TY - JOUR
TI - Engineering design of selecting particle size of gangue under solid backfill mining for protecting water resources
AU - Zhang Yun
AU - Shan Peng-Fei
AU - Bai Rui
AU - Dai Jing-Jing
JN - Thermal Science
PY - 2020
VL - 24
IS - 6
SP - 4019
EP - 4026
PT - Article
AB - In view of the ecological environment damages caused by the loss of water  resources and the gangue accumulation during coal mining, this paper  proposed a solid backfill mining method to recover the coal seam under the  water body, which could fundamentally reduce the sinking space of the  overlying strata, and better prevent water-flowing fractures expanding.  Consequently, according to the deformation characteristics of the overlying  strata of the solid backfill mining, a mechanical model was established for  superimposed beams on elastic foundation with simu­lating the expansion  water-flowing fractures under solid backfill mining. A method of calculating  the height of the water-flowing fractured zone was provided, and the  mechanical mechanism of the development of water-flowing fractures in the  overlying strata under solid backfill mining was expressed. Meanwhile, the  backfill rate of the experimental working face was designed as 80% to avoid  the ecological environment damages caused by gangue accumulation. The  stress-strain characteristics of gangue samples under different grading  size schemes were further studied.