Ground Control Theory And Application Of Backfilling Collaborate With Caving Fully-mechanized Mining

During the mining process in the deep area,the mining working face is facing a series of gangue treatment engineering problems,such as a large amount of gangue from the protection layer,auxiliary transportation difficulties,gangue discharge space shortage and environmental pollution.The conventional whole section solid backfilling mining technology has been applied in the large-scale popularization due to the technical advantage in the rock movement control,gangue consumption and environment protection This article propose a collaborative technology of backfilling mining technique and caving technique based on solid backfilling mining technique and the traditional caving technique.It is designed to make full use of advantages of gangue consumption from fully mechanized solid backfilling mining and high-yield production from traditional fully mechanized caving method,which realizes the safe and highly effective green mining of coal resources in ecological fragile mining area.Also this enriches and expands the solid filling mining technique and application scope.Based on the technology principle and characteristics of collaborative mining,the laboratory test,physical simulation,numerical simulation,mechanics analysis and engineering practice are adopted to carry the research.Focused on the unique structure characteristics of the goaf by using the collaborative mining,this paper analyzed how the backfill ratio,and backfill section and caving section ratio influence the strata behavior in backfill section,caving section and transition section,which reveals the mining pressure control of collaborative mining,and the main innovative results are as follows:(1)Based on gangue filling materials compaction property,adopted the physical simulation method to study the different compressed ratio and filling and caving length ratio in surface mining strata movement and fracture development pattern,analyzes the collaborative mining face three kinds of asymmetry strata spatial structure,reveals the collaborative mining strata tended to masonry structure and its formation mechanism,through the theoretical calculation coordinated mining transition radius area about 6 m.(2)Design the filling body dynamic update parameter simulation method,the numerical simulation method analyzes the fulling and caving length ratio and filling collapse than the main controlling factors on the synergy of fully mechanized face filling period,caving and the transition area between strata deformation and stress distribution of surrounding rock effect characteristics,reveals the basic rules of mining pressure appeared together.(3)Established a collaborative mining overburden rock basic roof elastic foundation plate mechanical model,design model based on Galerkin analytical method is used to solve the process;Basic roof strata deflection equation was deduced,and reveals the coordinated mining basic roof failure mechanism and the characteristics of local "C-X" breaking.(4)Raised collaborative mining technology and design the methods and procedures of collaborative mining technology,and successfully conducted industrial test,has obtained the good effect of engineering application.