高速公路土石混填路基工作区深度的计算分析

运用BISAR3.0程序计算不同工况下高速公路土石混填路基的路基工作区深度。研究结果表明:土石混填路基与砂土、黏土路基相比，工作区深度较大，其值随土石比增大而减小。当轴载增大时，土石混填路基工作区的深度增大，两者呈线性关系；在一定范围内，路基土石混合物含水率越大，工作区深度越小。现行规范将路基顶面以下0～80 cm部分作为路基工作区不适用于所有公路，高速公路土石混填路基工作区深度应根据公路的实际工况进行计算。

Calculation and Analysis of the Depth of Rock-soil Filled 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 working area is increasing with the increase of the axle load and 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 current codes stipulate that the following 0 to 80 cm below the top of the subgrade as a subgrade working area does not apply to all roads. The depth of the soil-rock filled subgrade working area in highway should be calculated according to the actual conditions of the road.