| Autor: |
ZHENG Youlei, HE Hu, ZHANG Xiong, JIA Xiaodong, YANG Yang |
| Jazyk: |
čínština |
| Rok vydání: |
2020 |
| Předmět: |
|
| Zdroj: |
Meikuang Anquan, Vol 51, Iss 6, Pp 81-86 (2020) |
| Druh dokumentu: |
article |
| ISSN: |
1003-496X |
| DOI: |
10.13347/j.cnki.mkaq.2020.06.016 |
| Popis: |
In order to promote the controllable safety and efficiency of the hard roof in coal mines, this paper studies the multi-layer directional high pressure fracturing technology. The UDEC numerical simulation was used to study the kinetic and total energy release of the roof before and after directional hydraulic fracturing. The results show that the weighting interval is reduced by 7.7% and 17% respectively after the hard roof is inclined and layered fracturing. The maximum kinetic energy release is reduced by 47.8% and 50%; the system total energy release is reduced by 28% and 41%, which reduces the risk of rock burst caused by hard roof. By improving the liquid supply process, the depth limitation of the technology is realized, and the efficiency and safety of the technology are greatly expanded. The maximum hole depth is 20 m and the cracking radius is more than 10 m. The results of drill cutting and micro-seismic monitoring results show that the amount of cuttings in the fractured roof area is significantly lower than that before the fracturing, and both are lower than the critical value. The frequency and energy of seismicity during the hydraulic fracturing period are reduced, especially the large energy seismic signal, which indicates a significant reduction in rock bust risk and also demonstrates the effectiveness of this technology in the controlling of hard thick roof in coal mines. |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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