Recent insight into longwall strata movements deduced from subsidence analysis

Conference · Wed Jan 01 04:00:00 EST 1986

OSTI ID:5865262

Heasley, K A; Saperstein, L W

In this paper, a number of novel hypothesis that provide a fresh perspective on the characterization of strata movements associated with longwall mining are developed by analyzing subsidence measurements with an influence-function-based computer program. With this influence-function technique, easily obtained surface displacements can be used to determine some of the complicated, expensive, and difficult to measure movements of the immediate roof strata in a longwall panel. The primary hypothesis developed by this analysis proposes the existence of an area of partial roof caving near the edge of a panel called the ''edge effect.'' A second hypothesis, interrelated with the first, promotes the importance of the effect of gate-entry closure on the observed strata movements. Finally, in the conclusions of this paper, the importance of accurately understanding these longwall strata movements for proper subsidence prediction or gate design is stressed.

• OSTI ID: 5865262
• Report Number(s): CONF-8609178-
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
012031* -- Coal
Lignite
& Peat-- Underground Mining-- Strata Mechanics & Control-- (1987-)
99 GENERAL AND MISCELLANEOUS
990220 -- Computers
Computerized Models
& Computer Programs-- (1987-1989)
COMPUTER CALCULATIONS
COMPUTER CODES
FORECASTING
GROUND MOTION
GROUND SUBSIDENCE
LONGWALL MINING
MEASURING METHODS
MECHANICAL STRUCTURES
MECHANICS
MINING
MOTION
ROCK MECHANICS
ROOFS
STRATA CONTROL
STRATA MOVEMENT
SUPPORTS
UNDERGROUND MINING