Mechanics of coal mine bumps and the interaction between coal pillars mine roof and floor. Research report, 1971--1972
Mechanics of coal mine bumps and the interaction between coal pillars mine roof and floor. Research report, 1971--1972 The report describes research done on the mechanics of coal mine bumps over a 26-month period at the University of Minnesota. The general term 'coal mine bump' refers to the sudden and violent failure of in situ coal. The objective of the research was to develop computational procedures for predicting coal mine bumps in particular mining situations. Such procedures presumably 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 exceed 500 ft., (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 relate to geological factors that are difficult to control. Control measures concern mining techniques. (GRA)
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