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- Title
Study on the breaking span and the influence on gas migration in goaf.
- Authors
BINWEI XIA; SHIJIE GUO; YIYU LU; XIAOLONG LI; PENG YU; JINLONG JIA
- Abstract
To solve the abnormal gas emission of goaf during the thick coal seam overlying hard roof to pressure on the Tashan coal Mine in Datong, focusing on the hard roof of some working surface in Datong mining, and based the key stratum theory, Vlasov thick plate theory and thin plate theory, this paper gets the breaking span of hard rock strata which are quite different in thickness in a near distance, and explains the stratum caving with different weighting. We established the dynamic, migration model of gas in the mined out area under the impact of collapse according to the characteristics of overlying strata, with the aid of COMSOL multi-physical field coupling software, to analyze the gas emission law in the goaf under the overlying stratum. The result shows that the breaking span of the upper roof is twice longer than the lower one, leading to strong and weak weighting. When the layered roof rock caving, the most of mining goaf gas will be poured into the working face upper corner and the high extracted way. Especially in the upper roof caving, the upper corner gas concentration increases obviously. So the goaf and the upper corner gas should be the focus of governance.
- Subjects
GAS migration; MINE filling; COAL mining; CAVING techniques; COMPUTER software
- Publication
Journal of Mines, Metals & Fuels, 2016, Vol 64, Issue 12, p659
- ISSN
0022-2755
- Publication type
Article