CN107576782B - mesomechanics analysis method for semi-flexible pavement under coupling action of vehicle and temperature load - Google Patents
mesomechanics analysis method for semi-flexible pavement under coupling action of vehicle and temperature load Download PDFInfo
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Abstract
The invention discloses a method for analyzing mesomechanics of a semi-flexible pavement under the action of vehicle-temperature load coupling, belongs to the technical field of pavement material research, and solves the problems of single load type, one-sided calculation result, poor accuracy and the like in the existing mesomechanics analysis of the semi-flexible pavement. Firstly, obtaining material parameters of the semi-flexible pavement at different temperatures through indoor tests, and obtaining a temperature correlation function of each parameter through fitting; secondly, establishing a semi-flexible pavement two-dimensional model, and respectively endowing each component material in the model with thermal parameters; then, compiling a program by using a FISH language, and updating the mechanical parameters of each component material obtained by the fitting function along with the change of the material temperature in each step in the calculation process; and finally, simulating vehicle load loading, and monitoring the mesomechanics response condition of the semi-flexible pavement under the coupling action of the vehicle and the temperature load. The invention can also play a role in the microscopic mechanics research of multi-field coupling effect of other pavement types and provides a basis for solving the strength formation mechanism.
Description
Technical Field
The invention discloses a method for analyzing the mesomechanics of a semi-flexible pavement under the coupling action of a vehicle and a temperature load, belonging to the technical field of asphalt pavements.
Background
studies have shown that even with the same macroscopic index of the material, the road properties of roads may show a large difference due to the more complex mesomechanics of the road material. For a long time, due to lack of ways for acquiring microscopic information of materials, research dedicated to pavement mesomechanics is in a theoretical state, but with the progress of modern technologies such as microscopic precision of test equipment, image processing technology, software simulation and the like, research related to pavement mesomechanics is more and more. Due to the fact that the road has fluctuating terrain along the line, the geological features, the landforms and the climatic features are variable, and the developed economic degree and the busy traffic degree of towns along the line are different, the characteristic that the road surface engineering is complex and variable is determined. Due to the characteristics of complexity and variability, the traditional analytical method is difficult to be competent for mechanical analysis of roads under the cyclic action of load, temperature and humidity of moving vehicles, and a numerical simulation method is introduced into road engineering to solve the problems, so that the numerical simulation method has the advantage of being unique, and the application of the numerical simulation in the road engineering is more and more concerned in recent years.
At present, a plurality of numerical simulation software exist in road engineering, wherein the most common method is a finite element method, the method has the advantages of simplicity and convenience in operation, strong adaptability, normative calculation steps, more commercial procedures and the like, and is suitable for establishing an integral model of a pavement for macroscopic analysis. Unlike the finite element method, the discrete element method has an inherent advantage in the microscopic mechanics analysis of the pavement material.
The discrete cell method is a numerical method for displaying a solution. Explicit is in the nature of algebraic equations used in numerical calculations for a physical system. In an explicit solution, the quantities on one side of all equations are known, and the quantities on the other side can be obtained by a simple human substitution. In the discrete-unit method, the interparticle interaction is considered as a dynamic process. The interparticle contact force and displacement are obtained by tracking the movement of the individual particles. This dynamic process is numerically implemented by a time-stepping algorithm. In this algorithm, it is assumed that the velocity and acceleration remain constant at each time step. This method is equivalent to the explicit finite difference method used in continuous media analysis. The discrete unit method is based on the idea that: the time step is sufficiently small that, within a single time step, the motion of a particle only affects directly adjacent particles and does not propagate to other non-adjacent particles. Thus, the force acting on each particle is determined only by the particle with which it is in direct contact. The calculation method enables the model simulation to be closer to the road surface working state under the real condition.
the semi-flexible pavement is a novel composite pavement structure type formed by pouring special cement mortar with good fluidity and high strength by taking open-graded macroporous asphalt mixture as a matrix, and the novel pavement has the advantages of no seam on the flexible pavement and high driving comfort and the advantages of strong bearing capacity, high wear resistance and high durability on the rigid pavement. The semi-flexible pavement is more complex in paving mode and constituent materials compared with the ordinary pavement, and the strength forming mechanism of the semi-flexible pavement is greatly different from that of an asphalt pavement and a cement pavement.
the asphalt pavement is a flexible pavement, the asphalt material is a material with strong temperature sensitivity, the mechanical properties of the asphalt pavement can be greatly changed under the conditions of high temperature in summer and low temperature in winter, meanwhile, the diseases such as rutting, cracks and the like are easy to occur under the repeated action of vehicle load, and the porous asphalt mixture framework in the semi-flexible pavement also has similar characteristics. Therefore, in the process of carrying out the mesomechanics numerical simulation of the semi-flexible pavement, if only the vehicle load or the temperature load of the semi-flexible pavement is considered, the simulation result is one-sided and inaccurate.
