Experimental and numerical investigation of the rheological characteristics of tunnels in cold regions during excavation and operation

被引：11
作者：
Zhang, Jiabing [1 ,2 ]
Du, Ronghuan [1 ]
Zhang, Xiaohu [1 ]
Wu, Jun [3 ]
Xiang, Xu [1 ]
机构：
[1] Guangxi Univ, Sch Civil Engn & Architecture, Nanning 530004, Peoples R China
[2] Guangxi Univ, State Key Lab Featured Met Mat & Life cycle Safety, Nanning 530004, Peoples R China
[3] China State Construct Engn Corp, Beijing 100029, Peoples R China
来源：
ACTA GEOTECHNICA | 2024年 / 19卷 / 04期
基金：
中国国家自然科学基金;
关键词：
F-T cycle; Fractional order; Numerical simulation; Sandstone; Triaxial creep; TRANSVERSELY ISOTROPIC ROCKS; TIME-DEPENDENT BEHAVIOR; CREEP MODEL; STRENGTH; DAMAGE;
D O I：
10.1007/s11440-023-02026-9
中图分类号：
P5 [地质学];
学科分类号：
0709 ; 081803 ;
摘要：
An understanding of the rheological characteristics of surrounding rock is key to predicting the large deformations of tunnels in soft rock in cold regions, particularly due to freeze-thaw (F-T) damage of the surrounding rock. Therefore, in this study, a series of F-T cycle and triaxial creep tests of surrounding rocks were conducted on the basis of typical tunnel projects in cold regions, and the parameters of the test data were identified by the fractional-order creep damage constitutive equation. Then, a constitutive model was embedded into the Fast Lagrangian Analysis of Continua in 3 Dimensions software to analyze the coupled creep deformations of the surrounding rock and supporting structure in response to F-T cycles while excavating the Ningchan tunnel. The calculated results accurately reflected the creep deformation characteristics of the surrounding monitoring points after tunnel excavation under different numbers of F-T cycles. Finally, a tunnel operation model was derived and used to analyze the creep deformation characteristics of a tunnel during operation in a cold area. The calculation results showed that with increasing time, the lining structure and surrounding rock at different monitoring points in the tunnel underwent various degrees of creep deformation. Additionally, the creep deterioration effect of the surrounding rock was more severe after the F-T cycles, which endangered traffic safety.
引用
收藏
页码：1943 / 1964
页数：22
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