Research On Key Technology And Engineering Application Of Backfilling Mining With 2.0?2.5m Mining Height In Tangshan Mine

Backfilling support is one of the core equipment of comprehensive mechanized coal mining technology,which creates space for the filling face.Based on the problem of coal pressure in the 5 coal seams of air shaft coal pillar area in Tangshan Mine,the design and improvement of the key technology of 2.0?2.5 m mining height filling mining are put forward in this paper.The engineering application is carried out,and the mining effect is summarized by analyzing the law of surface deformation and the stoping situation.Based on the theoretical calculation,field measurement and numerical simulation,the paper summarizes and analyzes the mining experience of the past filling face and the new demand of 2.0?2.5 m mining height filling mining in Tangshan Mine,and puts forward the optimization strategy of filling mining.The surface deformation law of 2.0?2.5 m mining height filling working face is studied,the mining scheme of this filling working face is optimized and the key equipment is selected and reformed Finally,the characteristics of ground pressure,the law of ground surface deformation and the analysis of economic benefit are analyzed.The main results achieved are as follows:(1)The filling mining technology of about 3.5 m height and its improvement direction were analyzed from geological conditions,mining processes,equipment conditions.According to the special requirements of 2.0?2.5 m working face,the mining scheme and equipment requirements suitable for new working face conditions are designed.(2)Under the premise of comprehensive analysis of the optimization strategy of work surface,the surface sink is a reference index,and the analysis of the surface deformation regulation is studied by studying the order of the working surface restriation order,the working surface arrangement direction and the length of the working surface.Comparing the optimal working surface restriation order is jumping,the work surface is inclined,the working surface length is 75 m,forming a set of2.0?2.5m high-filled working surface system arrangement scheme.(3)According to the optimal plan,the work surface arrangement,production system and calculation production capacity are discussed in detail,and production processes including coal processes,filling processes and railway alley are designed.A full-filled and full-filled surface arrangement is used;and measures to improve the coalloading efficiency and control equipment is proposed for the context of jet filling.(4)The design method of filling support instead of hydraulic support in caving coal is formed.The skeleton model and solid model of the bracket were established using Creo,and the operation characteristics of the stent were analyzed.The design satisfies usage requirements in terms of intensity and operation characteristics using ABAQUS.After designing and optimizing a single device,it is supported.(5)The engineering application of backfill mining technology with mining height of 2.0 ? 2.5 m is summarized and analyzed.Analysis of the surface sinking of the work surface,the sinking coefficient is 0.74,the surface building is small,and it can be used normally,and the filling effectively controls the surface movement deformation.Summarize the economic benefits including manufacturing cost,operating costs,compensation costs,business tax and so on.There are 52 figures,37tables and 90 references in this thesis.