Experimental and simulation study on tensile mechanical characteristics and crack development law of sandstone after thermal treatment
The thermal damage caused by high temperature will accelerate the deterioration of rock mechanical properties, affecting the stability of surrounding rock in underground engineering. For further explore the tensile mechanical properties and crack development law of rock after thermal treatment, Braz...
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| Language: | English |
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Elsevier
2025-03-01
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| Series: | Journal of Materials Research and Technology |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2238785425002005 |
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| author | Jing Yang Sheng-Qi Yang Guang-Jian Liu Bo-Wen Sun Wen-Ling Tian Jin-Zhou Tang |
| author_facet | Jing Yang Sheng-Qi Yang Guang-Jian Liu Bo-Wen Sun Wen-Ling Tian Jin-Zhou Tang |
| author_sort | Jing Yang |
| collection | DOAJ |
| description | The thermal damage caused by high temperature will accelerate the deterioration of rock mechanical properties, affecting the stability of surrounding rock in underground engineering. For further explore the tensile mechanical properties and crack development law of rock after thermal treatment, Brazilian splitting test and Three-Dimensional Particle Flow Code (PFC3D) numerical simulation of sandstone after thermal treatment at 25 °C–900 °C were carried out. Based on scanning electron microscopy (SEM), X-ray diffraction (XRD) tests, it is determined that the thermal cracks in the rock show the characteristics of ''disorderly distribution, centralized development, a large number of microcracks develop to form penetration trend, and local penetration to form complex crack network''. By using image threshold segmentation to quantitatively analyze the high temperature thermal damage, it is determined that the high temperature thermal damage presents the characteristics of ''slow increase, rapid increase''. With the increase of thermal treatment temperature, the tensile strength gradually decreases, and the peak displacement gradually increases. The thermal decomposition of kaolinite at 450 °C is the turning point of accelerated deterioration of sandstone mechanical properties. High temperature will increase the internal strain concentration factor and range to accelerate the crack growth. PFC3D numerical results show that high temperature will promote the generation of shear cracks, resulting in the formation of more complex three-dimensional crack penetration network. The type and distribution characteristics of mineral composition and the thermal expansion characteristics of mineral crystals are the main controlling factors for the difference of initial thermal damage, and the penetration of thermal cracks and loading cracks under external force is the direct cause of rock strength instability, which can provide help for the stability of deep underground engineering. |
| format | Article |
| id | doaj-art-85a4f43720294813820cf4738595d583 |
| institution | Kabale University |
| issn | 2238-7854 |
| language | English |
| publishDate | 2025-03-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Journal of Materials Research and Technology |
| spelling | doaj-art-85a4f43720294813820cf4738595d5832025-02-02T05:27:39ZengElsevierJournal of Materials Research and Technology2238-78542025-03-013526172636Experimental and simulation study on tensile mechanical characteristics and crack development law of sandstone after thermal treatmentJing Yang0Sheng-Qi Yang1Guang-Jian Liu2Bo-Wen Sun3Wen-Ling Tian4Jin-Zhou Tang5State Key Laboratory of Digital and Intelligent Technology for Unmanned Coal Mining, Anhui University of Science and Technology, Huainan, 232001, PR ChinaKey Laboratory of Rock Mechanics and Geohazards of Zhejiang Province, School of Civil Engineering, Shaoxing University, Shaoxing, 312000, PR ChinaInstitute of Rock Mechanics, Ningbo University, Ningbo, 315211, PR ChinaState Key Laboratory of Intelligent Construction and Healthy Operation and Maintenance of Deep Underground Engineering, China University of Mining and Technology, Xuzhou, 221116, PR ChinaSchool of Mechanics and Civil Engineering, China University of Mining and Technology, Xuzhou, 221116, PR ChinaSchool of Mining Engineering, Anhui University of Science and Technology, Huainan, 232001, PR China; Corresponding author.The thermal damage caused by high temperature will accelerate the deterioration of rock mechanical properties, affecting the stability of surrounding rock in underground engineering. For further explore the tensile mechanical properties and crack development law of rock after thermal treatment, Brazilian splitting test and Three-Dimensional Particle Flow Code (PFC3D) numerical simulation of sandstone after thermal treatment at 25 °C–900 °C were carried out. Based on scanning electron microscopy (SEM), X-ray diffraction (XRD) tests, it is determined that the thermal cracks in the rock show the characteristics of ''disorderly distribution, centralized development, a large number of microcracks develop to form penetration trend, and local penetration to form complex crack network''. By using image threshold segmentation to quantitatively analyze the high temperature thermal damage, it is determined that the high temperature thermal damage presents the characteristics of ''slow increase, rapid increase''. With the increase of thermal treatment temperature, the tensile strength gradually decreases, and the peak displacement gradually increases. The thermal decomposition of kaolinite at 450 °C is the turning point of accelerated deterioration of sandstone mechanical properties. High temperature will increase the internal strain concentration factor and range to accelerate the crack growth. PFC3D numerical results show that high temperature will promote the generation of shear cracks, resulting in the formation of more complex three-dimensional crack penetration network. The type and distribution characteristics of mineral composition and the thermal expansion characteristics of mineral crystals are the main controlling factors for the difference of initial thermal damage, and the penetration of thermal cracks and loading cracks under external force is the direct cause of rock strength instability, which can provide help for the stability of deep underground engineering.http://www.sciencedirect.com/science/article/pii/S2238785425002005Tensile mechanicsCrack developmentThermal damagePFC3D numerical simulation |
| spellingShingle | Jing Yang Sheng-Qi Yang Guang-Jian Liu Bo-Wen Sun Wen-Ling Tian Jin-Zhou Tang Experimental and simulation study on tensile mechanical characteristics and crack development law of sandstone after thermal treatment Journal of Materials Research and Technology Tensile mechanics Crack development Thermal damage PFC3D numerical simulation |
| title | Experimental and simulation study on tensile mechanical characteristics and crack development law of sandstone after thermal treatment |
| title_full | Experimental and simulation study on tensile mechanical characteristics and crack development law of sandstone after thermal treatment |
| title_fullStr | Experimental and simulation study on tensile mechanical characteristics and crack development law of sandstone after thermal treatment |
| title_full_unstemmed | Experimental and simulation study on tensile mechanical characteristics and crack development law of sandstone after thermal treatment |
| title_short | Experimental and simulation study on tensile mechanical characteristics and crack development law of sandstone after thermal treatment |
| title_sort | experimental and simulation study on tensile mechanical characteristics and crack development law of sandstone after thermal treatment |
| topic | Tensile mechanics Crack development Thermal damage PFC3D numerical simulation |
| url | http://www.sciencedirect.com/science/article/pii/S2238785425002005 |
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