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Experimental and numerical investigation of the rheological characteristics of tunnels in cold regions during excavation and operation
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.
Experimental and numerical investigation of the rheological characteristics of tunnels in cold regions during excavation and operation
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.
Experimental and numerical investigation of the rheological characteristics of tunnels in cold regions during excavation and operation
Acta Geotech.
Zhang, Jiabing (author) / Du, Ronghuan (author) / Zhang, Xiaohu (author) / Wu, Jun (author) / Xiang, Xu (author)
Acta Geotechnica ; 19 ; 1943-1964
2024-04-01
22 pages
Article (Journal)
Electronic Resource
English
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