|Table of Contents|

Rheological and damage characteristics of tunnel surrounding rock in cold regions during operation(PDF)

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

Issue:
2025年4期
Page:
81-94
Research Field:
桥梁与隧道工程
Publishing date:

Info

Title:
Rheological and damage characteristics of tunnel surrounding rock in cold regions during operation
Author(s):
ZHANG Jia-bing1; 2;  LI Zhen1; 2;  DU Rong-huan1; 2;  ZHAO Xiang-lian1; 2;  XIANG Xu1; 2
(1. School of Civil Engineering and Architecture, Guangxi University, Nanning 530004, Guangxi, China; 2. Key Laboratory of Disaster Prevention and Structural Safety of Ministry of Education,Guangxi University, Nanning 530004, Guangxi, China)
Keywords:
tunnel in cold region;  sandstone;  freeze-thaw cycle;  triaxial creep test;  fractional order;  numerical simulation
PACS:
U451
DOI:
10.19721/j.cnki.1671-8879.2025.04.007
Abstract:
To deeply study the rheological and damage characteristics of surrounding rock under freeze-thaw cycles and predict the deformation of soft rock tunnels in cold regions during operation, a series of sandstone freeze-thaw cycles and triaxial creep tests were carried out based on a typical tunnel project in cold regions. The influence of freeze-thaw cycle number on creep characteristics of sandstone was analyzed, and the whole process curves of sandstone creep under confining pressures of3 and 6 MPa and freeze-thaw cycles of 0, 20, 40 and 60 times were obtained. Based on the fractional derivative theory, the fractional creep damage model was derived to reflect the creep characteristics of sandstone in different creep stages during different freeze-thaw cycles, and parameters in the fractional creep damage constitutive equation were determined according to the test data. The constitutive model was embedded into the FLAC3D software to analyze the long-term stabilities of tunnel surrounding rock and supporting structure under the coupling effect of freeze-thaw cycles and long-term load. The research results show that the greater the freeze-thaw cycle number, the greater the instantaneous elastic deformation, attenuation creep and stable creep rates of sandstone under the same long-term load, and the smaller the long-term load level can be borne. The error between the on-site monitoring data and the model calculation results is 8.45%, verifying the reliability of the secondary development model. With the increase in freeze-thaw cycle number, the creep effects of tunnel surrounding rock and supporting structure are more serious during operation, and the overall performance is rheological deformation in the tunnel, among which the deformations of vault and arch bottom are the most obvious. After 60 freeze-thaw cycles, the maximum horizontal and vertical displacements of tunnel support structure increase by 2.68 and 2.07 times, respectively, indicating that the freeze-thaw cycles seriously affect the long-term stability and safe operation of the tunnel compared with those without considering the freeze-thaw effect.4 tabs, 17 figs, 34 refs.

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Last Update: 2025-07-25