Semi-rigid base asphalt pavement structure and design method thereof

Abstract

The invention relates to a semi-rigid base asphalt pavement structure and a design method thereof. The pavement structure comprises an asphalt surface layer and a semi-rigid material base layer, wherein the materials and thickness of the asphalt surface layer are determined according to the designed life and cumulative standard equivalent axle loads of a road and the quality classification of the road: for a limestone soil base layer with a plasticity index of 5-14 cubic meters, the thickness of the base layer is selected according to the quality classification of the road; and for another semi-rigid material base layer, the deflection basin area value of a limestone soil base layer with a plasticity index of 5-14 cubic meters and the deflection basin area value of a selected semi-rigid material base layer under the condition of same thickness are determined, the ratio of the deflection basin area value of the limestone soil base layer with a plasticity index of 5-14 cubic meters to the deflection basin area value of the selected semi-rigid material base layer is t, and then the thickness of the base layer is calculated according to the ratio t. Through combining with strength of materials and the area of stress dispersion, the semi-rigid base asphalt pavement structure and design method thereof disclosed by the invention are more scientific and reasonable, so that the cost of a road is reduced, and the service life of the road is prolonged.

Description

technical field [0001] The invention relates to the field of road construction, in particular to the field of highway construction. Background technique [0002] The structural design specification of semi-rigid base asphalt pavement in my country has been adopted for a long time in the "Design Specification for Highway Flexible Pavement" and "Design Specification for Highway Asphalt Pavement". According to this specification, the pavement grade and surface layer type of semi-rigid base asphalt pavement should be determined according to factors such as road grade and usage requirements, cumulative equivalent axle times of standard axle loads within the design life, road construction materials and construction machinery and equipment. The road design traffic volume is based on the initial traffic volume and the estimated traffic volume within a certain design year to calculate the cumulative standard equivalent axis. Therefore, the design year is a reference year for calculat...

AI Technical Summary

Problems solved by technology

[0007] However, the applicant found that the base material of some road sections did not meet the requirements of the specification, and even the thickness of the asphalt layer did not meet the requirements of the specification, and its actual service life was longer

Images