| Autor: |
Zhiheng Cheng, Zhenhua Ouyang, Quanle Zou, Yun Lu, Xidong Zhao, Meichen Li |
| Jazyk: |
angličtina |
| Rok vydání: |
2020 |
| Předmět: |
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| Zdroj: |
Energy Science & Engineering, Vol 8, Iss 5, Pp 1620-1633 (2020) |
| Druh dokumentu: |
article |
| ISSN: |
2050-0505 |
| DOI: |
10.1002/ese3.620 |
| Popis: |
Abstract The revelation of the distribution characteristics of stress and fractures in the floor strata is of great significance to improve the regional gas drainage efficiency and to eliminate or reduce the risk of coal and gas outburst in adjacent coal seams during multi‐seam mining. In this paper, the stress distribution in the floor under mining condition was derived, and the characteristics of stress zones in the floor were elaborated while mining the 22201 working face in Shaqu coal mine in Shanxi province, China. Besides, the propagation laws of fractures in different stress zones were theoretically analyzed, and the distribution law of fracture angles in the floor strata under different mining‐induced stresses was obtained. The research results demonstrate that the compression and transition zones show high vertical stress and less developed fractures and are dominated by fractures with a large angle (>60°), which is unfavorable for gas drainage. The expansion zone in the floor within 2‐40 m in the rear of the working face is characterized by high unloading degree of vertical stress and developed fractures. Moreover, fractures with a small angle ( |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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