轨道板与CA砂浆间拍打作用研究  

Study on the flap action between slab and CA mortar

作　　者：谢露[1] 赵春光[1] 苏乾坤 刘学毅[1] 杨荣山[1] 

机构地区：[1]西南交通大学高速铁路线路工程教育部重点实验室,四川成都610031

出　　处：《铁道科学与工程学报》2017年第4期675-681,共7页Journal of Railway Science and Engineering

基　　金：国家自然科学基金重点资助项目(U1434208);国家自然科学基金资助项目(51278431)

摘　　要：因温度和列车动荷载等因素影响,CRTSⅠ型轨道板与CA砂浆间易产生离缝及拍打作用。采用瞬态动力分析方法研究轨道板与CA砂浆间的拍打速度,利用碰撞模拟两者间的拍打作用。研究结果表明:拍打速度随轴重呈线性增加关系,且在250 km/h时速下拍打作用最大,拍打速度为0.581 m/s;接触应力随拍打速度呈线性增加关系,随CA砂浆弹模的增加,在200 MPa前增加较快,大于200 MPa时,增加变缓,建议采用弹模小于200 MPa的CA砂浆或在离缝和脱空区域内填充弹模较小的材料。Because of the influence of temperature and train dynamic load, the places between slab and CA mortar of CRTS I slab ballastless track easily generate gaps and the flap action. A method of transient dynamic analysis was used to study the flap speed between the slab and the CA mortar, and then the collision was used to simulate the flap action. The results show that： Flap speed between slab and CA mortar increases linearly with the increase of axle load, and at the train speed of 250 km/h, flap action is biggest and flap speed is 0.581 m/s; The contact stress between the slab and the CA mortar increases linearly with the flap speed, it also increases with the elastic modulus of CA mortar-when the contact stress is less than 200 MPa, its increase is faster; when the contact stress is larger than 200 MPa, its increase is mitigation. The CA mortar with elastic modulus less than 200 MPa is recommended to use or the materials with smaller elastic modulus are filled in gap and void areas.

关 键 词：CRTSI型板轨道 离缝 拍打作用 瞬态动力分析 碰撞 

分 类 号：U213.212[交通运输工程—道路与铁道工程]