Technology News 452 - LAYOUT: a bump hazard assessment.
Pittsburgh, PA: U.S. Department of the Interior, Bureau of Mines, TN 452, 1995 Sep; :1-2
The goal of this U.S. Bureau of Mines (USBM) research was to facilitate safe and efficient room-and-pillar retreat mining of bump-prone coalbeds by limiting coalbed stress adjacent to expanding gob areas through variation of section layouts. The first step was design of total-extraction pillars and their associated pillar-extraction plans. The second step was development of a coalbed strength model. The third step was development of stress limit design criteria. The fourth and final step was development of a methodology to estimate the magnitude and distribution of development and abutment loads applied to the pillar line.
Mining-industry; Underground-mining; Ground-control; Ground-stability; Room-and-pillar-mining; Coal-mining
Pittsburgh, PA: U.S. Department of the Interior, Bureau of Mines, TN 452