[1]许江波,李 强,刘一凡,等.基底泥岩非均匀膨胀作用的隧道仰拱变形规律分析[J].长安大学学报(自然科学版),2025,45(01):102-113.[doi:10.19721/j.cnki.1671-8879.2025.01.009]
　XU Jiang-bo,LI Qiang,LIU Yi-fan,et al.Analysis of deformation law of tunnel inverted arch under non-uniform expansion of base mudstone[J].Journal of Chang’an University (Natural Science Edition),2025,45(01):102-113.[doi:10.19721/j.cnki.1671-8879.2025.01.009]
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基底泥岩非均匀膨胀作用的隧道仰拱变形规律分析()
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长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]

卷:
第45卷
期数:
2025年01期
页码:
102-113
栏目:
桥梁与隧道工程
出版日期:
2025-02-28

文章信息/Info

Title:
Analysis of deformation law of tunnel inverted arch under non-uniform expansion of base mudstone
文章编号:
1671-8879(2025)01-0102-12
作者:
许江波1; 李 强1; 刘一凡1; 程芳卉2; 林晋海2; 陈绍华2; 詹皓辰2
(1. 长安大学 公路学院,陕西 西安 710064; 2. 中铁第一勘察设计院集团有限公司,陕西 西安 710043)
Author(s):
XU Jiang-bo1;  LI Qiang1;  LIU Yi-fan1;  CHENG Fang-hui2;  LIN Jin-hai2; CHEN Shao-hua2;  ZHAN Hao-chen2
(1. School of Highway, Chang'an University, Xi'an 710064, Shaanxi, China; 2. China Railway First Survey and Design Institute Group Co. Ltd., Xi'an 710043, Shaanxi, China)
关键词:
隧道工程;  仰拱底鼓;  数值模拟;  变形规律
Keywords:
tunnel engineering;  inverted arch bottom drum;  numerical simulation;  deformation law
分类号:
U451
DOI:
10.19721/j.cnki.1671-8879.2025.01.009
文献标志码:
A
摘要:
泥岩隧道仰拱在运营过程中常发生变形问题,基底围岩吸水膨胀后将直接影响仰拱的受力状态。为探究基底围岩非均匀膨胀作用下隧道仰拱的受力变形规律,依托兰新(兰州—新疆)高速铁路线路中的SJZ隧道,采用有限元软件ABAQUS对该泥岩隧道仰拱底鼓过程进行数值建模分析,采用热力学等效体积膨胀模拟基底围岩的不均匀膨胀,并结合现场围岩勘探数据和道面上拱监测数据,分析隧道仰拱底部病害的受力变形特征。研究结果表明:隧道仰拱结构的受力变形呈集中变化现象,隧道中部变形最大,并且向两端断面逐渐减小,隧道回填层表面的内力由膨胀中心区域向四周逐渐降低,仰拱底鼓量最大为28.2 mm,最大主应力为2.2 MPa,此时达到混凝土极限拉伸状态,导致隧道仰拱开裂; 隧道仰拱不均匀底鼓与基底膨胀性围岩分布相关,围岩破碎引起的体积膨胀是导致隧道仰拱底鼓的主要原因; 隧道仰拱在不均匀底鼓过程中,中心断面的最大主应力左侧为正,右侧为负,说明仰拱填充表面左侧受拉,右侧受压; 仰拱回填层横向的竖向变形分为3段,靠近膨胀中心的轨道上方为主底鼓区,区内底鼓量基本一致,两侧底鼓为伴随性底鼓,且隧道底鼓量由中心沿两侧递减。研究结果可为泥岩隧道仰拱施工设计优化提供理论依据与技术参考。
Abstract:
During the operation of mudstone tunnels, deformation issues are often experienced bythe inverted arch, and the stress state of the inverted arch is directly affected by the expansion ofthe base surrounding rock resulting from water absorption. To explore the stress-deformation lawof the tunnel inverted arch under the expansion of the base surrounding rock, based on the SJZtunnel of the Lanzhou-Xinjiang High-speed Railway, finite element software ABAQUS was usedto numerically model and analyzed the process of bottom heave of the mudstone tunnel invertedarch. The thermodynamic equivalent volume expansion model was used to simulate the non-uniform expansion of the base rock mass, and combined with on-site rock exploration data andarch monitoring data on the track surface, the stress and deformation characteristics of the tunnelarch bottom disease were analyzed. The results show that the stress anddeformation of the tunnel arch structure exhibit a concentrated variation phenomenon, with thedeformation in the middle of the tunnel being the largest and gradually decreasing towards the twoend sections. The internal force on the surface of the tunnel backfill layer gradually decreasesfrom the expansion center area to the surrounding areas. The maximum deformation amount of thearch bottom is 28.2 mm, and the maximum principal stress is 2.2 MPa. At this point, the concretereaches the ultimate tensile state, leading to cracking of the tunnel arch. The uneven bottomheave of the tunnel arch is related to the distribution of expansive surrounding rock at the base,and the volume expansion caused by rock fragmentation is the main reason for the bottom heaveof the tunnel arch. During the uneven bottom heaving process of the tunnel arch, the maximumprincipal stress on the center section is positive on the left and negative on the right, indicatingthat the filling surface of the arch is under tension on the left and compression on the right. The horizontal vertical deformation of the backfill layer of the inverted arch is divided into threesections. The area above the track near the expansion center is the main bottom heave zone, wherethe amount of bottom heave is basically the same. The other two sections are accompanied bybottom heave, and the tunnel bottom heave decreases from the center along both sides. Theresearch results can be provided as a theoretical basis and technical reference for the optimizationof the construction design of the inverted arch in mudstone tunnels.1 tab, 22 figs, 31 refs.

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备注/Memo

备注/Memo:
收稿日期:2024-10-02
基金项目:青海省基础研究计划项目(2019-ZJ-7050)
作者简介:许江波(1985-),男,河南林州人,副教授,博士研究生导师,E-mail:xujiangbo@yeah.net。
更新日期/Last Update: 2025-02-25