NIOSHTIC-2 Publications Search

Shield Mechanics and Resultant Load Vector Studies.

Authors
Barczak-TM; Garson-RC
Source
MISSING :43 pages
Link
NIOSHTIC No.
10005241
Abstract
The term "resultant load vector" is defined as the representation of the forces applied to a longwall roof support element by strata activity through a single, quantifiable measure of support resistance. The relatively complex kinematics of the shield structure prohibit determination of support resistance simply from the summation of leg forces. In the research reported in this Bureau of Mines study, the mechanics of the shield structure were evaluated, and a technique was developed whereby the resultant shield loading could be determined by instrumenting supports with pressure transducers and strain gauges to measure leg, canopy capsule, and lemniscate link forces. This technique has been laboratory tested in the Bureau's mine roof simulator. Functional relationships among variables were assessed, and confidence intervals were established for prediction of the resultant load vector parameters. Resultant load measurements were taken on five instrumented shields on an active longwall face in Colorado. Results were analyzed and found to be consistent with shield mechanics and anticipated roof behavior. Benefits to be derived from this research, future efforts, and long-range goals are discussed.
Publication Date
19860101
Document Type
IH; Report of Investigations
Fiscal Year
1986
Identifying No.
RI 9027
NIOSH Division
PRC;
Source Name
MISSING
State
CO;
Page last reviewed: April 12, 2019
Content source: National Institute for Occupational Safety and Health Education and Information Division