|Table of Contents|

Analysis of deformation law of tunnel inverted arch under non-uniform expansion of base mudstone(PDF)

长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]

Issue:
2025年01期
Page:
102-113
Research Field:
桥梁与隧道工程
Publishing date:

Info

Title:
Analysis of deformation law of tunnel inverted arch under non-uniform expansion of base mudstone
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)
Keywords:
tunnel engineering;  inverted arch bottom drum;  numerical simulation;  deformation law
PACS:
U451
DOI:
10.19721/j.cnki.1671-8879.2025.01.009
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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Last Update: 2025-02-25