摘要
为研究砂浆在列车荷载作用下、不同初始弹性模量时的黏弹性变形规律,以黏弹性理论与时间硬化率分析方法为基础,拟合得到砂浆的时间硬化率特征参数,通过ABAQUS建立基于时间硬化率的CRTS I型板式无砟轨道实体模型。研究结果表明:基于时间硬化率的分析模型能很好地模拟砂浆变形行为,拟合得到的特征参数较为合理;若砂浆初始弹性模量增大,则砂浆在黏弹性变形前、后应变差值逐渐减小,位移差值逐渐增大,位移差值集中于0.2~0.6 mm,变形敏感部位约在板端2.5个扣件间距处。砂浆本身黏弹性特征引起的不可恢复变形是导致砂浆与轨道板层间离缝的重要原因之一。
To study the viscoelastic deformation laws of CA mortar with different initial Young's modulus under cyclic train loads,the viscoelastic parameters of mortar were fitted according to the equation of time hardening rate,and the model of CRTS I slab track was established through ABAQUS,based on the viscoelasticity theory and the strain analysis of time hardening rate.The results show that the viscoelastic performance of mortar can be described well with the model of time hardening rate,and the fitted viscoelastic parameters are reasonable.With the increase of the initial Young's modulus of mortar,the strain difference of mortar before and after its deforming gradually decreases,while its displacement difference increases gradually ranging from 0.2 mm to 0.6 mm.The deformation is mainly distributed on the slab end,which is about 2.5 times of the fastening spacing longitudinally.The viscoelastic performance of mortar produces an irreversible deformation,which plays a significant role in leading to the contact loss between the mortar layer and the track slab.
作者
任娟娟
李浩蓝
杜威
邓世杰
田根源
巫江
REN Juanjuan;LI Haolan;DU Wei;DENG Shijie;TIAN Genyuan;WU Jiang(MOE Key Laboratory of High-speed Railway Engineering,Southwest Jiaotong University,Chengdu 610031,China;School of Civil Engineering,Southwest Jiaotong University,Chengdu 610031,China;China Railway Eryuan Engineering Group Co.Ltd.,Chengdu 610031,China)
出处
《中南大学学报(自然科学版)》
EI
CAS
CSCD
北大核心
2019年第3期743-751,共9页
Journal of Central South University:Science and Technology
基金
国家自然科学基金资助项目(51578472
51778543)~~
关键词
板式无砟轨道
CA砂浆
黏弹性
时间硬化率
prefabricated slab track
CA mortar
viscoelasticity
time hardening rate