加載速率對(duì)ACC結(jié)構(gòu)抗剪性能的影響

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中圖分類號(hào)：0383 國(guó)標(biāo)學(xué)科代碼：13035 文獻(xiàn)標(biāo)志碼：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

隨著我國(guó)礦產(chǎn)資源需求的持續(xù)增長(zhǎng)和各類巖土工程規(guī)模的擴(kuò)大，礦床開(kāi)采深度顯著上升，導(dǎo)致煤礦巷道所處的地質(zhì)環(huán)境變得日益復(fù)雜[1-2]。（剩余13315字）