单线重载铁路隧道复合式衬砌结构优化研究

梅竹

doi:10.3973/j.issn.2096-4498.2021.09.014

隧道建设 >

2021 , Vol. 41 >Issue 9: 1547 - 1554

DOI: https://doi.org/10.3973/j.issn.2096-4498.2021.09.014

规划与设计

单线重载铁路隧道复合式衬砌结构优化研究

梅竹

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（中铁第四勘察设计院集团有限公司，湖北武汉 430063）

梅竹（1987—），男，湖北黄梅人，2008年毕业于华东交通大学，土木工程专业，本科，高级工程师，现从事隧道设计及科研工作。E-mail： 253178331@qq.com。

网络出版日期: 2021-10-01

基金资助

中国铁路总公司科技研究开发计划课题（2014G005-A）

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Optimization of Composite Lining Structure of a SingleTrack HeavyHaul Railway Tunnel

MEI Zhu

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(China Railway Siyuan Survey and Design Institute Group Co., Ltd., Wuhan 430063, Hubei, China)

Online published: 2021-10-01

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摘要

为给出更优的重载铁路隧道复合式衬砌设计方案，结合现场测试与数值模拟，对蒙华单线重载铁路隧道复合式衬砌结构设计进行优化分析。通过在试验段衬砌结构埋设应变计、应力计等监测元件对混凝土和格栅钢架进行监控量测，利用有限元软件模拟隧道开挖支护过程，对比分析了不同工况下初期支护结构的变形和内力，评价了结构安全性。研究发现: Ⅳ级围岩单线隧道采用台阶法施工时，1)初期支护闭合前拱顶有上移现象； 2）初期支护内力以轴力（压力）为主； 3）相应弯矩值较小，由喷射混凝土+钢架的结合体共同承担，占70%～90%； 4）格栅钢架加密降低了喷射混凝土荷载承担比例，提高了衬砌的安全性。

关键词： 重载铁路隧道; 复合式衬砌; 数值模拟; 监控量测; 台阶法; 衬砌优化

本文引用格式

梅竹 . 单线重载铁路隧道复合式衬砌结构优化研究[J]. 隧道建设, 2021 , 41(9) : 1547 -1554 . DOI: 10.3973/j.issn.2096-4498.2021.09.014

Abstract

In order to determine a better solution for composite lining design of heavyhaul railway tunnels, the composite lining structure design of a singletrack heavyhaul tunnel on the Menghua railway is optimized and analyzed by using a field test and a numerical simulation method. The concrete and the grid steel frame are monitored and measured using embedded strain and stress gauges in the lining structure of the test section. The tunnel excavation support process is simulated using finite element software. In addition, the deformation and the internal force of the primary support structure under different working conditions are analyzed to evaluate the structural safety. The results show that: when the singletrack tunnel in Grade Ⅳ surrounding rock is constructed, (1) using the bench method, the crown moves upward before the primary support is closed; (2)the internal force of the primary support is mainly the axial force (pressure); (3) the corresponding bending moment shared by the shotcrete and the steel frame is relatively small, accounting for approximately 70% to 90%; and (4) the densification of the steel grid truss reduces the shotcrete load proportion and improves its safety.

Key words： heavy-haul railway tunnel; composite lining; numerical simulation; monitoring measurement; bench method; lining optimization

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