Journal of Environmental Biology

The migration law of overlay rock and coal in deeply inclined coal seam with fully mechanized top coal caving

Jian Liu¹, Shan-le Chen^1,2, Hua-jun Wang², Yu-cheng Li¹ and Xiaowei Geng¹

¹College of Safety Science and Engineering, LiaoNing Technical University, Liao Ning FuXin-123 000,China

²College of Mining Engineering, Guizhou University of Engineering Science, Gui Zhou BiJie-551 700,China

^*Corresponding Author?s Email : lelechen131452@163.com

Publication Data

Paper received:

09 June 2014

Revised received:

30 September 2014

Re-revised received:

01 January 2015

Accepted:

07 February 2015

Abstract

In a mine area, some environment geotechnics problems always occure, induced by mined-out region such as the subsidence and cracks at ground level, deformation and destruction of buildings, landslides destruction of water resources and the ecological environment. In order to research the migration of surrounding rock and coal in steeply inclined super high seams which used fully mechanized top coal caving, a working face of a certain mine was made as an example, analyzed the migration law of the overlay rock and coal under different caving ratio of fully mechanized top coal caving with numerical simulation analysis. The results suggest that the laws of overlay rock deformation caused by deeply inclined coal seam were different from horizontal coal seam. On the inclined direction, with an increase of dip angle and caving ratio, the vertical displacement of overlay rock and coal became greater, the asymmetric phenomenon of vertical displacement became obvious. On the trend direction, active region and transition region in goaf became smaller along with the increase of mining and caving ratio. On the contrary, the stable region area became greater. Therefore, there was an essential difference between the mechanism of surface movement deformation with deeply inclined coal seam and that with horizontal coal seam.     

 Key words

Fully mechanized top coal caving, Migration law, Mining and caving ratio, Numerical simulation

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