TY - JOUR
T1 - Shaft failure characteristics and the control effects of backfill body compression ratio at ultra-contiguous coal seams mining
AU - Yan, Hao
AU - Zhang, Jixiong
AU - Zhou, Nan
AU - Zhang, Sheng
AU - Dong, Xiangjian
PY - 2018/6/1
Y1 - 2018/6/1
N2 - Solid backfill coal mining is a mainstream method in green coal mining, which has gradually become a key technology to control shaft deformation when recovering industrial square pillars during mining of ultra-contiguous coal seams. On the basis of the engineering background of Nantun Coal Mine, this paper combined physical simulation, numerical simulation, and theoretical analysis for studying shaft deformation, failure characteristics, and stress variation rules during the mining of ultra-contiguous coal seams. The results revealed that shaft deformation and failure were the results of the movement of strata caused by coal mining; in addition, the backfill body compression ratios in two adjacent coal seams were the key factors in shaft deformation control during the mining of ultra-contiguous coal seams. Moreover, the effects of the backfill body compression ratios on shaft deformation in ultra-contiguous coal seam mining were simulated by ABAQUS, and the optimal compression ratios of backfill body in two coal seams were determined. Finally, based on the probability-integral method, the vertical compressive deformation and the inclined deformation of shaft were estimated and the results showed that the shaft safety and stability at ultra-contiguous coal seam mining can be provided when the backfill body compression ratios of 3upper and 3lower coal seams were set at 85%.
AB - Solid backfill coal mining is a mainstream method in green coal mining, which has gradually become a key technology to control shaft deformation when recovering industrial square pillars during mining of ultra-contiguous coal seams. On the basis of the engineering background of Nantun Coal Mine, this paper combined physical simulation, numerical simulation, and theoretical analysis for studying shaft deformation, failure characteristics, and stress variation rules during the mining of ultra-contiguous coal seams. The results revealed that shaft deformation and failure were the results of the movement of strata caused by coal mining; in addition, the backfill body compression ratios in two adjacent coal seams were the key factors in shaft deformation control during the mining of ultra-contiguous coal seams. Moreover, the effects of the backfill body compression ratios on shaft deformation in ultra-contiguous coal seam mining were simulated by ABAQUS, and the optimal compression ratios of backfill body in two coal seams were determined. Finally, based on the probability-integral method, the vertical compressive deformation and the inclined deformation of shaft were estimated and the results showed that the shaft safety and stability at ultra-contiguous coal seam mining can be provided when the backfill body compression ratios of 3upper and 3lower coal seams were set at 85%.
KW - Backfill body compression ratio
KW - Mining-induced failure
KW - Shaft deformation
KW - Ultra-contiguous coal seam
UR - http://www.scopus.com/inward/record.url?scp=85049521858&partnerID=8YFLogxK
U2 - 10.1007/s12665-018-7641-x
DO - 10.1007/s12665-018-7641-x
M3 - Article
AN - SCOPUS:85049521858
SN - 1866-6280
VL - 77
JO - Environmental Earth Sciences
JF - Environmental Earth Sciences
IS - 12
M1 - 458
ER -