Protecting method for long-wall strip type coordinated skip-mining under earth and rockfill dams

Abstract

The invention discloses a protecting method for long-wall strip type coordinated skip-mining under earth and rockfill dams. With the adoption of the method, in combination with geological and mining conditions of mining areas and positions of the earth and rockfill dams, mining work surface positions, mining widths and mining sequences are reasonably determined, the earth and rockfill dams are subjected to smaller tensile deformation, cracks are avoided, safe usage of earth and rockfill dam bodies and safe and normal conduction of mining are guaranteed, that is, on the basis that the safety of the earth and rockfill dam bodies is guaranteed, safe mining under the earth and rockfill dam bodies is realized, 'three unders' pressed coal is liberated to the maximum extent, the coal resource mining rate is increased, service lives of mines are prolonged, experience in coal mining under the earth and rockfill dam bodies can be enriched and accumulated, references can be provided for coal mining under similar conditions, and huge economic benefit and social benefit can be obtained.

Description

technical field [0001] The invention belongs to the technical field of coal mining methods, and in particular relates to a strip-type coordinated jump mining protection method for the lower longwall of an earth-rock dam. Background technique [0002] "Three Downs" coal mining. Currently, coal mining under water bodies includes under the sea, under rivers, under lakes, under reservoirs and under aquifers. Coal mining under reservoir dams belongs to the research field of "Three Downs" coal mining. Underwater coal mining in foreign countries has a history of 100 years. Countries such as Japan, the United Kingdom, Australia, Germany, Canada, Chile, the United States and the former Soviet Union have accumulated rich experience in coal mining under seas, rivers, lakes and aquifers. [0003] my country started the research and practice of coal mining under water since the 1950s, and has achieved many successful experiences and research results, such as oceans, rivers, lakes, reserv...

AI Technical Summary

Problems solved by technology

[0008] At present, there are many studies on coal mining under buildings (structures) using coordinated mining and strip mining at home and abroad, but the longwall strip-type coordinated mining technology that combines coordinated mining and strip mining is used under earth-rock dams. , so that the dam body can withstand small tensile deformation, avoid cracks, and ensure the safe use of the dam body. There has not been similar literature reports at home and abroad.

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