摘要
针对编组站驼峰缓行器前端的轨枕埋入式无砟轨道新旧混凝土界面开裂问题,基于断裂力学理论建立了轨枕边缘道床板裂缝稳定性计算模型。通过轨枕周边裂缝处的应力强度因子评价了裂缝稳定性;提出了裂缝修复材料的合理参数取值,并验证了有效性和可行性。结果表明:温度荷载是影响埋入式轨枕周边裂缝稳定性的主要因素,降温幅度越大,轨枕周围道床板的容许初始裂缝深度越小,轨枕越容易松动;为有效限制修复后裂缝的扩展,采用环氧树脂混凝土对编组站缓行器前端无砟轨道的轨枕松动病害进行修复时,应在环境温度15℃左右的春秋季节进行修复工作,修复层厚度在40 mm左右为宜。
Aiming at the cracks in new-old concrete interface of embedded sleeper ballastless track in the front of hump retarder in marshalling station,a computational model for stability of track slab crack on the edge of sleeper is established based on the theory of fracture mechanics.The crack stability is evaluated by the stress intensity factors of the cracks around the sleeper;the reasonable parameters of crack repair materials are proposed,and their availability and feasibility are verified.The results show that the temperature load is the main factor affecting the stability of cracks on the edge of embedded sleeper;the greater the temperature drop,the smaller the allowable initial crack depth of the track slab on the edge of sleeper,and the sleeper tends to loose.In order to limit the expansion of cracks after repair effectively,the loosening sleeper of ballastless track in the front of hump retarder in marshalling station should be repaired by epoxy resin concrete in spring and autumn when the ambient temperature is about 15℃,and the thickness of repairing layer should be about 40 mm.
作者
张光明
杨荣山
魏春城
梁爽
胡猛
常逢文
ZHANG Guangming;YANG Rongshan;WEI Chuncheng;LIANG Shuang;HU Meng;CHANG Fengwen(MOE key Laboratory of High-speed Railway Engineering,Southwest Jiaotong University,Chengdu 610031,China)
出处
《铁道标准设计》
北大核心
2020年第10期35-40,67,共7页
Railway Standard Design
基金
国家自然科学基金项目(51778543)
铁路编组场驼峰轨道设备病害修复技术(CX1985)。
关键词
编组站
新旧混凝土
轨枕周边裂缝
温度荷载
容许裂缝深度
marshalling station
new-old concrete
cracks around the sleeper
temperature load
allowable initial crack depth
