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Research of Complete Core-drilling Technology of Coal Seam and Influence Factors on It
- Source :
- Gong-kuang zidonghua, Vol 37, Iss 1, Pp 35-37 (2011)
- Publication Year :
- 2011
- Publisher :
- Editorial Department of Industry and Mine Automation, 2011.
-
Abstract
- In order to solve the problem that coal seam can be drilled only upward but not downward in process of uncovering coal of crossheading and shaft, a core-drilling device of dual-core and single-switch was used to do core-drilling test in shafts of some mine in Shanxi province and crossheading tunnel of Licun Coal Mine of Lu'an Group. Main influencing factor of failing in down core-drilling was summarized, which was residual water in borehole. Some measures were adopted to drain the residual water, including grouting, pumping water and deslagging with pressure air in whole core-drilling process, so as to realize complete core-drilling of coal seam. It was pointed out that the sign of successful core-drilling is that a lot of dry coal dust bursts forth form drilling hole in drilling process of core-drilling device in coal seam.
Details
- Language :
- Chinese
- ISSN :
- 1671251X
- Volume :
- 37
- Issue :
- 1
- Database :
- Directory of Open Access Journals
- Journal :
- Gong-kuang zidonghua
- Publication Type :
- Academic Journal
- Accession number :
- edsdoj.2484a5e42b49473ebbc48c107e4fd3aa
- Document Type :
- article