The Mechanism and Application of Deep-Hole Precracking Blasting on Rockburst Prevention
| Autor: | Zhenhua Ouyang, Qingxin Qi, Shankun Zhao, Baoyang Wu, Ningbo Zhang |
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| Jazyk: | angličtina |
| Rok vydání: | 2015 |
| Předmět: | |
| Zdroj: | Shock and Vibration, Vol 2015 (2015) |
| Druh dokumentu: | article |
| ISSN: | 1070-9622 1875-9203 |
| DOI: | 10.1155/2015/625691 |
| Popis: | The mechanism of preventing rockburst through deep-hole precracking blasting was studied based on experimental test, numerical simulation, and field testing. The study results indicate that the deep-hole precracking could change the bursting proneness and stress state of coal-rock mass, thereby preventing the occurrence of rockburst. The bursting proneness of the whole composite structure could be weakened by the deep-hole precracking blasting. The change of stress state in the process of precracking blasting is achieved in two ways: (1) artificially break the roof apart, thus weakening the continuity of the roof strata, effectively inducing the roof caving while reducing its impact strength; and (2) the dynamic shattering and air pressure generated by the blasting can structurally change the properties of the coal-rock mass by mitigating the high stress generation and high elastic energy accumulation, thus breaking the conditions of energy transfer and rock burst occurrence. |
| Databáze: | Directory of Open Access Journals |
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