动荷载下硅砂的破碎特性及吸能效应试验研究

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中图分类号：O383；TU318 国标学科代码：13035 文献标志码：A

Experimental study on crushing characteristics and energy absorption effect of silica sand under dynamic loading

CUI Peng1，LUO Gang²，LIU Le³， CAO Xinxin4，LI Bangxiang1，MEI Xuefeng§ （1.School ofArchitectural Engineering，Shandong UniversityofTechnology，Zibo255049，handong，China;2.FacultyofeosciencesndEnvironmentalEngneering，SouthwestJotongUnivesityChengdu6176，ichuanChina;3.School of Civil Engineering， Chongqing Jiaotong University， Chongqing 40oo74， China;4.DepartmentofHighwayandArchitecture，andongrasportVocationalCollege，Weang26，andongChin;5.College of Civil Engineering，Inner Mongolia University of Science and Technology， Baotou O14010， Inner Mongolia， China）

Abstract：This study investigates theresponse characteristics ofsilicasand under dynamic loading，employing a modified split Hopkinson pressure bar （SHPB）togain insightsinto itscrushingbehaviorandenergyabsorption properties.Fourdistinct grain size （2.5-5.0mm ， 1.25-2.50mm ， 0.60-1.25mm ，and <0.3mm ） were analyzed，with results demonstrating that the dynamic stres-strain behaviorofsilicasandisafectedbyboth grainsizeandstrainrate.Thedeformationprocessofsilica sandiscategorzedintofourstages：elastic，yielding，plasticandunloading.Plasticcompactionisdominantduringtheyielding stage，whereascrushingcompactionprevailsintheplasticstage.Therelativebreakageofparticlesshowsapositivecoelation withbothstrainrateandeffective particlesize，andaninvesecorelationwithfractaldimension.Teimpactofparticle sizeon energyabsorptioneficiencyisinfluenced byfactorssuchasmineralcomposition，particlesize，anddifferentiationdeee. Under identical stresslevelslarger particle sizes demonstrategreater energyabsorptioneficiency;similarlyunderidentical loading strainrates，larger particles exhibitlowerpeak stressToimprovesand'senergyabsorptioneficiencyandreduce required loading levels， sand with larger particle sizes is recommended.

Keywords： silica sand; split Hopkinson pressre bar; fractal crushing characteristics; energy absorption effect

砂是一种具有多孔、松散和高压缩性特点的颗粒状材料，在爆炸、冲击和振动荷载作用下，会发生显著的变形和破碎效应[2]，对应力波有极强的弥散和衰减特性，被广泛应用于军事防护分配层[3]和抗落石冲击棚洞（挡墙）缓冲层4等方面。（剩余20125字）