双层水泥稳定碎石基层层间压实度差异对基层整体性能的影响被引量：5

Impact of different degrees of compactness of cement stabilized macadam base on the performance of base

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摘要【目的】研究双层水泥稳定碎石基层上下层压实度差异对基层性能的影响。【方法】首先对层间不同水灰比及水泥浆剂量的试件进行直接剪切试验和直接拉伸试验,得到最佳水泥浆剂量及水灰比;在此基础上,研究了上下层层间压实度差异对水泥稳定碎石基层整体无侧限抗压强度、抗弯拉强度及疲劳寿命的影响;最后,利用有限元软件ABAQUS模拟分析了不同上下层压实度差下路表弯沉和各结构层层底弯拉应力。【结果】通过试验得到水泥稳定碎石基层层间最佳水泥浆剂量和水灰比分别为0.311 g/cm^(2)和1∶1.5,提高基层整体压实度并降低基层上下层压实度差能够提高水泥稳定碎石基层的整体力学强度和疲劳性能,进而降低路表弯沉和提高基层疲劳寿命。【结论】减小水泥稳定碎石基层上下层压实度差能够显著提高基层的力学强度及耐久性。 [Purposes]This work aims to study the influence of the compaction difference between the upper and lower layers of double⁃layer cement stabilized macadam base on the performance of the base.[Methods]Firstly,the specimens with different water to cement ratio and cement slurry dosage between layers were subjected to direct shear test and tensile test to obtain the optimum water to cement ratio and cement content.On this basis,the effects of the compaction difference between layers on the unconfined compressive strength,flexural tensile strength and fatigue life of double⁃layer water stabilized macadam were studied.Finally,ABAQUS was used to simulate the road surface deflection of the actual pavement with different compactness of the upper and lower layers,and the bending tensile stress at the bottom of each structure layer.[Findings]The optimum cement slurry dosage and water to cement ratio between water stabilized macadam layers were 0.311 g/cm^(2) and 1∶1.5,respectively.Improving the overall compactness of the base and reducing the compactness difference between the upper and lower layers of the base couldimprove the overall mechanical strength and fatigue performance of the cement stabilized macadam base,reduce the road surface deflection and improve the fatigue life of the base.[Conclusions]Reducing the compaction difference between the upper and lower layers of water stabilized macadam base couldsignificantly improve the strength and durability of the base.

作者田小革胡宏立李光耀郭常辉卢雪蓉 TIAN Xiaoge;HU Hongli;LI Guangyao;GUO Changhui;LU Xuerong(School of Traffic and Transportation Engineering,Changsha University of Science&Technology,Changsha 410114,China)

机构地区长沙理工大学交通运输工程学院

出处《长沙理工大学学报（自然科学版）》 CAS 2023年第3期69-78,共10页 Journal of Changsha University of Science and Technology:Natural Science

基金国家自然科学基金资助项目(51978086) 湖南省交通运输厅科技项目(201905)。

关键词道路工程压实度力学性能有限元水泥稳定碎石基层 road engineering compactness mechanical properties finite element method cement stabilized macadam base

分类号 U414 [交通运输工程—道路与铁道工程]

作者简介通信作者:田小革(1970—)(ORCID:0000⁃0001⁃9699⁃7041),男,教授,主要从事道路工程材料方面的研究。E⁃mail:tianxiaoge@126.com。