坚硬顶板沿空留巷充填体加固技术研究

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中图分类号：TD353 文献标志码：A 文章编号：1005-8249（2025）03-0101-06

DO1：10.19860/j.cnki.issn1005- 8249.2025.03.019

Abstract：Aimingattheproblemsofbulgeand instabilityofilingbodyingobsideentryretaining withhardrof，taking15209 workingfaceoflingzidacoalmineastheengeeringbackground，thestabilityanddeformationcharacteristicsoffllngbodyin gobsideentryretainingwereanalyzedbyusingnumericalsimulationandtheoreticalcalculationmethodoffilingbody reinforcementmechanicalmodel，andthecompositereinforcementstructureof"frameandprestresedsplitbolt"offllingbody under theconditionof blastingand prespliting hardroof was proposed.Theresearch resultsshowthat：underthe influenceof rotatingdynamicloadofhardroof，crackspenetratingtheinclineddirectionofthefilingbodyappearinthefilingbody，and thereare twofailureformsofshearand tension.Obvious bulgeappearsatthetopof goafsideandthebotomofretainedroadway side，andtheintegrityisdamaged，whichisveryprone to instability；Thereinforcementcomponentappliesprestressnboth sidesof theflingbody，andthelateralconstraintchangesfromthefreesurfacestatetothestressconstraintsurfacestate.Its stiffess and strength are improved，and the range of shear and tensile failure plastic zone isreduced by 76% and 43%respectively.Thereisnobulgeontheoutsideandtheinterallargecrack issignificantlyreduced，whichcanmakefulluseof thestabilityoftefilingbodyandreducethesldingandrelativedisplacementofthefillingbody.Inengineeringpractice，the lateral and longitudinal deformation of the filling body are 170mm and 200mm respectively，maintaining high post peak strength and good bearing effect，which can provide reference for related projects.

Key Words： blasting presplitting；hard roof；backfill body；bearing reinforcement

0 引言

沿空留巷巷旁支护体的稳定性是沿空留巷成功的关键，通常采用高水材料、高水灰渣材料及膏体等充填材料进行巷旁充填，以形成具有足够强度的充填体[1-2] 。（剩余6812字）