Effects of varying loading rates on the Brazilian splitting characteristics of coal-rock composites
ObjectivesTo investigate the tensile characteristics of coal-rock composite structures during the mining process， the study takes coal-rock composite specimens as the research object.MethodsBrazilian splitting tests were conducted on coal-rock composite specimens under varying loading rates using th...
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Academic Publishing Center of HPU
2025-01-01
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| Series: | 河南理工大学学报. 自然科学版 |
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| Online Access: | http://xuebao.hpu.edu.cn/info/11196/95998.htm |
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| author | CHEN Yan WANG Jiahao DENG Liangtao HONG Zijie RONG Tenglong HOU Zhiqiang |
| author_facet | CHEN Yan WANG Jiahao DENG Liangtao HONG Zijie RONG Tenglong HOU Zhiqiang |
| author_sort | CHEN Yan |
| collection | DOAJ |
| description | ObjectivesTo investigate the tensile characteristics of coal-rock composite structures during the mining process， the study takes coal-rock composite specimens as the research object.MethodsBrazilian splitting tests were conducted on coal-rock composite specimens under varying loading rates using the RMT150B testing machine. The effects of loading rates on the strength characteristics， failure modes， energy features， and crack evolution during splitting failure were analyzed.ResultsThe stress-strain curves of the coal-rock composites generally followed four stages： compaction， elasticity， yield， and failure. The fai-lure mode was independent of the loading rate， with all specimens splitting along the interface of the disks. The tensile strength of the composite increased with loading rate， showing significant changes under low loading rates， while the rate of increase diminished as the loading rate became higher. The energy concentration in coal-rock composite specimens ranged from 0.33 J to 0.42 J， and higher tensile strength required greater energy for failure. The stress-crack strain curve exhibited three stages before the peak： crack closure， elasticity， and crack propagation. The crack parameters demonstrated a pronounced dependency on loading rates.ConclusionsThese findings provide valuable theoretical insights into the tensile failure mechanism of coal-rock composite structures. |
| format | Article |
| id | doaj-art-4fa9f81380254f129cac057a9bdfbe0c |
| institution | OA Journals |
| issn | 1673-9787 |
| language | zho |
| publishDate | 2025-01-01 |
| publisher | Academic Publishing Center of HPU |
| record_format | Article |
| series | 河南理工大学学报. 自然科学版 |
| spelling | doaj-art-4fa9f81380254f129cac057a9bdfbe0c2025-08-20T02:08:43ZzhoAcademic Publishing Center of HPU河南理工大学学报. 自然科学版1673-97872025-01-01441293610.16186/j.cnki.1673-9787.20231000271673-9787（2025）1-29-8Effects of varying loading rates on the Brazilian splitting characteristics of coal-rock compositesCHEN Yan0WANG Jiahao1DENG Liangtao2HONG Zijie3RONG Tenglong4HOU Zhiqiang5School of Energy Science and Engineering， Henan Polytechnic University， Jiaozuo 454000， Henan， ChinaSchool of Energy Science and Engineering， Henan Polytechnic University， Jiaozuo 454000， Henan， ChinaSchool of Energy Science and Engineering， Henan Polytechnic University， Jiaozuo 454000， Henan， ChinaSchool of Civil Engineering， Henan Polytechnic University， Jiaozuo 454000， Henan， ChinaSchool of Energy Science and Engineering， Henan Polytechnic University， Jiaozuo 454000， Henan， ChinaSchool of Energy Science and Engineering， Henan Polytechnic University， Jiaozuo 454000， Henan， ChinaObjectivesTo investigate the tensile characteristics of coal-rock composite structures during the mining process， the study takes coal-rock composite specimens as the research object.MethodsBrazilian splitting tests were conducted on coal-rock composite specimens under varying loading rates using the RMT150B testing machine. The effects of loading rates on the strength characteristics， failure modes， energy features， and crack evolution during splitting failure were analyzed.ResultsThe stress-strain curves of the coal-rock composites generally followed four stages： compaction， elasticity， yield， and failure. The fai-lure mode was independent of the loading rate， with all specimens splitting along the interface of the disks. The tensile strength of the composite increased with loading rate， showing significant changes under low loading rates， while the rate of increase diminished as the loading rate became higher. The energy concentration in coal-rock composite specimens ranged from 0.33 J to 0.42 J， and higher tensile strength required greater energy for failure. The stress-crack strain curve exhibited three stages before the peak： crack closure， elasticity， and crack propagation. The crack parameters demonstrated a pronounced dependency on loading rates.ConclusionsThese findings provide valuable theoretical insights into the tensile failure mechanism of coal-rock composite structures.http://xuebao.hpu.edu.cn/info/11196/95998.htmcoal-rock compositesbrazilian splittingstrength characteristicsenergy featurescrack evolution |
| spellingShingle | CHEN Yan WANG Jiahao DENG Liangtao HONG Zijie RONG Tenglong HOU Zhiqiang Effects of varying loading rates on the Brazilian splitting characteristics of coal-rock composites 河南理工大学学报. 自然科学版 coal-rock composites brazilian splitting strength characteristics energy features crack evolution |
| title | Effects of varying loading rates on the Brazilian splitting characteristics of coal-rock composites |
| title_full | Effects of varying loading rates on the Brazilian splitting characteristics of coal-rock composites |
| title_fullStr | Effects of varying loading rates on the Brazilian splitting characteristics of coal-rock composites |
| title_full_unstemmed | Effects of varying loading rates on the Brazilian splitting characteristics of coal-rock composites |
| title_short | Effects of varying loading rates on the Brazilian splitting characteristics of coal-rock composites |
| title_sort | effects of varying loading rates on the brazilian splitting characteristics of coal rock composites |
| topic | coal-rock composites brazilian splitting strength characteristics energy features crack evolution |
| url | http://xuebao.hpu.edu.cn/info/11196/95998.htm |
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