CN-122021147-A - Bituminous pavement mechanical response analysis method and related device

CN122021147ACN 122021147 ACN122021147 ACN 122021147ACN-122021147-A

Abstract

The invention discloses a method for analyzing mechanical response of an asphalt pavement and a related device, wherein the method comprises the steps of acquiring non-uniform contact stress field data of a tire and the pavement based on a sensor, and constructing a viscoelastic model of the asphalt pavement; the method comprises the steps of constructing an asphalt pavement finite element model, utilizing a dynamic node detection algorithm to apply non-uniform contact stress field data of tires and pavement to matched finite element nodes to form a tire-sensor-pavement coupling model, and carrying out response simulation under rolling tire load based on the tire-sensor-pavement coupling model and a viscoelastic model of an asphalt pavement, analyzing response rules under different working conditions and carrying out asphalt pavement design and disease prediction. The invention can accurately represent the non-uniform contact stress characteristic of the tire, accurately reproduce the temperature-frequency dependence characteristic of the asphalt mixture and finish the dynamic response simulation of the asphalt pavement under the action of the real rolling tire load.

Inventors

GE HAITAO
CUI YUYANG
CHENG WEI
WU YI
LI SHUAISHUAI

Assignees

长安大学

Dates

Publication Date: 20260512
Application Date: 20260123

Claims (10)

1. The method for analyzing the mechanical response of the asphalt pavement is characterized by comprising the following steps of: Acquiring non-uniform contact stress field data of a tire and a pavement based on a sensor, and constructing a viscoelastic model of the asphalt pavement; constructing an asphalt pavement finite element model, and applying the non-uniform contact stress field data of the tire and the pavement to the matched finite element nodes by using a dynamic node detection algorithm to form a tire-sensor-pavement coupling model; Based on the tire-sensor-pavement coupling model and the asphalt pavement viscoelasticity model, response simulation under rolling tire load is carried out, response rules under different working conditions are analyzed, and asphalt pavement design and disease prediction are carried out.
2. The method for analyzing the mechanical response of the asphalt pavement according to claim 1, wherein the method for acquiring the data of the non-uniform contact stress field of the tire and the pavement comprises the following steps: Measuring the tire load based on the characteristic of the resistance changing with the applied stress by using a pressure sensor; And (3) adopting a heavy-duty tire, setting different inflation pressures and axle loads, and acquiring non-uniform contact stress field data of the tire and the road surface.
3. The method for analyzing mechanical response of an asphalt pavement according to claim 1, wherein the method for constructing a viscoelastic model of the asphalt pavement comprises the steps of: Obtaining dynamic modulus and phase angle of the asphalt mixture at a certain temperature and frequency, and fitting a viscoelastic parameter by adopting a finite element model and combining a time-temperature superposition principle and a reference temperature; And (3) comparing test results with simulation results by dividing test piece grids and carrying out numerical simulation, and verifying the reliability of the asphalt pavement viscoelasticity model.
4. The method for analyzing mechanical response of asphalt pavement according to claim 1, wherein the method for constructing the tire-sensor-pavement coupling model comprises the steps of: dividing grids by using an asphalt pavement finite element model, screening nodes on the surface of the asphalt pavement by using a dynamic node detection algorithm, and converting actual measurement stress of a sensor into node force; Based on the rolling speed of the tire, the stress field coordinates and the road surface node coordinates are matched in real time, and the node force is dynamically applied, so that a coupling chain of actual measurement stress, node force mapping and finite element loading is formed.
5. The method for analyzing mechanical response of asphalt pavement according to claim 4, wherein the method for calculating the node force comprises the following steps: In the formula, For the area of the sensor unit it is, For the stress of each cell in the sensor array, The sensor cells are numbered row and column, respectively.
6. The method for analyzing mechanical response of asphalt pavement according to claim 1, wherein the process for simulating the response under the load of the rolling tire comprises the steps of: Determining equivalent loading frequency according to the rolling speed of the tire, and matching the viscoelastic model parameters of the asphalt mixture; based on finite element simulation, applying non-uniform rolling load through a coupling chain, and simulating the surface deflection of the pavement; and comparing the surface deflection of the road surface subjected to numerical simulation with actually measured rut data, and quantifying the matching degree by adopting a shape consistency coefficient.
7. The method for analyzing mechanical response of asphalt pavement according to claim 6, wherein the method for quantifying matching degree by using shape consistency coefficient is as follows: In the formula, In order to simulate the vertical displacement of the device, In order to measure the depth of the rut, To simulate the mean value of the vertical displacement, The average value of the actually measured rut depth is obtained, and m is the number of measuring points.
8. An asphalt pavement mechanical response analysis system, comprising: The acquisition module is used for acquiring non-uniform contact stress field data of the tire and the pavement based on the sensor and constructing a viscoelastic model of the asphalt pavement; The modeling module is used for constructing an asphalt pavement finite element model, and applying the data of the non-uniform contact stress field of the tire and the pavement to the matched finite element nodes by utilizing a dynamic node detection algorithm to form a tire-sensor-pavement coupling model; The simulation module is used for performing response simulation under the load of the rolling tire based on the tire-sensor-pavement coupling model and the viscoelasticity model of the asphalt pavement, analyzing response rules under different working conditions and performing asphalt pavement design and disease prediction.
9. A terminal device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, characterized in that the processor implements the steps of the method according to any one of claims 1-7 when the computer program is executed by the processor.
10. A computer readable storage medium storing a computer program, characterized in that the computer program when executed by a processor implements the steps of the method according to any one of claims 1 to 7.

