跨度对顶板稳定性影响的研究与控制

摘要

针对晋华宫矿11＃层8703工作面皮带机头硐室跨度大、支护难的问题，采用理论分析和数值模拟等方法，研究了巷道跨度对顶板稳定性的影响，得到了巷道顶板挠度分布的函数式和顶板位移与跨度的关系式，发现最大挠度与巷道跨度的四次方成正比，硐室顶板最大位移为拓宽前2703巷的5．89倍。根据减跨理论和悬吊理论，设计了锚杆、锚索的支护参数，解决了大跨度巷道支护难的根本问题。工业性试验表明，硐室开挖支护稳定后，硐室两帮收敛量为32．0mm，顶板下沉23．7mm，底鼓18．4mm，支护效果良好。%Accordingtotheproblemofbeltheadchamberwithlargespananddifficultsupportof8703faceinNo. 11layerofJinhuagongcoalmine,bytheoreticalanalysisandnumericalsimulationmethod,studiedtheeffectofthe roadwayspanonroofstability,getthefunctionformulaofroadwayroofdeflectiondistributionandrelationshipbetween theroofdisplacementandspan,findthatthemaximumdeflectionisproportionaltoroadwayspantothefourthpower, thechamberroof'smaximumdisplacementis5.89timesof2703roadwaybeforebroadened.Accordingtothereduction theoryandsuspensiontheory,designsupportparametersofboltandanchor,solvetheessentialissueswhichleadtodif-ficultytotheheadchamberwithlargespan.Industrialtestshowedthatafterroadwaybroadenedreachsteadystate,the convergencebetweentwosidesis32.0mm,roofsinkingis23.7mmandfloorheaveis18.4mm,thesupporteffects aregood.