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工程力学  2015 

桥上CRTSII型道岔板砂浆离缝影响特性研究

DOI: 10.6052/j.issn.1000-4750.2013.12.1135, PP. 124-132

Keywords: 离缝,CA砂浆,道岔板,桥上纵连板式无砟道岔,温度荷载

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Abstract:

水泥乳化沥青砂浆离缝是桥上纵连板式无砟轨道主要伤损型式之一。参考18号无砟道岔的结构形式,简化建立桥梁-纵连板式道岔垂向耦合静力和动力分析模型,应用有限单元法,计算分析了不同程度的道岔板下砂浆离缝对道岔结构变形及受力影响。研究表明,板下砂浆层发生离缝,对道岔板及钢轨的影响较底座板更明显。不同离缝形式对结构的影响程度不同,当离缝发生在板端时,道岔结构受力与变形最不利;发生在板中时,道岔板的翘曲位移变化不明显。依据计算结果得出板底砂浆离缝尺寸对道岔结构的影响规律,同时从无砟轨道稳定性角度出发,初步提出砂浆离缝尺寸限值,道岔板下砂浆离缝垂向高度低于1.8mm,沿线路纵向离缝长度小于0.7mm。

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