A Method for Determining Optimal Modulus Combination of Structural Layers of Asphalt Pavement

Abstract

The present invention proposes a method for determining the optimal modulus combination of asphalt pavement structural layers. First, the upper, middle, and lower layers are regarded as a whole, and according to the requirements of the value range of elastic modulus in the specification, the median value of the modulus is used as the Unify the modulus of the surface layer, select n groups of base layer modulus ratios; then input the surface layer modulus, n groups of base layer modulus ratios, and the thickness of each structural layer into the finite element software to obtain the asphalt pavement in different base layers The influence of the mechanical response of the design index under the modulus ratio of the surface layer is determined to determine the optimal modulus ratio of the base layer; finally, according to the requirements in the specification for the range of elastic modulus of inorganic binder-stabilized materials, guarantee the upper and middle , the average value of the lower three surface layers is the median value of the modulus of the entire surface layer, change the modulus gradient of the upper layer and the lower layer, adjust the modulus of the upper layer and the lower layer, and take the upper, middle, and lower three surface layer moduli of group m The combination of weight groups; this method realizes the combination of the optimal base layer modulus ratio and the optimal surface layer modulus group.

Description

technical field [0001] The invention belongs to the technical field of highway pavement design, in particular to a method for determining the optimal modulus combination of asphalt pavement structural layers. Background technique [0002] At present, the asphalt concrete pavement structure of inorganic binder stable base is widely used in our country. stability characteristics. And the resulting reflective cracks in the asphalt pavement. [0003] Among the high-grade highways that have been built and opened to traffic in my country, more than 90% are based on inorganic binder stabilized base asphalt pavement with asphalt concrete as the surface layer. Inorganic binder-based stable bases have high strength and bearing capacity, good overall stability and durability, and provide a reliable guarantee for the realization of a "strong base and thin surface" structure. In view of the inherent characteristics of the semi-rigid base material itself, it is almost inevitable that t...

AI Technical Summary

Problems solved by technology

In view of the inherent characteristics of the semi-rigid base material itself, it is almost inevitable that the asphalt pavement with a semi-rigid base will cause reflective cracks in the cracking of the stable base of the inorganic binder due to the excessive tensile stress at the bottom of the inorganic binder layer during use, thereby affecting The quality of asphalt pavement reduces the service life of asphalt pavement

[0004] In order to effectively reduce the reflective cracks of inorganic binder-stabilized asphalt pavement, systematic research has been carried out from many aspects, and many treatment measures have been given, such as: increasing the content of coarse aggregate in the base material and strictly designing the gradation, increasing Asphalt surface layer thickness, etc., but the effect of these methods is not very ideal

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