Development of principles of opening strength during underground mining
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There have been analyzed fundament a land applied research work saimed at development, testing and manufacturing application of efficient technological plans for developing, supporting and maintaining underground workings. There has been found the evolution of scientific and production principles which underlie the technologies of supporting and maintaining underground workings. The analyzed ones have been evaluated. There have been found trends of principle development ranging from counteraction and counterbalance to contribution, removal and transfer of the high pressure energy concentrated aroundworkings.