摘要
基于二维颗粒流软件PFC2D构建了沥青混合料单轴贯入数值试验方法;研究了试件尺寸、加载速率、计算时步值等条件对单轴贯入数值试验结果的影响;确定了数值试验的标准条件,评价了单轴贯入数值试验方法的可靠性;分析了单轴贯入试验的细观机制。结果表明:试件尺寸为Φ101. 6 mm×h63. 5 mm、加载速率为1 mm·min-1、计算时步为1×10-3s·step-1时,数值试验可取得稳定结果;贯入强度实测曲线与模拟曲线基本吻合,单轴贯入数值试验误差在4%以内;随着荷载贯入,应变也随之增大,细观接触力越来越密集且作用力越来越大,并逐渐向试件底部扩展;随着贯入量的增加,试件两侧接触力逐渐密集,但无显著的集中现象;接触力网络的纵向变化亦明显于横向变化。
Uniaxial penetration simulation test method of asphalt mixture was constructed on the basis of two-dimensional particle flow code software PFC 2D.The influence of the specimen size,loading rate,calculation step value and other conditions on the results of uniaxial penetration simulation test method was researched,the numerical test standard conditions was determined,the reliability of the uniaxial penetration numerical experiment method was evaluated,and the micro-mechanism of the uniaxial penetration test was analyzed.The results show that numerical can obtain the stable result when the size of specimen is Φ 101.6 mm× h 63.5 mm,the loading rate is 1 mm·min^-1 and the calculation step is 1×10^-3 s·step^-1.The simulation curves of penetration strength are basically consistent with the measured curves,uniaxial penetration numerical test error is within 4%.With the increase of loads,the strain increases,micro contact force is more and more intensive and the force is growing,and gradually extended to the specimen bottom;With the increase of the penetration value,the contact force of both sides of specimen gradually intensive,but no significant concentration phenomenon;Longitudinal changes is more significant than lateral changes in the contact force network.
作者
蒋应军
易勇
方剑
韩占闯
纪小平
林宏伟
JIANG Ying-jun;YI Yong;FANG Jian;HAN Zhan-chuang;JI Xiao-ping;LIN Hong-wei(School of Highway Engineering Chang'an University,Xi'an 710064,China;Jinhua Traffic Engineering Quality Supervision Station,Jinhua 321000,China)
出处
《科学技术与工程》
北大核心
2019年第13期267-274,共8页
Science Technology and Engineering
基金
国家自然科学基金(51408044)资助
关键词
道路工程
沥青混合料
数值试验
颗粒流
细观机制
road engineering
asphalt mixture
simulation test
particle flow
micro mechanis
