加载速率对ACC结构抗剪性能的影响
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中图分类号：0383 国标学科代码：13035 文献标志码：A
Effect of loading rate on the shear performance of ACC structures
SHANRenliang1，XIAO Shengchao1，SONG Wei'，BAI Haobo1， LI Yongzhen1， ZHAO Xinpeng'， TONG Xiao² （1.SchoolofechanicsndCivilEngneering，ChinaUniversityofiningandTechnologyBeijing），BeijingChina; 2.SchoolofEarthScienceand Engineering，Hebei UniversityofEngineering，HandanO56o38，Hebei，China）
Abstract：Theshear mechanical propertiesanddeformationdamage mechanismof thedouble structural planesof traditional anchor cables and new anchor cables with C-shaped tube structures （abbreviated as ACC）under different loadingrate conditions were investigated through experimentaland numerical simulation analyses.Dual structural face shear tests were conducted at shear displacement loading rates of 2，10，20，30，and 40mm/min under 55 MPa concrete specimen strength and 200kN preload，with shear deformationcurves，peak structural shear loads，steel wire damage patterns，and structural plane shearstrengthcontributionsasthemain parametersconsidered.Theresultsshowthattheloadingratesignificantlyaffects the shear performanceofthestructure.Withinacertain loadingrate interval，influenced bythedamageaccumulationrateand the strainrate strengthening effect，thestructureexhibitscharacteristicsofstrength weakeningandstrengthening，respectively， withalarge variation interval in shear load-carrying capacity.Near the structural plane，thesupport structure showsa combinationof tensile and shear damage.However，the ACC structure，due to the presence of the C-shaped tube，exhibits lowe stressconcentration effects，reducedfuctuation inthe testcurve，andsignificantly weakened interal steel wire damage comparedto traditional anchorcables.Meanwhile，the numerical modelof the double shear test of the ACC structure， constructedbasedonthetestresults，exhibitshighacuracy.Numericalsimulationsofdynamicloadingtestsdemonstratethat theanchoringsystemformedbytheACCstructurehasagoodenergyabsorptionefect，whichbecomesmorepronouncedwith increasingimpactenergy.Underhigh-speedimpact，theACCstructureissignificantlyafectedbythestrainratereinforcement effect，with higher shear load capacity at greater impact velocities.
Keywords：double structural surface shear test;anchor cable with C-shaped tube structures;deformation damage characteristics; impact load
随着我国矿产资源需求的持续增长和各类岩土工程规模的扩大，矿床开采深度显著上升，导致煤矿巷道所处的地质环境变得日益复杂[1-2]。（剩余13315字）