Analysis and Application on Controlling Thick Hard Roof Caving with Deep-Hole Position Presplitting Blasting
For the thick hard roof (THR) in Datong mining area, mining operations often led to large-scale hanging-roof and frequent and strong strata behavior, threatening mining safety seriously. Based on the instability mechanism, the fracture model for THR was established, including rock blocks articulatio...
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| Format: | Article |
| Language: | English |
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Wiley
2018-01-01
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| Series: | Advances in Civil Engineering |
| Online Access: | http://dx.doi.org/10.1155/2018/9763137 |
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| author | Baobao Chen Changyou Liu |
| author_facet | Baobao Chen Changyou Liu |
| author_sort | Baobao Chen |
| collection | DOAJ |
| description | For the thick hard roof (THR) in Datong mining area, mining operations often led to large-scale hanging-roof and frequent and strong strata behavior, threatening mining safety seriously. Based on the instability mechanism, the fracture model for THR was established, including rock blocks articulation and combined cantilever beam, and the limit initial and periodic intervals of THR were determined to be 36.0 m and 8.0 m, respectively. The study proposed the deep-hole presplitting blasting (DPB) for weakening THR for mitigating strong strata behaviors. Blasting-induced fracture characteristics were calculated, determining the charging coefficient and holes spacing. LS-DYNA was employed for establishing a DPB model to analyze crack evolution under the synergistic action of blasting stress wave and detonation gas and the attenuation characteristics for rock peak particle velocity, verifying the rationality of blasting parameters. Field measurement analysis indicated that the immediate roof induced a timely collapse to fill the goaf and the THR was effectively cut off near the presplitting line. Meanwhile, the working resistance was utilized with safety allowance. The field application showed the DPB on controlled THR caving achieved the significant effect. |
| format | Article |
| id | doaj-art-c991c5d6de2443b584c7a8d111af27ae |
| institution | Kabale University |
| issn | 1687-8086 1687-8094 |
| language | English |
| publishDate | 2018-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Advances in Civil Engineering |
| spelling | doaj-art-c991c5d6de2443b584c7a8d111af27ae2025-02-03T01:32:52ZengWileyAdvances in Civil Engineering1687-80861687-80942018-01-01201810.1155/2018/97631379763137Analysis and Application on Controlling Thick Hard Roof Caving with Deep-Hole Position Presplitting BlastingBaobao Chen0Changyou Liu1Key Laboratory of Deep Coal Resource Mining, School of Mines, Ministry of Education of China, China University of Mining and Technology, Xuzhou 221116, ChinaKey Laboratory of Deep Coal Resource Mining, School of Mines, Ministry of Education of China, China University of Mining and Technology, Xuzhou 221116, ChinaFor the thick hard roof (THR) in Datong mining area, mining operations often led to large-scale hanging-roof and frequent and strong strata behavior, threatening mining safety seriously. Based on the instability mechanism, the fracture model for THR was established, including rock blocks articulation and combined cantilever beam, and the limit initial and periodic intervals of THR were determined to be 36.0 m and 8.0 m, respectively. The study proposed the deep-hole presplitting blasting (DPB) for weakening THR for mitigating strong strata behaviors. Blasting-induced fracture characteristics were calculated, determining the charging coefficient and holes spacing. LS-DYNA was employed for establishing a DPB model to analyze crack evolution under the synergistic action of blasting stress wave and detonation gas and the attenuation characteristics for rock peak particle velocity, verifying the rationality of blasting parameters. Field measurement analysis indicated that the immediate roof induced a timely collapse to fill the goaf and the THR was effectively cut off near the presplitting line. Meanwhile, the working resistance was utilized with safety allowance. The field application showed the DPB on controlled THR caving achieved the significant effect.http://dx.doi.org/10.1155/2018/9763137 |
| spellingShingle | Baobao Chen Changyou Liu Analysis and Application on Controlling Thick Hard Roof Caving with Deep-Hole Position Presplitting Blasting Advances in Civil Engineering |
| title | Analysis and Application on Controlling Thick Hard Roof Caving with Deep-Hole Position Presplitting Blasting |
| title_full | Analysis and Application on Controlling Thick Hard Roof Caving with Deep-Hole Position Presplitting Blasting |
| title_fullStr | Analysis and Application on Controlling Thick Hard Roof Caving with Deep-Hole Position Presplitting Blasting |
| title_full_unstemmed | Analysis and Application on Controlling Thick Hard Roof Caving with Deep-Hole Position Presplitting Blasting |
| title_short | Analysis and Application on Controlling Thick Hard Roof Caving with Deep-Hole Position Presplitting Blasting |
| title_sort | analysis and application on controlling thick hard roof caving with deep hole position presplitting blasting |
| url | http://dx.doi.org/10.1155/2018/9763137 |
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