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冰川冻土  2013 

列车荷载作用下冻土路基中的动应力计算研究

DOI: 10.7522/j.issn.1000-0240.2013.0165, PP. 1490-1498

Keywords: 列车荷载,冻土路基,温度场,动应力,加速度,位移

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Abstract:

冻土路基在列车荷载作用下的动力响应是一个复杂的热、力相互作用过程,又是一个急需解决的实际工程难题.应用冻土物理学、冻土力学、传热学等基本理论建立冻土路基的动力分析模型,以青藏铁路某普通路基典型断面为例,对冻土路基在列车荷载作用下的动力响应进行了数值模拟,并系统的分析了路基内动应力、位移、加速度等动力响应特点.结果表明普通路基修筑后,在路基及其下部地基中将会产生大片力学性质不稳定的高温冻土层;在列车荷载作用下,路基内土体产生竖向加速度,随着深度增加,加速度波动范围减小,路基顶面中心点加速度波动范围比路基底面中心点大一个量级.路基竖向位移由道砟中心向内部呈圆弧状逐渐减小,整个分布关于路基中线对称;在不同季节的路基上施加列车荷载时,路基顶面的动应力差异不大,但路基底面的动应力差异达7.5kPa.不同季节的路基内动应力随深度的衰减曲线不同,路基表面以下2m和大于15m的深度范围内,差异较小;2~15m的范围内,差异较大.

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