The Mechanics of Coal Mine Bumps and the Interaction Between Coal Pillars, Mine Roof, and Floor.
NTIS: PB/222-898 Available for Reference At Bureau Libraries :88 pages
This report describes research on the mechanics of coal mine bumps done over a 26-month period. The general term "coal mine bump" refers to the sudden and violent failure of in situ coal. The objective of this research was to develop computational procedures for predicting coal mine bumps in particular mining situations. Such procedures would prove beneficial for planning extraction sequences--and perhaps even mining methods--in bump-prone coal deposits. Although no single set of circumstances is solely responsible for causing coal mine bumps, it is generally agreed that at least one of five conditions is necessary in order for them to occur: (1) the depth of cover exceeds 500 feet, (2) the overlying strata are relatively strong and stiff, (3) the coal is structurally strong, (4) the floor does not heave readily, and (5) the mining method produces high stresses over a large area of the seam. Except for the last, these conditions are related to geological factors that are difficult to control.
CP; Final Contract Report;
NTIS Accession No.
NTIS: PB/222-898; Available for Reference At Bureau Libraries
University of Minnesota