Permanent pavement design method

Abstract

The invention discloses a permanent pavement design method which belongs to the field of road engineering. The method comprises the following steps: using asphalt mixture ultimate tensile strain as a design index, using a vehicle axle load spectrum, a pavement temperature field and a pavement material dynamic modulus as design parameters, and combining a computer simulation technology and an elastic laminar mechanics theory to obtain pavement structural strain distribution approaching to a true state so as to accurately predict the pavement life and design a pavement structure with long life. Compared with a traditional design method, the invention solves the important technical difficult problem that the pavement structure designed by the traditional design method needs periodic reconstruction, realizes the goals of durability, economy and environmental protection of the pavement structure and has good popularization and application value.

Description

technical field [0001] The invention relates to the field of road engineering, and specifically provides a permanent road surface design method. Background technique [0002] my country's current highway pavement structure is dominated by semi-rigid base asphalt pavement, with a design life of 15 years. The overall stiffness (bearing capacity) of the pavement structure under the design traffic load (equivalent axle load) and the fatigue cracking damage of the asphalt layer and semi-rigid layer are taken as design indicators. Based on the current design concept, the end-of-use pavement needs to be rebuilt due to structural fatigue damage. Due to the continuous increase in traffic volume and serious overloading and overloading, the active road surface often suffers early damage before reaching the design life, and the pollution and traffic congestion caused by expressway maintenance are also becoming more and more prominent. Accurately designing and predicting pavement servi...

AI Technical Summary

Problems solved by technology

The equivalent method cannot truly reflect the actual traffic and environmental conditions on the road surface, which will affect the reliability of the road surface design

In terms of material parameters, traditional design methods use static modulus to express the physical and mechanical properties of materials. Static modulus cannot reflect the essence of the vehicle's dynamic load on the road surface, and cannot reflect the actual mechanical response state.

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