摘要
为提升高速公路红黏土路基的承载性能,文中以河南省某高速公路项目为研究对象,通过注水及行车试验对不同车速、轴重和湿度下路基土深度方向及横向动应力值的分布规律进行研究。结果表明,路基土动应力随路基深度及距荷载中心位置距离的增加先快速降低后稳定,深度有效影响范围为0~1.3 m,距中心位置距离影响范围为0~6 m。车速、湿化次数以及轴重越大,路床动应力值越高,轴重对路床动应力的影响程度高于湿度和行车速度。路基深度和距荷载中心位置影响范围内,所有工况下,路基动应力衰减了80%。总之,路基设计应充分考虑运营期路域环境中的交通量以及降雨量。
In order to improve the bearing performance of red clay roadbed in expressway,a highway project in Henan Province was taken as the research object,and the distribution law of soil depth and transverse dynamic stress under different speed,axle load and humidity was stud-ied by water injection and driving test scheme.The results show that the dynamic stress of the subgrade decreases rapidly with the increase of the subgrade depth and the distance from the load center,and then becomes stable.The effective influence range of the depth is O~1.3 m.The distance from the center ranges from O to 6 m.The higher the speed,humidification times and axle load,the higher the dynamic stress val-ue of road bed.The influence of axle load on dynamic stress of road bed is higher than that of humidity and driving speed.The subgrade dy-namic stress attenuates by 80%under all working conditions.In short,in the design process of roadbed,the traffic volume and rainfall in the road area environment during the operation period should be fully considered.
作者
刘冰
Liu Bing(Henan Zhongyuan Highway Survey and Design Co.Ltd.,Puyang,Henan 457000)
关键词
路基工程
红黏土
行车试验
动态力学特性
Roadbed engineering
Red clay
Driving test
Dynamic mechanical properties
作者简介
刘冰(1984-),男,河南濮阳人,本科,高级工程师,主要研究方向为公路桥梁工程。
