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Study On Overlying Strata Movement Behavior For Longwall Filling Mining Of Superhigh-water Material And Its Control

Posted on:2013-02-15Degree:DoctorType:Dissertation
Country:ChinaCandidate:C D SunFull Text:PDF
GTID:1111330362966258Subject:Mining engineering
Abstract/Summary:PDF Full Text Request
Implementation of the longwall coalface overall filling is the difficulty spot andresearch hot spot of the filling mining technology development. This paper is based on theNo.6longwall filling coalface geological conditions of Taoyi coalmine using super-highwater filling material, by the combination of theoretical analysis, laboratory simulationtest and the industrial test methods, combined with industrial test achievements of theNo.6longwall filling coalface, making a systematic research for super-high waterlongwall filling mining strata movement regularity and surface subsidence control, andeffectively directing engineering practice, the main research results are as follows:(1) Firstly making the systematic test for the different stages of mechanical propertiesof longwall coalface filling mining various forms (pure slurry, cementation-mixed,interface-mixed) super-high water mined-out area filling cementation body, applying the10000kN large size filling material test system, and making the large size creep test, thispaper analyzes the super-high water creep property and size effect, providing thefoundation parameters for the filling practice.(2) Establishing the longwall filling mining overburden strata structure mechanicsmodel of "overburden strata-roof-coal seam-filling body-floor", combined with fillingbody physical mechanical properties, and reveals the longwall mining roof breaking rulesmechanism, and analyzing the pressure characteristics, based on "support-the surroundingrock" interaction relationship, putting forward the corresponding support resistancecalculation methods, providing the theoretical guidance for the longwall coalface fillingmining.(3) Applying the numerical calculation and combined with equivalence principle ofmining height, making the systematic analysis for overburden strata movement rules andground surface deformation characteristics under the condition of the longwall coalfacedifferent equivalent mining height, and providing guidance for filling method choice andprocess design.(4) According to the super-high water material filling mining characteristics, incomparison with filling process of the system, in order to adapt to the need of the moremassive longwall filling, and on the basis of underground filling process system, buildingthe ground filling process system (320m3/h) to support the longwall filling mining,developing the slurry production automatic control system, making the automation in theproduction monitoring, production ratio set, data query, the system calibration, improvingthe production efficiency of the slurry system, and providing important support for filling efficiency improvement and timely filling capacity.(5) Making the research and applying the filling process technology to adapt tosuper-high water material longwall filling mining, through constructing artificial isolationplugging wall to lift filling liquid surface height, effectively control the roof breaking andcaving height development, forming the super-high water material longwall filling miningoverburden strata control technology system. The longwall filling mining coalfaceobservation results of mine pressure appearance and ground surface deformation show thatthis method can effectively control the deformation of the ground surface.
Keywords/Search Tags:super-high water materials, longwall filling mining, overburden strata control, filling process, filling rate
PDF Full Text Request
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