基于路基动应力的路基工作区深度确定方法研究

发布时间：2018-01-13 08:38

本文关键词：基于路基动应力的路基工作区深度确定方法研究　出处：《公路工程》2014年02期 　论文类型：期刊论文

【摘要】：鉴于考虑路面厚度和材料刚度影响的J.Boussinesg修正公式所得的路基工作区深度过小,仅至上路床部位,与实际情况不符。提出了基于竖向路基动应力分布规律确定路基工作区深度的方法。通过比较模型试验和计算模拟在竖向动应力和动位移沿深度方向的衰变规律,发现衰变规律在路基工作区深度范围符合性较好,验证了该方法的正确性与可靠性。对典型结构组合下路基动应力与工作区深度进行计算分析,分析结果表明:在标准汽车荷载100、130 kN作用下,路基顶面动应力为6.4~13.4 kPa,相应的工作区深度为0.6~0.9 m。在重交通和特重交通的汽车荷载170 kN、200 kN作用下,路床顶面动应力为12~20.6 kPa,相应的工作区深度为1.0~1.2 m,已进入上路堤范围0.2~0.4 m。
[Abstract]:Considering the influence of pavement thickness and material stiffness, the depth of subgrade working area obtained by J. Boussinesg correction formula is too small, only the upper road bed. The method of determining the depth of subgrade working area based on dynamic stress distribution law of vertical subgrade is put forward. The decay law of vertical dynamic stress and dynamic displacement along depth direction is simulated by comparing model test and calculation. . It is found that the decay law conforms well to the depth range of the subgrade working area, which verifies the correctness and reliability of the method. The dynamic stress of subgrade and the depth of working area under typical structure combination are calculated and analyzed. The analysis results show that the dynamic stress of the top surface of the roadbed is 6.4% 13.4 kPa under the action of 100,130 KN standard vehicle load. The corresponding working area depth is 0.6 ~ 0.9 m. The dynamic stress on the top of the road bed is 12 ~ 20.6 kPa under the action of the vehicle load of 170kN and extra heavy traffic. The corresponding working area depth is 1.0 ~ 1.2 m, and it has entered the upper embankment area of 0.2 ~ 0.4 m.
【作者单位】：湖南省张桑高速公路建设开发有限公司;湖南省交通科学研究院;
【分类号】：U416.1
【正文快照】： 1概述随着高速、重载交通比重的不断增加,对高等级公路的使用性能也提出了更高的要求。路基作为路面的支撑结构物,对路面的使用性能有重要影响。路基工作区内土的强度和稳定性,对于保证路面结构的强度、稳定性,以及满足行车要求极为重要。因此,准确确定路基工作区深度,对于指

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