高速铁路CRTSⅢ型轨道板隔离层关键构件-弹性垫板试验  

Experimental investigation on rubber pad-the key component of isolation layer in CRTS Ⅲ track of high-speed railway

作　　者：蒋丽忠[1,2] 刘丽丽 周旺保[1,2] 彭东航[1] 冯玉林 JIANG Lizhong;LIU Lili;ZHOU Wangbao;PENG Donghang;FENG Yulin(School of Civil Engineering,Central South University,Changsha 410075,China;National Engineering Research Center of High-speed Railway Construction Technology,Changsha 410075,China;School of Civil Engineering and Architecture,East China Jiaotong University,Nanchang 330013,China)

机构地区：[1]中南大学土木工程学院,湖南长沙410075 [2]高速铁路建造技术国家工程研究中心,湖南长沙410075 [3]华东交通大学土木建筑学院,江西南昌330013

出　　处：《铁道科学与工程学报》2023年第1期1-11,共11页Journal of Railway Science and Engineering

基　　金：国家自然科学基金资助项目(U1934207,52078487,51778630);湖南省创新型省份建设专项经费资助项目(2019RS3009)。

摘　　要：弹性垫板作为自密实混凝土填充层和底座板之间的缓冲构件,通过自身压缩变形达到减震耗能的目的,因此弹性垫板在平面压缩情况下的力学性能对CRTSⅢ型板式无砟轨道系统的抗震特性具有显著影响。为研究弹性垫板在平面压缩情况下的力学性能,开展弹性垫板的平面压缩试验。探究不同截面尺寸、不同厚度情况下弹性垫板试件的荷载-位移曲线变化规律,探讨弹性垫板试件在平面压缩情况下的刚度变化规律,提出考虑尺寸效应的弹性垫板荷载-位移力学模型。并利用该荷载-位移力学模型与弹性垫板平面压缩的试验数据进行对比。研究结果表明:弹性垫板荷载-位移力学模型能有效模拟弹性垫板的平面压缩力学特性;不同弹性垫板试件的荷载-位移曲线形状大体一致,均表现为位移随着荷载的增加非线性增大;弹性垫板的截面面积和厚度均对弹性垫板的荷载-位移曲线有显著影响,表现为相同荷载情况下,截面面积越大,厚度越小,弹性垫板的位移越小;弹性垫板试件的割线刚度与截面面积、厚度有关,表现为截面面积越大,厚度越小,弹性垫板割线刚度越大,平面可压缩性越低。As a buffer member between the self-compacting concrete filling layer and the base slab, the rubber pad achieves the purpose of damping and energy consumption through its own compression deformation.Therefore, the mechanical properties of the rubber pad under plane compression have a significant impact on the seismic characteristics of CRTS Ⅲ slab ballastless track system. In order to study the mechanical properties of rubber pad under plane compression, a load-displacement mechanical model was established, considering size effect. A group of plane compression tests of rubber pad were designed. The variation laws of load-displacement curve of rubber pad specimens under different section size and thickness were explored. The stiffness variation law of rubber pad specimen under plane compression was discussed. The load-displacement mechanical model of rubber pad was proposed. The results show that the load-displacement mechanical model of rubber pad can effectively simulate the plane compression mechanical characteristics of rubber pad. The shapes of loaddisplacement curves of different rubber pad specimens are roughly the same, and the displacement increases nonlinearly with the increase of load. The section size and thickness of the rubber pad specimens have a significant effect on the load-displacement curve. Under the same load, the larger the section size and the smaller the thickness, the smaller the displacement of the rubber pad. The secant stiffness of rubber pad specimens are related to the section size and thickness. The larger the section size and the smaller the thickness, the greater the secant stiffness of the rubber pad and the lower the plane compressibility.

关 键 词：高速铁路 CRTSⅢ型板式无砟轨道系统 弹性垫板 力学模型 试验 

分 类 号：U442.55[建筑科学—桥梁与隧道工程]