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Decreasing coal bump risk through optimal cut sequencing with a non-linear boundary element program.

Authors
Zipf-RK Jr.; Heasley-KA
Source
Rock Mechanics: Contributions and Challenges: Proceedings of the 31st U.S. Symposium, June 18-20, 1990, Colorado School of Mines, Golden, Colorado. Hustrulid WA, Johnson GA, ed., Brookfield, VT: A.A. Balkema, 1990 Jan; :947-954
Link
NIOSHTIC No.
10008625
Abstract
In room-and-pillar coal mining, violent coal bumps can occur during the retreat mining phase when stress levels in pillars adjacent to the gob area reach their maximum. Proper mining sequences can decrease the risk of bumps. This U.S. Bureau of Mines paper describes a nonlinear boundary element program, MULSIM/NL, used to evaluate cut sequences for retreat mining that decrease the coal bump risk. Program MULSIM/NL features six material types (linear and nonlinear) and an energy subroutine to obtain energy release rate (ERR) values for a mining sequence. The ERR gauges the coal bump risk and the relative desirability of different mining sequences. ERR studies with MULSIM/NL suggest the Olga Mine method's superiority for retreat mining in bump-prone conditions over other methods, such as single-split and fender, pocket and wing, or open ending.
Keywords
Mining-industry; Coal-mining; Underground-mining; Room-and-pillar-mining; Retreat-mining; Rock-bursts; Rock-mechanics; Structural-analysis; Coal-processing; Mathematical-models; Analytical-processes; Ground-control; Ground-stability; Environmental-control; Environmental-engineering; Environmental-stress
Publication Date
19900101
Document Type
OP; Conference/Symposia Proceedings
Editors
Hustrulid-WA; Johnson-GA
Fiscal Year
1990
NTIS Accession No.
NTIS Price
ISBN No.
9789061911234
Identifying No.
OP-55-91
NIOSH Division
PRC
Source Name
Rock Mechanics: Contributions and Challenges: Proceedings of the 31st U.S. Symposium, June 18-20, 1990, Colorado School of Mines, Golden, Colorado
State
PA; CO
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