CRTSⅠ型CA砂浆动态压缩试验及本构关系研究

发布时间：2018-01-04 17:20

本文关键词：CRTSⅠ型CA砂浆动态压缩试验及本构关系研究　出处：《铁道工程学报》2014年05期 　论文类型：期刊论文

【摘要】：研究目的:水泥乳化沥青砂浆(CA砂浆)层充填在CRTSⅠ型板式无砟轨道的轨道板和底座板之间,起着支承、传载、调整、减振隔振等功能,因此需要全面研究CA砂浆的力学性能。本文以现场取样CA砂浆圆柱体试件为对象,考虑10-5s-1~10-2s-1四种不同应变率,在位移和应变率双重控制下,测试动力加载条件下单轴受压应力-应变全曲线;研究抗压强度、峰值应变、弹性模量等力学参数的应变率效应以及本构方程。研究结论:(1)应变率对CA砂浆的力学性能影响显著;(2)CA砂浆的抗压强度、弹性模量和峰值应变均随应变率的增加而增大,其中抗压强度应变率敏感性最强,在10-5s-1~10-2s-1应变率范围内,强度可提高2.5倍左右;(3)CA砂浆在不同应变率下的应力-应变曲线形状相似,不同应变率下CA砂浆的应力-应变关系可以用本文提出的有理分式表达;(4)通过与试验数据对比发现,本文提出的不同应变率下CA砂浆的本构方程与试验结果吻合较好,研究成果可为CA砂浆率型本构模型的建立提供试验基础,从而应用于板式轨道的动力设计中。
[Abstract]:Objective: the cement emulsified asphalt mortar (CA) layer is filled between the track plate and the base slab of the CRTS I type ballastless track, which plays the functions of support, load transfer, adjustment, vibration isolation and so on. Therefore, it is necessary to study the mechanical properties of CA mortar. In this paper, four different strain rates of 10-5s-1 / 10-2s-1 are considered. Under the dual control of displacement and strain rate, the full stress-strain curve of the order shaft is issued under the dynamic loading condition. The strain rate effect and constitutive equation of mechanical parameters such as compressive strength, peak strain and elastic modulus are studied. The compressive strength, elastic modulus and peak strain increase with the increase of strain rate, and the compressive strength is the most sensitive to strain rate. In the range of 10 ~ (-5) s ~ (-1) ~ (-1) ~ (-2) s ~ (-1) strain rate, the strength can be increased about 2.5 times. The shape of stress-strain curve of CA mortar at different strain rates is similar. The stress-strain relationship of CA mortar under different strain rates can be expressed by the rational fraction proposed in this paper. 4) by comparing with the experimental data, it is found that the constitutive equation of CA mortar proposed in this paper is in good agreement with the experimental results at different strain rates. The research results can provide experimental basis for the establishment of CA mortar rate constitutive model and can be applied to the dynamic design of slab track.
【作者单位】：西南交通大学高速铁路线路工程教育部重点实验室;
【分类号】：TU528.42
【正文快照】： 轨道结构在其服役过程中承受列车动态荷载作用,水泥乳化沥青砂浆层(CA砂浆层)作为板式无砟轨道的关键结构层之一,主要承受竖向荷载并且处于动态加载过程[1],因此CA砂浆材料的动态力学性能需要深入研究。CA砂浆是由水泥、乳化沥青、细骨料(砂)、混合料、水、铝粉及功能外加剂等

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