CN-115455845-B - Asphalt concrete pavement snow-melting and ice-melting discrete element numerical simulation method

Abstract

The invention discloses a method for simulating discrete element values of snow melting and ice melting of an asphalt concrete pavement. Firstly, a two-dimensional discrete element sample model of an asphalt concrete pavement and an ice surface is established, different micro-mechanical parameters are given to different bonding types, the mass loss of ice particles, the quantity of generated liquid and the new size of the ice particles at the current time point are calculated at intervals after heat is transferred to an ice layer, the melting rate of the ice layer is transferred to a CFD field, and then the CFD calculates the temperature field in the ice layer by utilizing coupling information with the help of a OpenFoam multiphase solver. The method can effectively simulate the effect of carbon fiber heating on the snow melting and ice melting of the asphalt concrete pavement, and can be used for researching the carbon fiber heating efficiency and the pavement ice layer melting process.

Inventors

• LIU YIMING
• YANG LIU
• GAO XIANG
• CAI FAN
• LIU LI
• Dou Huiru
• YU HAIBING
• YU HANLONG
• MA QIANG
• XIAO HENGLIN
• CHEN ZHI
• LI LIHUA
• LI WENTAO
• ZHOU XINLONG
• PEI YAOYAO

Assignees

• 湖北工业大学

Dates

Publication Date

20260505

Application Date

20220805

Claims (3)

1. 1. The method for simulating the discrete element numerical value of the snow melting and ice melting of the asphalt concrete pavement is characterized by comprising the following steps of: Step 1, establishing a two-dimensional discrete element sample model of an asphalt concrete pavement and an ice surface and giving mechanical parameters, wherein the two-dimensional discrete element sample model comprises a geometric model and a contact model, the geometric model comprises a concrete particle layer, an asphalt particle layer and an ice particle layer which are sequentially arranged from bottom to top, the contact model comprises bonding between adjacent particles, carbon fiber particles are arranged in the concrete particle layer to simulate carbon fiber heating, and the ice layer melting process is simulated by changing the mass of the ice particles in the ice particle layer; step 2, setting a heat transfer model for each particle of the two-dimensional discrete element sample model, and then setting a heating temperature for carbon fiber particles to simulate a melting process; step 3, automatically calculating the surface temperature of the ice particles at intervals in the temperature transmission process, so as to calculate the mass loss of the ice particles, the new particle size and the generated liquid amount; step 4, transmitting data such as the melting rate of the ice layer and the liquid quantity generated after the ice particles are melted to a CFD unit, and then calculating a temperature field in the ice layer by the CFD unit under the help of a OpenFoam multiphase solver developed by using coupling information, and updating the surface temperature of the ice particles; step 5, completing one-time numerical simulation of snow melting and ice melting after the ice layer is completely melted; in step 3, the ice particle mass loss calculation method is as follows: In the above-mentioned method, the step of, As a mass loss upon melting of the ice particles, In order to achieve the ice particle density, Is the latent heat of the ice particles, Is the surface temperature of the ice particles, Is the ice particle melting temperature, here 0C, To start the post-melting time variable.
2. 2. The method for simulating the numerical discrete elements of snow and ice melting on an asphalt concrete pavement according to claim 1, wherein the contact model comprises concrete-concrete bonding, asphalt-asphalt bonding, concrete-asphalt bonding, asphalt-ice bonding and ice-ice bonding.
3. 3. The method for simulating the ice and snow melting discrete element values of the asphalt concrete pavement according to claim 1 is characterized in that in step 1, PFC2D particle flow calculation software is adopted to build a two-dimensional discrete element sample model of the asphalt concrete pavement and the ice.

Description

Asphalt concrete pavement snow-melting and ice-melting discrete element numerical simulation method Technical Field The invention belongs to the technical field of civil construction, relates to a road surface snow melting and deicing technology, and particularly relates to a discrete element numerical simulation method for snow melting and deicing of an asphalt concrete pavement. Background The road surface condition is an important factor influencing road traffic, and in winter, the road snow or ice obviously affects the traffic, and important traffic hidden trouble exists while the national economy and the people life are greatly affected. The method for melting snow and ice by salt spraying which is widely adopted at present seriously affects the durability of concrete and causes damage to road facilities, so that the pursuit of a novel method for melting snow and ice has very important practical significance. The conductive heating of the carbon fiber becomes an effective method for melting snow and ice. With the rapid development of computer technology, the human computing power is greatly improved, and numerical simulation gradually becomes an important means for human to recognize natural laws, however, at present, a large number of finite element methods or finite difference methods are difficult to truly reflect the interaction between the refined ice particle unit melting process and the liquid temperature field generated after the ice layer melting and ice particles in the simulation process. The numerical simulation method coupled by CFD-DEM has natural advantages in simulating discrete units and particle-fluid interactions compared to the finite element and finite difference methods. However, the application of the carbon fiber composite material in the field of snow melting and ice melting of conductive heating of pavement carbon fibers has not been reported yet. Disclosure of Invention The invention aims to provide a method for simulating the snow melting and ice melting discrete element values of an asphalt concrete pavement, which simplifies the asphalt concrete pavement into concrete particles, asphalt particles, ice particles, concrete-concrete bonding, concrete-asphalt bonding, asphalt-asphalt bonding, ice-ice bonding and ice-asphalt bonding under the low temperature condition. And heating the concrete roadbed through the particle simulation carbon fiber, and simulating the pavement ice layer melting process by utilizing CFD-DEM coupling. So that the method is simple to operate, reliable in result and capable of effectively simulating the snow and ice melting process of the road surface. The technical scheme adopted for realizing the purpose of the invention is as follows: the method for simulating the discrete element numerical value of the snow melting and ice melting of the asphalt concrete pavement is characterized by comprising the following steps of: Step 1, establishing a two-dimensional discrete element sample model of an asphalt concrete pavement and an ice surface and giving mechanical parameters, wherein the two-dimensional discrete element sample model comprises a geometric model and a contact model, the geometric model comprises a concrete particle layer, an asphalt particle layer and an ice particle layer which are sequentially arranged from bottom to top, the contact model comprises bonding between adjacent particles, carbon fiber particles are arranged in the concrete particle layer to simulate carbon fiber heating, and the ice layer melting process is simulated by changing the mass of the ice particles in the ice particle layer; step 2, setting a heat transfer model for each particle of the two-dimensional discrete element sample model, and then setting a heating temperature for carbon fiber particles to simulate a melting process; step 3, automatically calculating the surface temperature of the ice particles at intervals in the temperature transmission process, so as to calculate the mass loss of the ice particles, the new particle size and the generated liquid amount; step 4, transmitting data such as the melting rate of the ice layer and the liquid quantity generated after the ice particles are melted to a CFD unit, and then calculating a temperature field in the ice layer by the CFD unit under the help of a OpenFoam multiphase solver developed by using coupling information, and updating the surface temperature of the ice particles; and 5, completing one-time numerical simulation of snow melting and ice melting after the ice layer is completely melted. The road bed is simulated by utilizing a concrete particle layer composed of concrete particles, a road surface is simulated by utilizing an asphalt particle layer composed of asphalt particles, an ice particle layer composed of ice particles is simulated by utilizing an ice particle layer composed of ice particles, the concrete-concrete bonding is bonding among the concrete particles, the asphalt-asphalt bonding is bo