The invention discloses an expressway
subgrade structure capable of preventing
subgrade softening, and relates to the technical field of expressways, the expressway
subgrade structure comprises a base body, the base body comprises a
rammed earth layer, a
bedding layer, a water stabilizing layer, a concrete layer and an
asphalt layer, the
rammed earth layer, the
bedding layer, the water stabilizing layer, the concrete layer and the
asphalt layer are sequentially arranged from bottom to top, the
bedding layer is laid on the top of the
rammed earth layer, and the water stabilizing layer is laid on the top of the
asphalt layer. And the bedding layer is matched with the rammed earth layer. According to the invention, the water filtering property of the roadbed is improved through the bedding layer and the water stabilizing layer, and then the collected accumulated water is discharged through the water collecting tank and the water collecting
pipe, so that the drainage speed in the soil base layer is increased, the
viscosity loss caused by excessive water in the soil layer is avoided, and the soil and the accumulated water can be quickly separated in rainy seasons; therefore, the highway roadbed
softening problem is prevented, the highway is prevented from having problems, the blocking net in the water catchment groove blocks soil flowing down along with accumulated water, and the situation that drainage is affected due to the fact that the soil enters a pipeline and the pipeline is blocked is prevented.