Method for analyzing stress of an asphalt pavement structure in different interlayer bonding states
An asphalt pavement, interlayer bonding technology, applied in special data processing applications, instruments, electrical digital data processing, etc., can solve the problem of neglecting contact thermal resistance, unable to change the contact geometric characteristics of aggregates, unable to characterize the porous discontinuous structure of asphalt pavement characteristics and other issues, to achieve the effect of large promotion value and accurate simulation effect
Pending Publication Date: 2019-11-19
NANJING FORESTRY UNIV
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[0014] In order to solve the problems that the current finite element modeling cannot characterize the porous and discontinuous structure characteristics of asphalt pavement, cannot change the contact geometric characteristics of aggregates, and ignores contact thermal resistance, etc., the present invention provides a force analysis method for asphalt pavement structure under different interlayer bonding states
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[0020] The present invention proposes a stress analysis method for asphalt pavement structure under different interlayer bonding states, and the specific implementation steps are as follows:
[0021] (1) Use two-dimensional discrete element software to build an asphalt pavement structure model with a definite gradation for each layer, and use the block command to form particle units into irregular shapes to represent aggregates, and the remaining circular particle units are regarded as asphalt mortar. Define The block formed by the collection of particles will not break, and the gravity is set to constrain the circular particles of each component material to be closely arranged;
[0022] (2) In the discrete element mechanics analysis module, set the physical parameters of the materials of each layer of the pavement structure, select the viscoelastic contact model and the parallel bond model to characterize the contact between the interior of the asphalt mortar and the contact b...
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The invention provides a method for analyzing stress of an asphalt pavement structure in different interlayer bonding states, and belongs to the technical field of asphalt pavements. The problems thatat present, modeling of pavement structures in different interlayer bonding states is inaccurate, and results have errors are solved. The method comprises the following steps: generating an asphalt pavement structure initial model with determined gradation of each layer by adopting discrete element software; secondly, setting corresponding boundary conditions, physical parameters of a material ina pavement structure layer and a contact model among unit particles, and establishing a discrete element mechanical analysis model; and finally, using a servo mechanism for simulating vehicle loads to load the asphalt pavement in different combination states, monitoring tensile stress, shear stress, tensile strain and pavement surface deflection value data at the load positions of all structurallayers of the pavement, drawing a stress data comparison graph, and analyzing the stress conditions of the asphalt pavement structure in different interlayer combination states. The method provided bythe invention is visual, simple and convenient, accurate in calculation data, and suitable for simulating various asphalt pavements in different interlayer states.
Description
technical field [0001] The invention relates to a force analysis method for an asphalt pavement structure under different interlayer bonding states, and belongs to the technical field of asphalt pavement. Background technique [0002] In recent years, my country's road transportation construction has developed rapidly, and asphalt roads have become the main type of road construction due to their high smoothness, short construction period, and convenient maintenance. The design of asphalt pavement in my country adopts the theory of elastic layered design. Asphalt pavement is generally composed of surface layer, base layer, subbase layer and subgrade. Different layers use different materials according to their functions. Based on the performance of asphalt materials much higher than that of cement concrete pavement, the surface layer material is mainly made of asphalt mixture according to different mixing ratios, and is generally divided into upper, middle and lower layers. A...
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IPC IPC(8): G06F17/50
Inventor 许涛许俊杰李宁王宏畅
Owner NANJING FORESTRY UNIV
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