Numerical modeling analysis of stress transfer modification concepts for deep longwall mines.
Denver, CO: U.S. Department of the Interior, Bureau of Mines, RI 9579, 1995 Jan; :1-43
This U.S. Bureau of Mines (USBM) report evaluates three stress-transfer-modification concepts for their potential in reducing longwall gate road stresses and closures. In each of the three concepts--packwalling, gob infilling, and entry filling--support structures are constructed on the headgate side of the panel parallel with or inby the face line. When the headgate becomes the tailgate of the adjacent panel, these structures are in place to accept stresses transferred from the mined-out panel. Using the USBM nonlinear boundary-element program MULSIM/NL, baseline models of typical longwall stress transfer behavior were developed for both intermediate depth and deep mining conditions. These models were verified by comparing model results with field measurements and observations. The stress-transfer-modification concepts were then incorporated into the deep baseline model to quantify the effects of each concept on tailgate closure.
Stress-strain-relations; Stress-intensity-factors; Strata-control; Columns-Supports; Loads-Forces; Mechanical-properties; Underground-mining; Mathematical-models; Model-studies; Mining-engineering; Longwall-mining; Coal-mines; Stress-analysis; Displacement; Numerical-modeling; Gate-roads; Fill-materials; Ground-control
Report of Investigations
NTIS Accession No.
Denver, CO: U.S. Department of the Interior, Bureau of Mines, RI 9579