1. Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering, Hohai University, Nanjing 210098, China 2. College of Civil and Transportation Engineering, Hohai University, Nanjing 210098, China 3. Key Laboratory of Ministry of Education on Safe Mining of Deep Metal Mines, College of Resources and Civil Engineering, Northeastern University, Shenyang 110819, China 4. Department of Civil and Mineral Engineering, University of Toronto, Toronto M5S1A1, Canada
The thermomechanical coupling of rocks refers to the interaction between the mechanical and thermodynamic behaviors of rocks induced by temperature changes. The study of this coupling interaction is essential for understanding the mechanical and thermodynamic properties of the surrounding rocks in underground engineering. In this study, an improved temperature-dependent linear parallel bond model is introduced under the framework of a particle flow simulation. A series of numerical thermomechanical coupling tests are then conducted to calibrate the micro-parameters of the proposed model by considering the mechanical behavior of the rock under different thermomechanical loadings. Good agreement between the numerical results and experimental data are obtained, particularly in terms of the compression, tension, and elastic responses of granite. With this improved model, the thermodynamic response and underlying cracking behavior of a deep-buried tunnel under different thermal loading conditions are investigated and discussed in detail.
coefficient of linear thermal expansion α (10−5 °C−1)
1.8
1.9
1.1
5.2
specific heat Cv (J/(kg·°C))
1015
1015
1015
1015
thermal resistance η (°C·W−1)
1.84
0.30
2.30
0.23
Tab.4
Fig.8
Fig.9
Fig.10
Fig.11
Fig.12
Fig.13
Fig.14
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