Research on the characteristics of overlying strata movement in downward and upward mining longwall panel in steeply inclined seam by similar physical simulation
Jingyi Cheng 1, 2, Yidong Zhang 3, Peng Zhang 4
COMPUTER MODELLING & NEW TECHNOLOGIES 2014 18(12A) 446-452
1 School of Mines, Key Laboratory of Deep Coal Resource Mining, Ministry of Education of China, China University of Mining and Technology, Xuzhou, Jiangsu, 221116, China
2 Department of Mining Engineering, West Virginia University, Morgantown, WV, 26506, USA
3 State Key Laboratory of Coal Resources and Safe Mining, China University of Mining and Technology, Xuzhou, Jiangsu, 221116, China
4 Carlson Software, Watertown, MA 02472, USA
To study the failure and collapse rule of overlying strata movement in the downward and upward mining longwall panel in a steeply inclined seam, panel B in mine A was used as the engineering background. Experimental methods for similar physical simulations were applied to study the overlying strata movement in different mining stages. Experimental results showed that during the upward and downward mining stages, the main breaking span for the crack development rule inside the overlying rock was significantly different. During the downward mining stage, the internal vertical fissures tended to close, whereas crack development of the vertical fissures was exacerbated in the upward mining stage. In addition, the main breakage span in the upward mining stage was obviously less than that in the downward mining stage. Field measurement results validated the experimental results, which were significant to the retreating panel under similar conditions.