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Semi-flexible pavement interface mesomechanics researching method under vehicle load effect

A semi-flexible pavement and vehicle load technology, applied in the direction of electrical digital data processing, special data processing applications, instruments, etc., can solve the problems of difficult modeling, low accuracy of results, and difficult calculation, so as to improve durability and calculation convenient effect

Inactive Publication Date: 2018-01-09
NANJING FORESTRY UNIV
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Problems solved by technology

[0012] In order to solve the current research on the mesomechanics of the semi-flexible pavement interface, there are many difficulties in modeling, high calculation difficulty, and low accuracy of the results.

Method used

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  • Semi-flexible pavement interface mesomechanics researching method under vehicle load effect

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Embodiment Construction

[0018] The invention provides a method for researching mesomechanics at the semi-flexible pavement interface under vehicle load, and the specific implementation steps are as follows:

[0019] (1) Using discrete element numerical simulation software to build a skeleton structure model of porous asphalt mixture that meets a certain gradation, so that the design void ratio is 28%, and a semi-flexible pavement discrete element model is established according to the cement mortar pouring ratio and asphalt dosage;

[0020] (2) Define the aggregate and cement mortar solidified body in the porous asphalt mixture skeleton as a block that will not break during the simulation process. The asphalt mortar is represented by an independent disk. These three materials are closely connected in the model to ensure The particle distribution uniformity of each component material of the semi-flexible pavement discrete element model;

[0021] (3) Assign calculation parameters to each component mater...

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Abstract

The invention discloses a semi-flexible pavement interface mesomechanics researching method under a vehicle load effect, and belongs to the technical field of pavement materials. The method solves theproblems of many modeling troubles, high calculation difficulty and low result accuracy in current semi-flexible pavement interface mesomechanics researches. The method based on a discrete element method comprises the steps that firstly, discrete element numerical simulation software is adopted to generate a two-dimensional discrete element model in the same grade as an actual semi-flexible pavement bituminous-mixture framework; then, existing functions in the software and a mechanical model are combined to define properties of each constituent material and the interface connection mode of each constituent material separately; finally, simulated vehicle load is added on the basis of the existing models, the mechanical response condition of a semi-flexible pavement interface is monitored during loading, shear force, pull force, pressure stress and displacement of the interface are recorded under the load effect, and the strained condition of the interface is evaluated. The semi-flexible pavement interface mesomechanics researching method has the advantages of being visible in expression, easy and accurate in calculation, wide in application range and applicable to mesomechanics researches of bituminous pavement interfaces.

Description

technical field [0001] The invention relates to a research method of mesomechanics at the interface of semi-flexible pavement under the action of vehicle load, which belongs to the technical field of pavement materials. Background technique [0002] Semi-flexible pavement is a new type of composite pavement structure formed by pouring special cement mortar with good fluidity and high strength based on open-graded large-pore asphalt mixture. Semi-flexible pavement combines the advantages of seamless flexible pavement and high driving comfort with the advantages of strong bearing capacity, good wear resistance and durability of rigid pavement. Semi-flexible pavement is more complex than ordinary pavement due to its paving method and material composition, and its strength formation mechanism is also quite different from that of asphalt mixture. The mechanical state at the interface between porous asphalt mixture skeleton and cement mortar is very complicated, and The weak link...

Claims

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Application Information

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IPC IPC(8): G06F17/50
Inventor 许涛刘方韬汪洋李国芬
Owner NANJING FORESTRY UNIV
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