CRTS Ⅱ型板式无砟轨道高温胀板分布特性与防治研究

Study on Distribution Characteristics and Prevention of Slab Expanding Diseases for CRTS Ⅱ Slab-type Ballastless Track in High Temperature

CRTS Ⅱ型板式无砟轨道在我国高速铁路中得到广泛应用。但在极端高温条件下,其薄弱地段会发生胀板病害,威胁行车安全。本文通过对CRTSⅡ型板式无砟轨道在高温季节的胀板数据大样本进行统计分析,对胀板病害数量与持续高温天数的相关性及沿线路的分布特征进行了研究,并提出了防治措施。结果表明,各地区每公里胀板病害数量与持续高温天数呈明显的正相关性,且胀板病害在连续梁、小半径曲线及大坡度等地段发生的概率较高。研究可为CRTSⅡ型板防胀工作提供数据支撑和决策依据。

CRTSⅡSlab-type Ballastless Track has been widely used for high-speed railways in China.However,under extreme high temperature conditions,the slab expanding will occur in the weak section of the track and may threaten the safety of train’s operation.In this paper,based on the statistical analysis of the large sample of the slab expansion data of CRTSⅡSlab-type Ballastless Track in high temperature season,the correlation between the slab expanding amount and the sustained high temperature days,and the distribution characteristics along the railway are studied.Moreover,some preventive measures are proposed.The results show that the number of slab expanding diseases per kilometer in each region is positively correlated with the duration of high temperature and the probability of slab expanding diseases occurring in the continuous beam,small radius and heavy grade sections.The study results can provide data support and decision-making basis for anti-expansion work of CRTSⅡslab.