基于离散元的废旧二灰碎石与土混合料承载比细观力学特性研究  

Meso-Mechanical Properties of Bearing Ratio of Waste Lime‑Fly Ash Macadam and Soil Mixture Based on Discrete Element

作　　者：张小飞 陈芋如 张松 高雷 田盎然 唐强[2] ZHANG Xiaofei;CHEN Yuru;ZHANG Song;GAO Lei;TIAN Angran;TANG Qiang(Kunshan Transportation Development Holding Group Co.,Ltd.,Suzhou,Jiangsu 215335,China;Soochow University,Suzhou,Jiangsu 215131,China)

机构地区：[1]昆山交通发展控股集团有限公司,江苏苏州215335 [2]苏州大学,江苏苏州215131

出　　处：《中外公路》2024年第3期63-69,共7页Journal of China & Foreign Highway

基　　金：国家自然科学基金资助项目(编号:52078317);江苏省自然科学基金优秀青年基金资助项目(编号:BK20210720);江苏省地质矿产勘查局科技项目(编号:2021KY06);苏州市建设系统科研项目(编号:2021-25,2021ZD30);昆山交通发展控股集团有限公司科技项目;中交隧道工程局有限公司科技项目(编号:8gs-2021-04);中交一公局有限公司科技项目(编号:KJYF-2021-B-19);中铁四局科研开发计划项目(编号:2021-19)。

摘　　要：建筑垃圾应用于路基过程中,其材料承载力对道路服役性能具有重要影响。为评价建筑垃圾用于路基填料时的细观力学特性,该文利用离散元软件对不同含石率的废旧二灰碎石与土混合料进行承载比试验,并利用离散元法揭示强度形成机理。结果表明:混合料的承载比随含石率增大不断增加,含石率为80%时达到最大值。在离散元模拟承载比试验中,空隙率随着二灰碎石土的含石量的增大先降低后增大,当含石率为80%时混合料的空隙率最小,此时能达到最佳的承载效果。随着含石率的逐渐增大,废旧二灰碎石之间的颗粒相互嵌挤,形成骨架结构,因此能够有效承担来自贯入杆的荷载。In the process of applying construction waste to subgrade,the bearing capacity of the material has an important impact on the service performance of roads.In order to evaluate the meso-mechanical properties of construction waste used as subgrade filler,the bearing ratio test of waste lime-fly ash macadam and soil mixture with different stone contents was carried out by using discrete element software.The strength formation mechanism was revealed by using the discrete element method.The results show that the bearing ratio of the mixture increases with the increase in the stone content and reaches the maximum value when the stone content is 80%.In the bearing ratio test by discrete element simulation,the porosity first decreases and then increases with the increase in the stone content of lime-fly ash macadam soil.When the stone content is 80%,the porosity of the mixture is the smallest,and the best bearing effect can be achieved.As the stone content rises,the particles between the waste lime-fly ash macadam are embedded with each other to form a skeleton structure so that it can effectively bear the load from the penetration rod.

关 键 词：路基工程 二灰碎石 加州承载比 空隙率 颗粒流离散元 

分 类 号：U414[交通运输工程—道路与铁道工程]