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车辆动载下路基土竖向动应力及扩散规律

DOI: 10.3969/j.issn.1674-0696.2012.04.16, PP. 799-802

Keywords: 车辆动载,路基土,动应力,速度系数,扩散规律,vehicleloads,subgradesoil,dynamicstress,speedcoefficient,diffusedrule

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Abstract:

:?推导了车辆动载作用下路基土中竖向动应力的求解方法,提出用速度系数来表征车辆动载下路基顶面产生的竖向动应力与车辆运行速度的关系,并模拟试验确定了速度系数的取值为0.105。原位监测试验表明:车辆动载在路基顶面产生的竖向动应力值约为0~16kPa,大小与车辆载重及运行速度等因素有关。计算分析了5种类型车辆动载下路基土中竖向动应力的扩散规律。结果显示:随着深度增加,路基土中的竖向动应力逐渐减小,当路基土的深度超过8m时,所有类型车辆荷载在路基土中产生的竖向动应力不到路基顶面的10%;车辆载重越大,竖向动应力扩散速度越慢。

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