A Back Calculation Method of Asphalt Pavement Modulus

Abstract

The invention discloses a modulus back calculation method for a bituminous pavement. The modulus back calculation method comprises the following steps: simplifying pavement structure layers of the bituminous pavement, taking the adjacent pave3ment structure layers with same material type as simplified layers, and regarding a soil matrix as a soil matrix layer independently, wherein the modulus difference value among the structure layers contained in each simplified layer is not greater than N MPa; arranging vertical strain sensors in the soil matrix layer and each simplified layer, and guaranteeing that all the vertical strain sensors after arrangement are positioned in the same vertical direction; applying load on the surface layer of the bituminous pavement, and collecting vertical strain data of the soil matrix layer and the simplified layers through the vertical strain sensors, wherein the load is positioned over each vertical strain sensor; and taking the collected vertical strain data as back calculation parameters for carrying out modulus back calculation, wherein the value of N is 250 to 350. Through the method, the original structure is combined and simplified, so that the modulus back calculation process is optimized, and the technical problem that the back calculation modulus disaccords with the actual state is solved.

Description

[0001] Field [0002] The invention relates to an inverse calculation method for asphalt pavement modulus, which belongs to the technical field of road engineering. Background technique [0003] Asphalt pavement modulus inversion is an important means of pavement structural performance evaluation, providing construction and maintenance parameters for old and new pavement. At present, the existing modulus inversion methods all use the FWD deflection basin as the inverse calculation parameter, supplemented by some mathematical optimization means, and are widely used at home and abroad, but there are many shortcomings: inverse calculation using the road surface deflection basin As a result, the inverse calculated modulus is inconsistent with the actual modulus; especially the inverse calculation results of structural layers that are not sensitive to displacement are very different from the actual ones. These deficiencies seriously affect the maintenance evaluation of pavement st...

AI Technical Summary

Problems solved by technology

At present, the existing modulus inversion methods all use the FWD deflection basin as the inverse calculation parameter, supplemented by some mathematical optimization method, and are widely used at home and abroad, but there are many shortcomings: the inverse calculation is carried out with the road surface deflection basin The inverse calculated modulus is inconsistent with the actual modulus; especially the inverse calculation results of structural layers that are not sensitive to displacement are very different from the actual ones

These deficiencies seriously affect the maintenance evaluation of pavement structures

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