Description

Bituminous pavement mechanical response analysis method and related device Technical Field The invention belongs to the field of mechanical analysis and structural design of asphalt pavements, and relates to a mechanical response analysis method and a related device of an asphalt pavement. Background The dynamic response of asphalt pavement under the load of rolling tires is a core factor for determining the service life of asphalt pavement. The existing asphalt pavement design and analysis technology has the following key problems: The traditional load assumption has large deviation from the actual state, and the standard method is based on the elastic lamellar system theory, and the contact area of the tire and the road surface is assumed to be circular, the contact pressure is uniform and equal to the inflation pressure of the tire. However, the actual contact stress of the heavy-duty tire is unevenly distributed, and the distribution is obviously affected by the load and the inflation pressure of the tire, so that the conventional method is difficult to accurately predict the surface deterioration and the near-surface damage of the pavement. The non-uniform tire load is difficult to integrate into a numerical model, and the existing contact stress measurement technology of the tire and the road surface can obtain real stress distribution, but has the problem of 'measurement-modeling' dislocation. The actual measurement stress is difficult to be efficiently converted into the load input of the numerical model, so that the calculation result of the road surface mechanical response and the actual deviation are larger. The viscoelasticity characterization of the asphalt mixture is inaccurate, the asphalt mixture is a temperature-frequency dependent viscoelasticity material, an elastic model adopted by a standard method is difficult to simultaneously consider the mechanical behavior of the material under the coupling action of temperature and frequency, and the matching property of model parameters and actual load working conditions is insufficient, so that the dynamic response result and the actual deviation are large. The coupling simulation efficiency and the accuracy are unbalanced, namely the conventional tire-pavement coupling model simplifies the geometric characteristics of the tire, so that the details of the contact stress of the simulation result are lost, or the simulation efficiency is low due to the complexity of a contact detection algorithm, so that the dual requirements of engineering design on accuracy and high efficiency are difficult to meet. In order to solve the above problems, a method for integrating the real non-uniform tire load, accurately representing the viscoelastic characteristics of the asphalt mixture and efficiently realizing the coupling simulation of the tire-pavement interaction is needed to disclose the degradation mechanism of the asphalt pavement under the rolling tire load and guide the pavement optimization design. Disclosure of Invention The invention aims to provide an analysis method and a related device for mechanical response of an asphalt pavement, which solve the problems that in the structural analysis of the existing asphalt pavement, the tire load assumption is disconnected with the actual, the actual contact stress is difficult to integrate into a numerical model, the viscoelasticity characterization of an asphalt mixture is inaccurate, and the coupling simulation efficiency is low. In order to achieve the purpose, the invention is realized by adopting the following technical scheme: a method for analyzing mechanical response of an asphalt pavement, comprising: Acquiring non-uniform contact stress field data of a tire and a pavement based on a sensor, and constructing a viscoelastic model of the asphalt pavement; constructing an asphalt pavement finite element model, and applying the non-uniform contact stress field data of the tire and the pavement to the matched finite element nodes by using a dynamic node detection algorithm to form a tire-sensor-pavement coupling model; Based on the tire-sensor-pavement coupling model and the asphalt pavement viscoelasticity model, response simulation under rolling tire load is carried out, response rules under different working conditions are analyzed, and asphalt pavement design and disease prediction are carried out. Further, the method for acquiring the non-uniform contact stress field data of the tire and the pavement comprises the following steps: Measuring the tire load based on the characteristic of the resistance changing with the applied stress by using a pressure sensor; And (3) adopting a heavy-duty tire, setting different inflation pressures and axle loads, and acquiring non-uniform contact stress field data of the tire and the road surface. Further, the construction method of the asphalt pavement viscoelasticity model comprises the following steps: Obtaining dynamic modulus and phase angle of the asphalt