in the aspect of road surface numerical simulation, the research on the mesomechanics of the existing road surface materials is almost the simulation analysis performed when a force field and a temperature field act independently, but the real working state of the road surface is influenced by multiple factors in the actual use of the road surface, and the problem is difficult to solve by the existing numerical simulation method. The problem of multi-field coupling is that attention is paid to the multi-field coupling problem in recent years, and the research on a road surface micro-mechanical analysis method under the coupling action of vehicle-temperature load is less. The method adopts a discrete element method, simultaneously calls two mechanical and thermal modules, performs numerical simulation on the semi-flexible pavement under the action of vehicle-temperature load coupling, explores the mesoscopic mechanical behavior of the semi-flexible pavement, and more accurately reveals the actual working state and the failure mechanism of the semi-flexible pavement.
disclosure of Invention
(1) Technical problem
The invention aims to provide a method for analyzing the mesomechanics of a semi-flexible pavement under the coupling action of a vehicle and a temperature load, which realizes the mesomechanics simulation of the semi-flexible pavement under the coupling action of the vehicle and the temperature load by establishing a function of the mesoscopic parameters and the temperature change of the semi-flexible pavement, simultaneously applying a mechanical and thermal module to write a program in numerical simulation software, and adopting a real-time updating mode in the loading process of simulated vehicle loads, thereby solving the problems of the current mesomechanics analysis method under the multi-field coupling action of the semi-flexible pavement, such as lack, single load type, one-sided calculation result, poor accuracy and the like.
(2) technical scheme
in order to solve the problems of single load type, one-sided calculation result, poor accuracy and the like in the existing mesomechanics analysis of the semi-flexible pavement, the method is based on a discrete element method, firstly, material parameters of the semi-flexible pavement at different temperatures are obtained through indoor tests, and temperature correlation functions of the parameters are obtained through the fitting of discrete element analysis software; secondly, establishing a semi-flexible pavement two-dimensional model in discrete element simulation software, and respectively endowing each component material in the model with thermal parameters; then, a software built-in FISH language is used for compiling a program, and each component material mechanical parameter obtained by a fitting function is updated along with the change of the material temperature in each step in the calculation process; and finally, simulating vehicle load loading, and monitoring the mesomechanics response condition of the semi-flexible pavement under the coupling action of the vehicle and the temperature load.
(3) Advantageous effects
compared with the traditional theoretical calculation method, the method has the advantages of simple and convenient calculation and visual performance; compared with the test method, the method can overcome the adverse factors in the test process, such as water damage and the influence of photo-aging, and is more economical. Under the background, a semi-flexible pavement is used as a pavement structure with high temperature sensitivity, the influence of temperature field change on the mechanical property of the semi-flexible pavement is not negligible, but in a numerical simulation method, the problem of coupling of a temperature field and a force field is difficult to solve, and particularly on a microscopic level, a better solution is lacked. The mesomechanics analysis method of the semi-flexible pavement under the coupling action of the vehicle and the temperature load, which is provided by the invention, can well solve the problems in the current numerical simulation method of the semi-flexible pavement, and can also play a good role in the mesomechanics research of the multi-field coupling action of other pavement types, thereby laying a foundation for further research and having higher scientific value; meanwhile, a theoretical basis can be provided for the strength forming mechanism of the semi-flexible pavement, the expenses required by the test are saved, and the economic benefit is better.
Detailed Description
The invention provides a mesomechanics analysis method of a semi-flexible pavement under the coupling action of a vehicle and a temperature load, which comprises the following specific implementation steps:
(1) Obtaining material parameters of each component of the semi-flexible pavement at different temperatures through an indoor test, converting the material parameters into microscopic parameters, and fitting the microscopic parameters into a correlation function of the temperature and the material parameters in numerical analysis software, wherein the material parameters comprise an element parameter of a Bituminous material Burger model and a material interface bonding parameter;
(2) Establishing a semi-flexible pavement two-dimensional model in discrete element software, defining aggregate and cement mortar as blocks which cannot be broken in a simulation process, representing asphalt mortar by using independent discs, and closely connecting the three materials in the model to ensure that particles of all the components are uniformly distributed;
(3) respectively measuring the heat capacity, the heat conductivity coefficient and the thermal expansion coefficient of each component material of the semi-flexible pavement, respectively endowing the measured heat capacity, the measured heat conductivity coefficient and the measured thermal expansion coefficient to each component material in the model in discrete element software, and endowing the surface layer initial temperature of the discrete element model of the semi-flexible pavement according to the highest practical use temperature of the pavement;
(4) Writing a program by using a software built-in FISH language, controlling each time step in the simulation calculation process, extracting the temperature of each division unit in the semi-flexible pavement two-dimensional model, and endowing mechanical parameters to the material according to the correlation function of the temperature and the material parameters fitted in the step (1) to realize that the mechanical parameters of the semi-flexible pavement two-dimensional model change along with the change of a temperature field;
(5) Applying simulated vehicle load on the discrete element model of the semi-flexible pavement through a servo mechanism, controlling the size of the vehicle axle load to be stabilized within the range of error not more than 5%, and enabling the loading acting time and interval of the simulated vehicle to be consistent with the acting time and interval of the actual wheel load;
(6) Measuring points are arranged below and outside the vehicle load action center at a certain distance, the temperature field distribution, stress and displacement change conditions of the semi-flexible pavement under the simulated vehicle-temperature load coupling action are recorded, the microscopic stress state of the semi-flexible pavement is evaluated, controllability indexes and standards are provided, the design of the semi-flexible pavement is guided, and the cracking of the semi-flexible pavement is reduced.
