Technology And Application Of Safe And Efficient Mining In Fully Mechanized Caving Face Of Thick Coal Seam

China's thick coal reserves are huge,accounting for nearly 50% of the country's reserves,so how to improve the recovery rate of thick coal mining has become an important topic.There are a large number of thick and extra-thick coal seams in the Inner Mongolia autonomous region and Shanxi Province of China.According to the different geological mining conditions of these thick coal seams,each enterprise takes measures according to local conditions and relies on different mining technologies to play a crucial role in the extraction of thick coal seam resources and energy reserve.A certain mine mainly adopts the layered mining technology for the coal resources of thick coal seam,which has obvious disadvantages,such as high mining cost,many operation links,excessive labor intensity of workers,etc.Meanwhile,the layered mining work is not adaptable to geological structure and the production capacity is greatly limited.In order to improve the economic benefit of the mine and take the safety and efficiency of the working face as the target,the feasibility of fully mechanized topcoal caving mining technology is explored and studied.Based on this,this paper,taking the mine thick coal seam working face coal take put sex and roof and floor conditions as the research object,adopting physical test,the methods of similar material model simulation analysis,the mining technical conditions of adaptability,mechanics parameters,the caving mining working face of coal caving take put and the mechanism of explorative study is made on safe and efficient mining method,the paper the main work and research results are as follows:(1)Based on the mining technology conditions of a certain mine,the applicability of fully mechanized caving mining technology in this mine area mainly focuses on improving the caving property of top coal and controlling the caving ratio and spontaneous combustion.5 # coal seam in the mining area through laboratory test,the uniaxial compressive strength and modulus of elasticity mechanics parameters,such as testing,and the data analysis,it is concluded that with the increase of moisture content of coal samples,coal samples contained hydrophilic substances from coal sample for internal damage,make its mechanical strength is generally lower,plastic increase in conclusion,for mine based data for the follow-up work.(2)Based on the roof condition and the characteristics of coal seam,the similar material model is established,the overlying strata activity,the displacement law of top coal and the relationship between the top coal caving property and the supporting pressure on the fully mechanized top coal caving face are expounded,and the methods to improve the top coal caving property on the working face are summarized.(3)Adopt the method of theoretical analysis and calculation of the fullymechanized mining area test surface parameters estimation,particle flow code(PFC)numerical simulation combined with PFC,identified by interval,and ratio,coal main way of coal face mining coal parameter,and based on the above data,choose the model is suitable for the working face equipment,mainly including selection of MG300/730-WD1 type double-drum shearer,ZFS6800 / type hydraulic support and SGZ 18/35 ? 1000/1200 type scraper conveyor,etc.(4)Taking the production system and the working face management system as the object,this paper analyzes the supporting capacity of fully mechanized caving mining,compares and analyzes the direct production cost between layered mining and fully mechanized caving mining,and summarizes the economic advantages of fully mechanized caving mining.This paper has 38 pictures,14 tables and 73 references.