Tensile strength and fracture behaviors of granite specimens after thermal treatment: Experimental and GBM numerical insights
During geothermal exploitation of deep hot dry rocks (HDR), high-temperature reservoirs cool when exposed to water, potentially altering rock properties and fracture characteristics. To investigate the mechanical properties and fracture behaviors of granites under different cooling methods, granite...
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Elsevier
2025-05-01
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| Series: | Journal of Materials Research and Technology |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2238785425008981 |
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| author | Yan-Hua Huang Hao Yin Sheng-Qi Yang Gan Feng Ming-Xu Li Kun-Bo Zhang Wen-Ling Tian |
| author_facet | Yan-Hua Huang Hao Yin Sheng-Qi Yang Gan Feng Ming-Xu Li Kun-Bo Zhang Wen-Ling Tian |
| author_sort | Yan-Hua Huang |
| collection | DOAJ |
| description | During geothermal exploitation of deep hot dry rocks (HDR), high-temperature reservoirs cool when exposed to water, potentially altering rock properties and fracture characteristics. To investigate the mechanical properties and fracture behaviors of granites under different cooling methods, granite samples were treated with natural cooling (NC) and water cooling (WC). Brazilian splitting tests were then performed to study the evolution of tensile strength with the change of temperature and cooling methods. 3D scans of fracture surfaces were employed to calculate roughness coefficients, correlating them with tensile strength. SEM observations revealed the thermal fracture mechanism, including thermal cracks, grain size, and water-induced weakening. A numerical model based on digital image processing (DIP) and the grain-based model (GBM) was developed, with coefficients of thermal expansion of different minerals incorporated. Simulated results closely matched the Brazilian test results. Tensile strength decreased significantly with temperature, with reductions of 25.6 %, 37.7 %, 70.7 %, and 73.8 % for NC conditions, while 30.6 %, 43.7 %, 81.1 %, and 84.2 % for WC conditions when the temperature rises from 200 °C to 800 °C compared to room temperature. The roughness of fracture surfaces increased with temperature, with maximum increases of 64.2 % and enhanced roughness at 800 °C. These findings offer insights into damage and fracture mechanisms in HDR reservoirs during geothermal exploitation. |
| format | Article |
| id | doaj-art-e19a12b0fb0844a5991d251699ada779 |
| institution | OA Journals |
| issn | 2238-7854 |
| language | English |
| publishDate | 2025-05-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Journal of Materials Research and Technology |
| spelling | doaj-art-e19a12b0fb0844a5991d251699ada7792025-08-20T02:17:29ZengElsevierJournal of Materials Research and Technology2238-78542025-05-01364083409710.1016/j.jmrt.2025.04.077Tensile strength and fracture behaviors of granite specimens after thermal treatment: Experimental and GBM numerical insightsYan-Hua Huang0Hao Yin1Sheng-Qi Yang2Gan Feng3Ming-Xu Li4Kun-Bo Zhang5Wen-Ling Tian6State Key Laboratory of Intelligent Construction and Healthy Operation and Maintenance of Deep Underground Engineering, School of Mechanics and Civil Engineering, China University of Mining and Technology, Xuzhou, Jiangsu, 221116, China; Key Laboratory of Rock Mechanics and Geohazards of Zhejiang Province, School of Civil Engineering, Shaoxing University, Shaoxing, Zhejiang, 312000, ChinaState Key Laboratory of Intelligent Construction and Healthy Operation and Maintenance of Deep Underground Engineering, School of Mechanics and Civil Engineering, China University of Mining and Technology, Xuzhou, Jiangsu, 221116, ChinaKey Laboratory of Rock Mechanics and Geohazards of Zhejiang Province, School of Civil Engineering, Shaoxing University, Shaoxing, Zhejiang, 312000, China; Corresponding author.State Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan University, Chengdu, 610065, ChinaState Key Laboratory of Intelligent Construction and Healthy Operation and Maintenance of Deep Underground Engineering, School of Mechanics and Civil Engineering, China University of Mining and Technology, Xuzhou, Jiangsu, 221116, ChinaState Key Laboratory of Intelligent Construction and Healthy Operation and Maintenance of Deep Underground Engineering, School of Mechanics and Civil Engineering, China University of Mining and Technology, Xuzhou, Jiangsu, 221116, ChinaState Key Laboratory of Intelligent Construction and Healthy Operation and Maintenance of Deep Underground Engineering, School of Mechanics and Civil Engineering, China University of Mining and Technology, Xuzhou, Jiangsu, 221116, ChinaDuring geothermal exploitation of deep hot dry rocks (HDR), high-temperature reservoirs cool when exposed to water, potentially altering rock properties and fracture characteristics. To investigate the mechanical properties and fracture behaviors of granites under different cooling methods, granite samples were treated with natural cooling (NC) and water cooling (WC). Brazilian splitting tests were then performed to study the evolution of tensile strength with the change of temperature and cooling methods. 3D scans of fracture surfaces were employed to calculate roughness coefficients, correlating them with tensile strength. SEM observations revealed the thermal fracture mechanism, including thermal cracks, grain size, and water-induced weakening. A numerical model based on digital image processing (DIP) and the grain-based model (GBM) was developed, with coefficients of thermal expansion of different minerals incorporated. Simulated results closely matched the Brazilian test results. Tensile strength decreased significantly with temperature, with reductions of 25.6 %, 37.7 %, 70.7 %, and 73.8 % for NC conditions, while 30.6 %, 43.7 %, 81.1 %, and 84.2 % for WC conditions when the temperature rises from 200 °C to 800 °C compared to room temperature. The roughness of fracture surfaces increased with temperature, with maximum increases of 64.2 % and enhanced roughness at 800 °C. These findings offer insights into damage and fracture mechanisms in HDR reservoirs during geothermal exploitation.http://www.sciencedirect.com/science/article/pii/S2238785425008981GraniteHigh temperatureWater coolingTensile strengthFracture roughnessDIP-GBM |
| spellingShingle | Yan-Hua Huang Hao Yin Sheng-Qi Yang Gan Feng Ming-Xu Li Kun-Bo Zhang Wen-Ling Tian Tensile strength and fracture behaviors of granite specimens after thermal treatment: Experimental and GBM numerical insights Journal of Materials Research and Technology Granite High temperature Water cooling Tensile strength Fracture roughness DIP-GBM |
| title | Tensile strength and fracture behaviors of granite specimens after thermal treatment: Experimental and GBM numerical insights |
| title_full | Tensile strength and fracture behaviors of granite specimens after thermal treatment: Experimental and GBM numerical insights |
| title_fullStr | Tensile strength and fracture behaviors of granite specimens after thermal treatment: Experimental and GBM numerical insights |
| title_full_unstemmed | Tensile strength and fracture behaviors of granite specimens after thermal treatment: Experimental and GBM numerical insights |
| title_short | Tensile strength and fracture behaviors of granite specimens after thermal treatment: Experimental and GBM numerical insights |
| title_sort | tensile strength and fracture behaviors of granite specimens after thermal treatment experimental and gbm numerical insights |
| topic | Granite High temperature Water cooling Tensile strength Fracture roughness DIP-GBM |
| url | http://www.sciencedirect.com/science/article/pii/S2238785425008981 |
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