Stiffness characteristics of longwall shields

Book · Fri Jan 01 00:00:00 EST 1988

OSTI ID:7018571

Barczak, T M; Schwemmer, D E

Since longwall strata activity is characterized by roof-to-floor and face-to-waste displacements, a model with two degrees of freedom was used to describe the load-displacement relationship of the shield structure. The model considers the support as an elastic body and relates horizontal and vertical resultant forces acting on the support to associated displacements as a function of the stiffness of the support structure. Stiffness coefficients under full canopy and base contact configurations were determined by controlled displacement loading of longwall shields in the Bureau's Mine Roof Simulator. These two-legged longwall shields of different manufacture were investigated. The stiffness characteristics of these shields were evaluated relative to two parameters, namely, shield height and setting pressure. The tests results indicate a reduction in shield stiffness for increasing height. Setting pressure was found to have less of an effect on shield stiffness, producing only a slight increase in stiffness as setting pressure increased. Similar trends were observed for all three shields, indicating a similarity in stiffness characteristics for shields of the same basic configuration.

• OSTI ID: 7018571
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
99 GENERAL AND MISCELLANEOUS//MATHEMATICS, COMPUTING, AND INFORMATION SCIENCE
LONGWALL MINING
SHIELD SUPPORTS
PARAMETRIC ANALYSIS
CONFIGURATION
ELASTICITY
MATHEMATICAL MODELS
PERFORMANCE TESTING
SIMULATION
US BUREAU OF MINES
MECHANICAL PROPERTIES
MECHANICAL STRUCTURES
MINING
NATIONAL ORGANIZATIONS
POWERED SUPPORTS
SUPPORTS
TENSILE PROPERTIES
TESTING
UNDERGROUND MINING
US DOI
US ORGANIZATIONS
012031* - Coal
Lignite
& Peat- Underground Mining- Strata Mechanics & Control- (1987-)
990230 - Mathematics & Mathematical Models- (1987-1989)