A New Method to Assess Thick, Hard Roof-Induced Rock Burst Risk Based on Mining Speed Effect on Key Energy Strata
| Autor: | Wenlong Li, Shihao Tu, Hongsheng Tu, Xun Liu, Kaijun Miao, Hongbin Zhao, Jieyang Ma, Long Tang, Yan Li |
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| Jazyk: | angličtina |
| Rok vydání: | 2022 |
| Předmět: |
Renewable Energy
Sustainability and the Environment Geography Planning and Development thick hard roof roof-type rock burst key energy strata principle mining speed effect evolution of energy accumulation/release evaluation method of rock burst risk Building and Construction Management Monitoring Policy and Law |
| Zdroj: | Sustainability; Volume 14; Issue 22; Pages: 15054 |
| ISSN: | 2071-1050 |
| DOI: | 10.3390/su142215054 |
| Popis: | Roof-type rock burst (RTRB) frequently occurs in the hard, thick roof of working faces, which causes roadway failure, facility damage and even personnel casualties. Previous research results show that mining speed has obvious effects on the rock burst risk and many rock burst accidents are caused by an unreasonable mining speed. To provide a theoretical foundation for the determination of a reasonable mining speed in a specific working face subjected to RTRB, in this study, the key energy strata (KES) principle contraposing the RTRB was proposed, and the criterion of KES was determined by defining the energy release coefficient kc. On this basis, the energy accumulation characteristics of coal and energy release of surrounding rock were analyzed using FLAC3D numerical simulation. Accordingly, to assess the rock burst risk considering the mining speed effect, a new method was proposed and a new energy index Φvi was defined to divide rock burst risk with different mining speeds into four grades. To validate the availability of the KES principle and the new assessment method, they were adopted in a thick, hard roof working face. The application results indicate that the mining speed of 3.6 m/d obtained by the method meets the demands of safe and high-efficiency production. |
| Databáze: | OpenAIRE |
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