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砖混骨料再生道路水泥稳定基层的路用性能与有限元模拟研究
作者：余红明1，孟涛1，刘港归1，章旭东2，姚惠明2
（1.浙江大学 建筑工程学院，浙江 杭州 310058；2.杭州钱江新城市政园林建设有限公司，浙江 杭州 310016）
摘要：将建筑拆除垃圾破碎筛分成再生砖混骨料，制成水泥稳定基层并铺设试验段测试其路用性能；进一步利用有限元软件Abaqus建立三维道路结构模型，计算分析在车辆荷载作用下对再生基层与天然基层道路各结构层力学响应的影响。结果表明，与天然骨料基层相比，砖混再生基层的含水率较大、干密度较低，无侧限抗压强度及抗压回弹模量较低，导致道路回弹弯沉值增大，但具有更好的压实度和平整度；有限元模拟表明，2种基层道路各结构层在标准车辆荷载作用下力学响应相似，路面竖向最大位移与试验段检测弯沉值相符，砖混再生基层会增大路面竖向位移，却能降低面层及基层底部的拉应力。
关键词：再生砖混骨料；水泥稳定基层；路用性能；有限元模拟
中图分类号：TU528.041 文献标识码：A 文章编号：1001-702X（2020）11-0107-05
Research on road performance and finite element simulation of cement stabilized recycled mixed aggregate base
YU Hongming1，MENG Tao1，LIU Ganggui1，ZHANG Xudong2，YAO Huiming2
（1.College of Civil Engineering and Architecture，Zhejiang University，Hangzhou 310058，China；
2.Hangzhou Qianjiang New City Municipal Garden Construction Co. Ltd.，Hangzhou 310016，China）
Abstract：In this paper, the building demolition waste was crushed and screened into recycled mixed aggregate, which was made into a cement-stabilized base and the road performance of test section were tested. Further, the finite element software Abaqus was used to establish a three-dimensional road structure model, to analyze the effects of vehicle loading on the mechanical response of each road structural layer of recycled base and natural base road. Results showed that, compared with the natural aggregate road base, the recycled aggregate road base has a higher moisture content, lower dry density, lower unconfined compressive strength and lower compressive rebound modulus, resulting in a higher deflection value, also it has better compaction and flatness. Finite element simulations showed that the mechanical response of each structural layer of the two types of base roads under standard vehicle loads is similar. The maximum vertical displacement of the road surface and the detected deflection value in the test section matched, the recycled mixed aggregate road base will increase the vertical displacement of the pavement, but can reduce the tensile stress of the bottom of surface and base.
Key words：recycled mixed aggregate，cement stabilized base，road performance，finite element simulation