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Study In Failure And Deformation Character Of Entry Along Goaf And The Technology Of Strata Control About The Fully Mechanized Sublevel Caving In Deep Mine

Posted on:2007-10-14Degree:MasterType:Thesis
Country:ChinaCandidate:L S ZhouFull Text:PDF
GTID:2121360185492631Subject:Mining engineering
Abstract/Summary:PDF Full Text Request
The paper firstly analyzed the damage mechanism in entry along the goaf with fully mechanized sublevel caving mining by which field actual measure the character of deforming and damage. It simulated mechanized sublevel caving mining with the soft of FLAC3D in different coal pillar size,different extracting speed and different support way.This is the conclusion.(1)The best way to protect entry of fully mechanized sublevel caving mining is layout narrow pillar.(2)It improved the environment of the entry by accelerated extracting speed when the speed is slowly.But enclosing rock deforming valuation is gradually reducing when the extract speed was reach some extent.The difficulty degree of entry service is the slowest speed to extract when extract speed is sometime fast or sometime slow. It is favorable to entry service keep stable speed.(3)It can effectively maintain stability to entry of along goaf that adopted full-length anchoring bolt to supporting because it variated enclosing rock and improved enclosing rock bearing condition,raise the confining pressure,increasing enclosing rock mechanics property parameter if reinforced the thicker coal seam area by anchor rope.The paper also analyzed the reason of rock burst is generated in entry along goaf aim at the damage of rock burst in entry along goaf in fully mechanized sublevel caving mining and it simulated the effect on pressure relief in entry. This is the conclusion.(1)It can effectively transfer stress concentrated area far away to entry and reducing the hazard degree of generating rock burst by pressure relief by blasting and drilling.(2)The stress is the most concentrated at the corner of coal seam and the easiest generated rock burst. It is importance examined the effect on pressure relief in that area after pressure relief.
Keywords/Search Tags:fully mechanized sublevel caving, the entry Along goaf, numerical simulation, supporting by bolting, rock burst
PDF Full Text Request
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