橡胶混凝土路面板抗冲击性能研究  

Research on Impact Resistance of Rubber Concrete Pavement Slab

作　　者：薛刚 牟一飞 董亚杰 XUE Gang;MOU Yi-fei;DONG Ya-jie(School of Civil Engineering,Inner Mongolia University of Science and Technology,Baotou 014000,China)

机构地区：[1]内蒙古科技大学土木工程学院,包头市014000

出　　处：《公路》2024年第5期76-83,共8页Highway

基　　金：国家自然科学基金项目,项目编号52168032。

摘　　要：为研究橡胶混凝土路面的抗冲击能力,设计了3种截面型式的橡胶混凝土路面试件,基于自由落锤冲击试验和有限元模拟,研究路面试件的破损形态、冲击能量、冲击加速度、最大冲击力及冲击位移。结果表明,采用橡胶混凝土为冲击接触面的试件CRC-U破坏时,上表面仅有一条水平裂缝,同时有凹坑产生;以普通混凝土作为冲击接触面的试件CRC-D破坏时,上表面产生交错裂缝。试件CRC、CRC-U、CRC-D的冲击能量分别是试件NC的1.095倍、2.671倍和1.191倍。普通混凝土路面试件NC在前期冲击加载中加速度峰值呈现递增的趋势,且球体质量越大加速度峰值递增越明显,含橡胶混凝土的试件CRC、CRC-U、CRC-D在相同冲击荷载下,加速度峰值呈现不同程度的递减。含橡胶混凝土的试件能量吸收率均大于普通混凝土,试件CRC-U的能量吸收率最高。赋予试件冲击能量270 J,冲击力大小排序为CRCCRC-U>CRC-D>NC,可见橡胶集料不同程度改善了路面试件的抗冲击性能。试件CRC-D的最终破坏形态较轻,冲击作用下的塑性应变较小;试件CRC-U的抗冲击次数最高、能量吸收率最高,抗冲击性能最佳。In order to study the impact resistance of rubber concrete pavement,three cross-section types of rubber concrete pavement specimens are designed.Based on the free drop hammer impact test and finite element simulation,the damage morphology,impact energy,impact acceleration,maximum impact force and impact displacement of pavement specimens are studied.The results show that when CRC-U specimen with rubber concrete as impact contact surface is damaged,there is only one horizontal crack on the upper surface,and there are pits.When CRC-D failure of specimens with ordinary concrete as impact contact surface,the upper surface generates staggered cracks.The impact energy of CRC,CRC-U and CRCD is 1.095,2.671and 1.191times that of NC,respectively.The peak acceleration of normal concrete pavement specimen NC shows an increasing trend in the early impact loading,and the greater the mass of the ball,the more obvious the peak acceleration increases.The peak acceleration of CRC,CRC-U and CRCD specimens containing rubber concrete decreases in varying degrees under the same impact load.The energy absorption rate of specimens containing rubber concrete is higher than that of ordinary concrete,and the energy absorption rate of CRC-U is the highest.The impact energy of the specimen is 270J,and the impact force is sorted as CRCCRC-U>CRC-D>NC.It can be seen that rubber aggregates improve the impact resistance of road surface specimens to different degrees.The final failure mode of CRC-D is light,and the plastic strain under impact is small.The specimen CRC-U has the highest impact resistance,the highest energy absorption rate and the best impact resistance.

关 键 词：路面板 抗冲击性能 橡胶混凝土 有限元模拟 自由落锤 

分 类 号：U416.216[交通运输工程—道路与铁道工程] U414.1