振动作用下填石路基压实特性的数值模拟  

Numerical Simulation on Compacting Features of Rock-fill Subgrade under the Action of Vibration

作　　者：丁智勇[1] 李国政 张通化 马登成[1] DING Zhiyong;LI Guozheng;ZHANG Tonghua;MA Dengcheng(Key Laboratory of Road Construction & Equipment of Ministry of Education, Chang'an University, Xi'an 710064, China;Dongfeng Cummins Engine Co., Ltd., Xiangyang 441000, Hubei, China)

机构地区：[1]长安大学道路施工技术与装备教育部重点实验室,西安710064 [2]东风康明斯发动机有限公司,湖北襄阳441000

出　　处：《路基工程》2019年第6期114-118,共5页Subgrade Engineering

基　　金：陕西省自然科学基金面上资助项目(2017JM5077);陕西省交通运输科研资助项目(17-03K)

摘　　要：为了揭示路基内部应力载荷的分布状况,分析碎石填料形状对路基压实的影响,运用离散元软件EDEM对填料粒径在10~160 mm的填石路基振动压实过程进行建模。模拟结果表明:路基的最大接触应力和最大瞬时速度随振幅增大而增大,孔隙率减小,填料形状对孔隙率有影响;路基密实的过程是颗粒力链结构不断建立和打破的动态过程;颗粒密实中,大颗粒带动小颗粒运动,从应力大的区域向应力小的区域迁移运动,大颗粒受力大,是外载荷的主要抗力;颗粒形状越复杂,碾压过程中密实度波动越大。In order to reveal the distribution of stress loading inside subgrade and to analyze the influence of the shape of gravel fills on the subgrade compaction, the vibration compaction process of rockfill subgrade with the particle size between 10 and 160 mm in diameter was modeled by use of discrete element software EDEM. The result of modeling shows that, the maximum contact stress and the maximum instantaneous velocity of the subgrade increase with the increase of amplitude;when the porosity decreases, the particle shape may have impact;the process of subgrade compaction is a dynamic course in which the force chain structure of particle is continuously established and broken;in the compaction of particles, those large ones drive the small ones to move from the area of large stress to that of small stress, wherein the larges particles are subject to large force and are the main resistance against external loads;the more complex shape the particles have, the greater fluctuation of compactness is in rolling.

关 键 词：道路工程 填石路基 压实特性 EDEM 颗粒形状 孔隙率 

分 类 号：U416.1[交通运输工程—道路与铁道工程]