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A Coupled Thermal–Hydrological–Mechanical Damage Model and Its Numerical Simulations of Damage Evolution in APSE

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Centre for Rock Instability and Seismicity Research, School of Resource and Civil Engineering, Northeastern University, Shenyang 110819, China
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Faculty of Geosciences and Environmental Engineering, Southwest Jiaotong University, Chengdu 611756, China
3
Deep Earth Energy Laboratory, Monash University, Clayton, VIC 3800, Australia
*
Author to whom correspondence should be addressed.
Academic Editor: Thomas Fiedler
Materials 2016, 9(11), 841; https://doi.org/10.3390/ma9110841
Received: 20 August 2016 / Revised: 5 October 2016 / Accepted: 11 October 2016 / Published: 31 October 2016
This paper proposes a coupled thermal–hydrological–mechanical damage (THMD) model for the failure process of rock, in which coupling effects such as thermally induced rock deformation, water flow-induced thermal convection, and rock deformation-induced water flow are considered. The damage is considered to be the key factor that controls the THM coupling process and the heterogeneity of rock is characterized by the Weibull distribution. Next, numerical simulations on excavation-induced damage zones in Äspö pillar stability experiments (APSE) are carried out and the impact of in situ stress conditions on damage zone distribution is analysed. Then, further numerical simulations of damage evolution at the heating stage in APSE are carried out. The impacts of in situ stress state, swelling pressure and water pressure on damage evolution at the heating stage are simulated and analysed, respectively. The simulation results indicate that (1) the v-shaped notch at the sidewall of the pillar is predominantly controlled by the in situ stress trends and magnitude; (2) at the heating stage, the existence of confining pressure can suppress the occurrence of damage, including shear damage and tensile damage; and (3) the presence of water flow and water pressure can promote the occurrence of damage, especially shear damage. View Full-Text
Keywords: rock damage; thermal–hydrological–mechanical (THM); Äspö pillar stability experiments (APSE); numerical simulation rock damage; thermal–hydrological–mechanical (THM); Äspö pillar stability experiments (APSE); numerical simulation
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Wei, C.; Zhu, W.; Chen, S.; Ranjith, P.G. A Coupled Thermal–Hydrological–Mechanical Damage Model and Its Numerical Simulations of Damage Evolution in APSE. Materials 2016, 9, 841.

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