Claims (1)
1. The method for analyzing the mesomechanics of the semi-flexible pavement under the coupling action of the vehicle and the temperature load is characterized by comprising the following specific steps:
(1) Obtaining material parameters of each component of the semi-flexible pavement at different temperatures through an indoor test, converting the material parameters into microscopic parameters, and fitting the microscopic parameters into a correlation function of the temperature and the material parameters in numerical analysis software, wherein the material parameters comprise an element parameter of a Bituminous material Burger model and a material interface bonding parameter;
(2) Establishing a semi-flexible pavement two-dimensional model in discrete element software, defining aggregate and cement mortar as blocks which cannot be broken in a simulation process, representing asphalt mortar by using independent discs, and closely connecting the three materials in the model to ensure that particles of all the components are uniformly distributed;
(3) respectively measuring the heat capacity, the heat conductivity coefficient and the thermal expansion coefficient of each component material of the semi-flexible pavement, respectively endowing the measured heat capacity, the measured heat conductivity coefficient and the measured thermal expansion coefficient to each component material in the model in discrete element software, and endowing the surface layer initial temperature of the discrete element model of the semi-flexible pavement according to the highest practical use temperature of the pavement;
(4) writing a program by using a software built-in FISH language, controlling each time step in the simulation calculation process, extracting the temperature of each division unit in the semi-flexible pavement two-dimensional model, and endowing mechanical parameters to the material according to the correlation function of the temperature and the material parameters fitted in the step (1) to realize that the mechanical parameters of the semi-flexible pavement two-dimensional model change along with the change of a temperature field;
(5) Applying simulated vehicle load on the discrete element model of the semi-flexible pavement through a servo mechanism, controlling the size of the vehicle axle load to be stabilized within the range of error not more than 5%, and enabling the loading acting time and interval of the simulated vehicle to be consistent with the acting time and interval of the actual wheel load;
(6) Measuring points are arranged below and outside the vehicle load action center at a certain distance, the temperature field distribution, stress and displacement change conditions of the semi-flexible pavement under the simulated vehicle-temperature load coupling action are recorded, the microscopic stress state of the semi-flexible pavement is evaluated, controllability indexes and standards are provided, the design of the semi-flexible pavement is guided, and the cracking of the semi-flexible pavement is reduced.
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| CN109241636B (en) * | 2018-09-11 | 2023-03-24 | 合肥工业大学 | Finite element-based road surface structure multi-physical field coupling numerical simulation method |
| CN110362962B (en) * | 2019-08-16 | 2023-04-07 | 武晓勇 | Road surface damage calculation method based on discrete element method |
| CN110728092A (en) * | 2019-10-22 | 2020-01-24 | 陕西铁路工程职业技术学院 | Method for establishing and using temperature coupling model of mixed asphalt pavement structure |
| CN111597712B (en) * | 2020-05-15 | 2022-05-13 | 王开森 | Calculation method for movement of vehicle in discrete meta-model |
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Application publication date: 20180112 Assignee: BEIJING JIUTONGQU TESTING TECHNOLOGY Co.,Ltd. Assignor: NANJING FORESTRY University Contract record no.: X2020320000364 Denomination of invention: Micromechanical analysis method of semi flexible pavement under vehicle temperature load coupling Granted publication date: 20191206 License type: Common License Record date: 20201212 Application publication date: 20180112 Assignee: Zhenjiang Heng An Civil Technology Co.,Ltd. Assignor: NANJING FORESTRY University Contract record no.: X2020320000365 Denomination of invention: Micromechanical analysis method of semi flexible pavement under vehicle temperature load coupling Granted publication date: 20191206 License type: Common License Record date: 20201212 Application publication date: 20180112 Assignee: Hefei Shuang Dao run Highway Engineering Co.,Ltd. Assignor: NANJING FORESTRY University Contract record no.: X2020320000369 Denomination of invention: Micromechanical analysis method of semi flexible pavement under vehicle temperature load coupling Granted publication date: 20191206 License type: Common License Record date: 20201212 |
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