铁路碎石路基碾压效果的数值模拟  

Numerical Simulation of Roller Compaction of Coarse Granular Soil

作　　者：徐京海 徐宇冉 张远博 XU Jinghai;XU Yuran;ZHANG Yuanbo(China Railway Shanghai Group Co.,Ltd.,Shanghai 200071,China;Department of Civil Engineering,Shanghai Jiao Tong University,Shanghai 200240,China)

机构地区：[1]中国铁路上海局集团有限公司,上海200071 [2]上海交通大学土木工程系,上海200240

出　　处：《铁道学报》2023年第5期113-118,共6页Journal of the China Railway Society

基　　金：国家自然科学基金(41630633)。

摘　　要：离散元法广泛应用于碎石路基压实、破碎过程的模拟分析。拟通过对碎石路基压实过程进行离散单元仿真模拟分析,建立碎石路基沉降量与碾压遍数的拟合关系,分析碎石路基摊铺厚度、碾压速度、材料刚度参数、材料强度系数等对碎石路基沉降量的影响,来揭示颗粒碾压破碎过程和破碎规律。研究结果表明,碎石路基摊铺厚度越大,碾压速度越快,碎石材料刚度系数越大,达到稳定状态所需碾压遍数越多;材料刚度系数及强度系数决定稳定状态下的沉降量。为研究碎石路基压实破碎研究提供新方法,是对碎石路基现场碾压试验研究的补充。Discrete element method is widely used in the simulation analysis of the compaction and crushing process of gravel roadbed.In this paper,through the discrete element simulation analysis of gravel subgrade compaction process,the process and law of particle crushing were revealed.The fitting relationship between the settlement of the gravel roadbed and the number of rolling was established to analyze the influence of the paving thickness of the gravel roadbed,the rolling speed,the material stiffness parameters,and the material strength coefficient on the settlement of the gravel roadbed.The research results show that the greater the paving thickness of crushed stone subgrade,the faster the rolling speed,the greater the stiffness coefficient of crushed stone material,and the more rolling times needed to achieve the stable state.The material stiffness coefficient and strength coefficient determine the settlement under the stable state.The discrete element numerical simulation method of the crushed stone subgrade compaction process provides a new method for the study of crushed stone subgrade compaction and crushing.It is a supplement to the field rolling test research of crushed stone subgrade.

关 键 词：铁路路基 压实过程 数值计算 孔隙率 沉降量 离散元法 

分 类 号：TU74[建筑科学—建筑技术科学]