研究目的：温度应力是高速铁路无砟轨道结构稳定的重要影响因素。本文主要以CRTSⅡ 型板式无砟轨道结构的脱空病害为研究对象,通过有限元软件进行建模分析,在考虑轨道结构自重以及轨道层间相互作用的条件下,探究正负温度梯度作用对不同位置、不同面积的轨道板与CA砂浆层间脱空病害发展规律的影响,为CRTSⅡ型轨道板脱空的病害防治工作提供理论依据。
研究结论：(1)温度梯度作用下,轨道板产生的脱空高度会随初始脱空尺寸的增加而逐渐增加,其增长规律因初始脱空所处位置的不同而存在差异,当轨道板初始脱空区域超过70％,板中最大脱空高度可达到10 mm;(2)初始脱空尺寸会影响温度作用后轨道板内部的变形以及轨道结构的脱空面积,总脱空面积的增长近乎于线性;(3)在高速铁路无砟轨道结构的实际运营中,必须严控轨道板与CA砂浆层间的黏结质量,避免初始脱空、离缝在温度作用下急剧扩展造成轨道结构稳定性严重下降的不利情况发生。
Abstract
Research purposes: Temperature stress is an important factor affecting the structural stability of ballastless track in high-speed railway. This paper took the void disease of CRTS Ⅱ slab ballastless track structure as the research object, and used the finite element software for modeling and analysis. The influence of positive and negative temperature gradients on the development law of the void disease between track slab and CA mortar layer was investigated by considering the weight of the track structure and the interaction between the track layers, to provide a theoretical basis for the prevention and control of the void disease of CRTS Ⅱ track.
Research conclusions: (1) Under the action of temperature gradient, the void height gradually increases with the initial void size, and the growth is different due to the different positions of initial void. When the initial void exceeds 70%, the maximum void height can reach 10 mm. (2) The size of initial void can affect the internal deformation and the void area of the track under the effect of temperature, and the total void area increases almost linearly. (3) In the actual operation of ballastless track structure of high-speed railway, the bonding quality between track plate and CA mortar layer must be strictly controlled, to avoid the adverse condition that the stability of track structure seriously declines due to the rapid expansion of initial void and separation joint under the temperature.
关键词
脱空面积 /
脱空高度 /
CRTSⅡ型板式无砟轨道 /
CA砂浆层 /
温度梯度
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Key words
void area /
void height /
CRTS Ⅱ slab ballastless track /
CA mortar layer /
temperature gradient
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中图分类号：
U213.2+42
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参考文献
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脚注
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基金
国家自然科学基金(51808033)
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