矿业科学技术学报（英文版）
礦業科學技術學報（英文版）
광업과학기술학보（영문판）
Lnternational Journal of Mining Science and Technology
2015年
6期
884-895
,共12页
Thick coal seam%Single lift depil aring of total thickness (SLDTT)%Extraction height%Pil ar instability%Caving of coal
This paper reviews underground mining methods for total thickness of a thick coal seam in single lift (TTTCSSL). Review shows the required engineering for extraction of thick seams needs to be fitted with thickness of the seam, behavior of rock-mass and surrounding stress conditions for efficient mining. Variants of TTTCSSL are able to extract a maximum 10–12 m thickness only. An improvement in bending moment of the overlying coal band in longwall top coal caving (LTCC) provides better under-winning opportunity for the roof coal band. An acceptable limit of 25 MPa compressive strength of coal for the success of LTCC may be increased under favorable geo-technical conditions. Bord and pillar in India adopted induced caving of roof coal band for single lift depillaring of total thickness (SLDTT) of a compe-tent thick coal seam developed along floor. Case studies are given to arrest the adverse effects of extrac-tion height on pillars.
