Stability analysis and treatment of multi-stage left goaf group in Linglong mining area

Toeffectivelycontroltheundergroundgoafandrealizetheconstructiongoalofnotailings, thestabilityanalysisandtreatmentofthemulti-stageleftgoafgroupinLinglongminingareawerecarriedout.Firstly,thestabilityoftheroofwasanalyzedbyusingthefixedbeamtheory,thesimplysupportedbeamtheoryandtheloadtransferintersectionlinetheory,andthestabilityofthepillarwasanalyzed according to the area bearing theory and pillar strength formula.Then,the distribution of the stressanddisplacementofsurroundingrockingoafwerestudiedbyusingFLAC3Dsoftware.Finally,accordingtothetheoreticalanalysisandnumericalsimulationresults,theremainingspacegroupswere
dividedintothreegradesofstability,relativelystabilityandinstability,andthewholetailingscementationfillingtestwascarriedoutingoafG16,veinNo.47,veinNo.50andveinNo.47-1abandoned roadway.TheresultofresearchshowsthatgoafG9,G17andG26areinstablestate,whileseventeen goafssuchasG1,G2andG3areinarelativelystablestate.SixgoafssuchasG6,G7andG10arein aninstablestate.Theresultsofcementedfillingtestshowthatthebackfillhasgoodconsolidationeffect, andrealizetheundergroundsafedisposaloftailingsinmineralprocessing. Itisusefultocandesign reasonablemanagementplanaccordingtotheanalysisresultofgoafstability.