土石混填路基工作区的特性及其影响因素

Abstract

我国现行规范关于路基工作区的确定方法缺乏对路基填料性质，交通荷载及路面结构形式等方面的考虑，存在较大的局限性。基于上述状况研究土石混填路基的路基工作区深度的影响因素。利用BISAR3.0程序计算不同工况下土石混填路基的路基工作区深度。研究结果显示，与砂土、粘土路基相比，土石混填路基的工作区深度较大，其值随土石比增大而减小；土石混填路基工作区深度随着轴载增大而增大，两者呈线性关系；路面结构越完善，土石混填路基工作区深度越小。旧版规范将路基顶面以下0~80cm部分作为路基工作区不适用于所有公路，根据公路实际工况进行计算能够更合理地确定土石混填路基工作区深度，确保路基施工质量。 China's current codes about the determination method of the subgrade work area lack consideration of the thickness of the subgrade’s fill material, traffic load and subgrade moisture content. There is a big limitation. This paper studies the influencing factors of the depth of the subgrade working area in highway. The BISAR 3.0 program is used to calculate the depth of the soil-rock filled subgrade working area in highway under different working conditions. The results show that the depth of the soil-rock filled subgrade working area is larger than that of sandy subgrade and clay subgrade, and it decreases with the increase of soil-rock ratio. The depth of the soil-rock filled subgrade working area is increasing with the increase of the axle load; the linear relationship exists between them. The higher the water content of the subgrade soil, the smaller the depth of the subgrade work area in a certain range. The older version stipulates that the following 0 to 80 cm below the top of the subgrade as a subgrade working area does not apply to all roads; according to the actual conditions of the road, calculating the depth of the soil-rock filled subgrade working area in highway can be more reasonable and ensure the quality of subgrade construction.