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从力学角度出发,以路基在长期交通荷载作用下不至于变形过大为主要目的,利用动变形控制法,针对路基高度与湿度的相互关系进行了研究。首先,通过室内试验获得了路基土体回弹模量与湿度及压实度的定量关系式;同时基于层状公路结构动力响应解及路基、路面协调变形原理,获得了路基顶面动变形控制标准。结合试验结果和路基顶面动变形控制标准,建立了路基湿度、压实度与路基高度之间的联系。最后,以两种典型沥青混凝土公路结构为例,编制程序进行了数值计算,分析了满足动变形条件下的路基临界高度随路基湿度、压实度的变化规律。结果表明:路基临界高度随着路基湿度的增加而增大。路基湿度低于最优含水率时,路基临界高度随路基湿度和压实度的变化均较小;路基湿度高于最优含水率时,路基临界高度迅速增大,且压实度对临界高度的影响也变得十分显著。研究结果为路基高度和湿度的合理取值提供了新的思路。
From the mechanical point of view, the main purpose of the subgrade is not to be over deformed under the long-term traffic load. The dynamic deformation control method is used to study the relationship between subgrade height and humidity. First of all, the quantitative relationship between the elastic modulus and the moisture content and compaction degree of the subgrade soil was obtained through laboratory tests. At the same time, based on the dynamic response of the layered highway structure and the coordinated deformation of subgrade and pavement, standard. Combined with the test results and the control standards of dynamic deformation of the subgrade surface, the connection between subgrade wetness and compaction degree and subgrade height was established. Finally, taking two kinds of typical asphalt concrete highway structure as an example, the numerical calculation is made in the program, and the variation rule of subgrade criticality and compaction degree under dynamic deformation is analyzed. The results show that the critical height of subgrade increases with the increase of subgrade humidity. When subgrade humidity is lower than the optimal moisture content, the subgrade critical height changes little with subgrade wettability and compaction degree. When the subgrade humidity is higher than the optimal moisture content, the subgrade critical height rapidly increases, and the compaction degree to critical height The impact has also become quite significant. The results provide a new idea for the reasonable value of subgrade height and humidity.