Open Access
ARTICLE
Experimental Simulation and Numerical Modeling of Deformation and Damage Evolution of Pre-Holed Sandstones After Heat Treatment
Shuo Yang1, Yuanhai Li1, 2, ∗, Xiaojie Tang1, 2, Jinshan Liu1, 2
1 State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology, Xuzhou, China.
2 School of Mechanics and Civil Engineering, China University of Mining and Technology, Xuzhou, China.
∗ Corresponding Author: Yuanhai Li. Email: Lyh@cumt.edu.cn.
(This article belongs to the Special Issue: Modeling and Simulation of Fluid flows in Fractured Porous Media: Current Trends and Prospects)
Computer Modeling in Engineering & Sciences 2020, 122(2), 633-659. https://doi.org/10.32604/cmes.2020.07919
Received 10 July 2019; Accepted 25 September 2019; Issue published 01 February 2020
Abstract
The deformation and damage evolution of sandstone after heat treatment greatly
influence the efficient and safe development of deep geothermal energy extraction. To
investigate this issue, laboratory confined compression tests and numerical simulations
were conducted on pre-holed sandstone specimens after heat treatment. The laboratory test
results show that the failure modes are closely related to the heat treatment temperature,
with increasing treatment temperature, the failure modes change from mixed and shear
modes to a splitting mode. The cracks always initiate from the sidewalls of the hole and
then propagate. The failure process inside the hole proceeds as follows: calm period,
particle ejection period, rock fragment exfoliation period and rock failure period. The
specimens have different final failure features for the entire rock after heat treatment, but
have the same failure features inside the hole. These phenomena can be explained by
numerical simulations. The numerical simulations reveal that the failure modes in the
numerical results agree very well with those observed in the experimental results. The
damage zone always occurs at sidewalls of the hole and then propagates to the entire rock
affected by shear or tensile damage. From 20°C to 200°C, thermal effect may promote
shear damage and restrain tensile damage, while from 200°C to 800°C, thermal effect
promotes tensile damage and restrains shear damage. Notably, the damage zone near the
sidewalls of the hole has the same distribution range and pattern. Finally, the differences
in the mechanisms due to increasing heat temperature are evaluated using scanning electron
microscope (SEM) observations.
Keywords
Cite This Article
Yang, S., Li, Y., Tang, X., Liu, J. (2020). Experimental Simulation and Numerical Modeling of Deformation and Damage Evolution of Pre-Holed Sandstones After Heat Treatment.
CMES-Computer Modeling in Engineering & Sciences, 122(2), 633–659. https://doi.org/10.32604/cmes.2020.07919
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