Numerical study of the effect of infilling material in a hole-like flaw on acoustic emission characteristics and damage evolution in sandstone
Per-existing flaws are wide existence in rock mass, which have a significant effect on mechanical properties and fracturing behaviors. To investigate the effects of flaw type, infilling material, and flaw shape on the mechanical properties and fracture evolution of rock, a series of uniaxial compres...
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Frontiers Media S.A.
2023-01-01
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| Series: | Frontiers in Earth Science |
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| Online Access: | https://www.frontiersin.org/articles/10.3389/feart.2022.992206/full |
| _version_ | 1828072042418667520 |
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| author | Qi Zhang Qi Zhang Qi Zhang Chun-Chi Ma Yalong Jiang Yalong Jiang Huale Geng |
| author_facet | Qi Zhang Qi Zhang Qi Zhang Chun-Chi Ma Yalong Jiang Yalong Jiang Huale Geng |
| author_sort | Qi Zhang |
| collection | DOAJ |
| description | Per-existing flaws are wide existence in rock mass, which have a significant effect on mechanical properties and fracturing behaviors. To investigate the effects of flaw type, infilling material, and flaw shape on the mechanical properties and fracture evolution of rock, a series of uniaxial compression tests were conducted on sandstone specimens. The bonded-particle model (BPM) and acoustic emission (AE) techniques were adopted to study the cracking process and AE characteristics of sandstone. The results indicate that relatively rigid infilling can significantly improve the mechanical properties of the rock. The AE simulation in the BPM revealed its fracture evolution, and there is a good consistency between fracture evolution and AE events. The cracking process and crack type around the hole-like flaw are influenced by the type of infilling material and its shape due to changes in the stress state around the hole-like flaw. Tensile cracks in nature usually initiate from the top or the bottom of a hole-like flaw. The shear and compaction cracks in nature prefer to initiate within the infilling material or from the lateral sides of the hole-like flaw. The cracking process of rocks can be characterized by the b-value, the variation of which is comparable with fracture behaviors and energy dissipation. |
| first_indexed | 2024-04-11T01:03:03Z |
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| id | doaj.art-63a68f4d2a8747e0b60ab6292e68e443 |
| institution | Directory Open Access Journal |
| issn | 2296-6463 |
| language | English |
| last_indexed | 2024-04-11T01:03:03Z |
| publishDate | 2023-01-01 |
| publisher | Frontiers Media S.A. |
| record_format | Article |
| series | Frontiers in Earth Science |
| spelling | doaj.art-63a68f4d2a8747e0b60ab6292e68e4432023-01-04T14:43:25ZengFrontiers Media S.A.Frontiers in Earth Science2296-64632023-01-011010.3389/feart.2022.992206992206Numerical study of the effect of infilling material in a hole-like flaw on acoustic emission characteristics and damage evolution in sandstoneQi Zhang0Qi Zhang1Qi Zhang2Chun-Chi Ma3Yalong Jiang4Yalong Jiang5Huale Geng6State Key Laboratory of Geohazard Prevention and Geoenvironment Protection, Chengdu University of Technology, Chengdu, ChinaThe Key Laboratory of Safety for Geotechnical and Structural Engineering of Hubei Province, School of Civil Engineering, Wuhan University, Wuhan, ChinaState Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, Wuhan, ChinaState Key Laboratory of Geohazard Prevention and Geoenvironment Protection, Chengdu University of Technology, Chengdu, ChinaSchool of Civil Engineering and Architecture, East China Jiaotong University, Nanchang, ChinaJiangxi Key Laboratory of Infrastructure Safety and Control in Geotechnical Engineering, Nanchang, ChinaHuaneng Coal Industry Co., Ltd., Beijing, ChinaPer-existing flaws are wide existence in rock mass, which have a significant effect on mechanical properties and fracturing behaviors. To investigate the effects of flaw type, infilling material, and flaw shape on the mechanical properties and fracture evolution of rock, a series of uniaxial compression tests were conducted on sandstone specimens. The bonded-particle model (BPM) and acoustic emission (AE) techniques were adopted to study the cracking process and AE characteristics of sandstone. The results indicate that relatively rigid infilling can significantly improve the mechanical properties of the rock. The AE simulation in the BPM revealed its fracture evolution, and there is a good consistency between fracture evolution and AE events. The cracking process and crack type around the hole-like flaw are influenced by the type of infilling material and its shape due to changes in the stress state around the hole-like flaw. Tensile cracks in nature usually initiate from the top or the bottom of a hole-like flaw. The shear and compaction cracks in nature prefer to initiate within the infilling material or from the lateral sides of the hole-like flaw. The cracking process of rocks can be characterized by the b-value, the variation of which is comparable with fracture behaviors and energy dissipation.https://www.frontiersin.org/articles/10.3389/feart.2022.992206/fullbonded-particle modelacoustic emissionopening hole-like flawfilled hole-like flawuniaxial compression test |
| spellingShingle | Qi Zhang Qi Zhang Qi Zhang Chun-Chi Ma Yalong Jiang Yalong Jiang Huale Geng Numerical study of the effect of infilling material in a hole-like flaw on acoustic emission characteristics and damage evolution in sandstone Frontiers in Earth Science bonded-particle model acoustic emission opening hole-like flaw filled hole-like flaw uniaxial compression test |
| title | Numerical study of the effect of infilling material in a hole-like flaw on acoustic emission characteristics and damage evolution in sandstone |
| title_full | Numerical study of the effect of infilling material in a hole-like flaw on acoustic emission characteristics and damage evolution in sandstone |
| title_fullStr | Numerical study of the effect of infilling material in a hole-like flaw on acoustic emission characteristics and damage evolution in sandstone |
| title_full_unstemmed | Numerical study of the effect of infilling material in a hole-like flaw on acoustic emission characteristics and damage evolution in sandstone |
| title_short | Numerical study of the effect of infilling material in a hole-like flaw on acoustic emission characteristics and damage evolution in sandstone |
| title_sort | numerical study of the effect of infilling material in a hole like flaw on acoustic emission characteristics and damage evolution in sandstone |
| topic | bonded-particle model acoustic emission opening hole-like flaw filled hole-like flaw uniaxial compression test |
| url | https://www.frontiersin.org/articles/10.3389/feart.2022.992206/full |
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