling rock deformation during the construction of the portal section of the shallow extra-large-span tunnel. Imbalanced pressure at the portal section can cause localized stress concentration in the rock arch springing. （2）The rock settlement caused by construction can be roughly divided into three stages：the excavation of the left and right pilot tunnels，the excavation of the core soil of the center pilot tunnel，and the dismantling of supports. Among them，the first 30 days after the excavation of the core soil of the center pilot tunnel represent a critical period for construction. （3）Measures such as advanced large pipe sheds，advanced small guide pipes，and advanced pre-stressed anchor rods used at the tunnel portals have successfully addressed the difficulty of controlling the rock deformation. The maximum settlement at the crown is 34. 5 mm，and the maximum horizontal convergence is 12. 5 mm. The findings can provide a reference for the construction of similar shallow extra-large-span mountain tunnels.

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备注/Memo

备注/Memo:
收稿日期：2022-09-05
作者简介：张军（1983-），男，工程师。
基金项目：中铁大桥局集团第四工程有限公司资助基金项目（CL19048530）
更新日期/Last Update: 2023-12-30