Evaluation method for rutting resistance of asphalt mixture and computer equipment

Abstract

The invention discloses a method for evaluating the rutting resistance of an asphalt mixture and computer equipment, and relates to the technical field of pavement engineering.The method comprises the steps that an asphalt mixture test piece is cut to form asphalt mixture sheets; respectively carrying out a rut test on each asphalt mixture sheet; acquiring slice images of the asphalt mixture slices in each rolling stage in the rut test process; calculating spatial motion parameters of the coarse aggregate according to the slice image, wherein the spatial motion parameters comprise translation displacement and a mass center rotation angle; and evaluating the anti-rutting performance of the asphalt mixture test piece according to the spatial motion parameters. By adopting the method, the anti-rutting performance of the asphalt mixture can be accurately evaluated, the method is simple, rapid, visual and convenient, the overall accuracy is high, and the gradation design and material composition of the asphalt mixture can be guided.

Description

Technical Field

[0001] The invention relates to the technical field of pavement engineering, and in particular to an evaluation method and computer equipment for the anti-rutting performance of asphalt mixture. Background Art

[0002] Under high temperature conditions, the shear stress generated by asphalt pavement due to the repeated action of vehicle loads may exceed the shear strength of the asphalt mixture, causing the flow deformation of the asphalt pavement to accumulate and form rutting damage.

[0003] Asphalt mixture is a multiphase composite material, consisting of coarse and fine aggregates of different particle sizes, asphalt mortar and voids, of which aggregates account for more than 95% of the total mass of the mixture. As a typical granular material system, the anti-rutting performance of asphalt mixture is closely related to parameters such as aggregate morphology, characteristics and gradation, and the rutting disease of asphalt pavement is mainly caused by the flow deformation of aggregate particles.

[0004] At present, the anti-rutting performance of asphalt mixture is mainly evaluated from a macroscopic perspective, but the existing evaluation methods are relatively simple and rough, and there are certain differences in the evaluation results, which makes it impossible to objectively and accurately evaluate the anti-rutting performance of asphalt mixture.

[0005] Therefore, in order to intuitively, conveniently and accurately evaluate the anti-rutting performance of asphalt mixtures, it is urgent to develop a method that can evaluate the anti-rutting performance of asphalt mixtures from microscopic indicators. Summary of the invention

[0006] The technical problem to be solved by the present invention is to provide an evaluation method and computer equipment for the anti-rutting performance of asphalt mixture, which can accurately evaluate the anti-rutting performance of asphalt mixture.

[0007] In order to solve the above technical problems, the present invention provides a method for evaluating the anti-rutting performance of asphalt mixture, comprising: cutting an asphalt mixture specimen to form asphalt mixture slices; performing a rutting test on each asphalt mixture slice respectively; collecting slice images of the asphalt mixture slices at each rolling stage during the rutting test; calculating spatial motion parameters of coarse aggregate based on the slice images, the spatial motion parameters including translational displacement and center of mass rotation angle; and evaluating the anti-rutting performance of the asphalt mixture specimen based on the spatial motion parameters.

[0008] As an improvement of the above scheme, the step of calculating the spatial motion parameters of coarse aggregate based on the slice image includes: obtaining slice images before and after rolling; binarizing the slice images to form a binary image; extracting coarse aggregate from the binary image; respectively obtaining the center of mass coordinates and principal axis direction of each coarse aggregate before and after rolling; calculating the translational displacement of each coarse aggregate based on the center of mass coordinates of each coarse aggregate before and after rolling; and calculating the center of mass rotation angle of each coarse aggregate based on the principal axis direction of each coarse aggregate before and after rolling.

[0009] As an improvement of the above scheme, the step of extracting coarse aggregate from the binary image includes: removing fine aggregate in the binary image; separating adhered particles in the binary image after removing the fine aggregate; and performing edge detection processing on the binary image after separating the adhered particles to obtain the contour line of the coarse aggregate.

[0010] As an improvement of the above scheme, the step of calculating the translation displacement of each coarse aggregate according to the centroid coordinates of each coarse aggregate before and after rolling includes: according to the formula , calculate the translational displacement of each coarse aggregate; where, x 1 is the horizontal coordinate of the coarse aggregate before rolling, x 2 is the horizontal coordinate of the coarse aggregate after rolling, y 1 is the ordinate of the coarse aggregate before rolling, y 2 is the ordinate of the coarse aggregate after rolling, L is the translational displacement.

[0011] As an improvement of the above scheme, the step of calculating the centroid angle of each coarse aggregate according to the main axis direction of each coarse aggregate before and after rolling includes: according to the formula Δ α=α 2- α 1. Calculate the centroid rotation angle of each coarse aggregate; where Δ α is the centroid angle, α 1 is the angle between the maximum principal axis and the horizontal axis of the coarse aggregate before rolling, α 2 is the angle between the maximum principal axis of the coarse aggregate after rolling and the horizontal axis. The maximum principal axis is the line between the two points with the largest distance on the convex boundary of the coarse aggregate.

[0012] As an improvement of the above-mentioned scheme, the step of evaluating the anti-rutting performance of the asphalt mixture specimen according to the spatial motion parameters includes: calculating the average value of the translational displacement of all coarse aggregates in the asphalt mixture specimen as a benchmark translational displacement; calculating the average value of the center of mass rotation angle of all coarse aggregates in the asphalt mixture specimen as a benchmark center of mass rotation angle; evaluating the anti-rutting performance of the asphalt mixture specimen according to the benchmark translational displacement and the benchmark center of mass rotation angle, wherein, the smaller the benchmark translational displacement, the better the anti-rutting performance of the asphalt mixture specimen, and the smaller the benchmark center of mass rotation angle, the better the anti-rutting performance of the asphalt mixture specimen.

[0013] As an improvement of the above scheme, the step of evaluating the anti-rutting performance of the asphalt mixture specimen according to the reference translation displacement and the reference center of mass rotation angle includes: extracting evaluation index scores according to the values ​​of the reference translation displacement and the reference center of mass rotation angle respectively; calculating the total score of the evaluation index according to the sum of the evaluation index scores; and evaluating the anti-rutting performance of the asphalt mixture specimen according to the total score of the evaluation index. As an improvement of the above scheme, the evaluation method for the anti-rutting performance of the asphalt mixture also includes: constructing a coarse aggregate microscopic motion structure model of the asphalt mixture specimen under vehicle load according to the spatial motion parameters.

[0014] As an improvement of the above-mentioned scheme, the step of constructing a coarse aggregate micro-motion structure model of the asphalt mixture specimen under the action of vehicle load based on the spatial motion parameters includes: connecting the centroid coordinates of each coarse aggregate before rolling with the centroid coordinates after rolling through straight lines; setting arrows for the straight lines to construct the spatial displacement vector of the coarse aggregate, the direction of the arrow is from the centroid coordinate before rolling to the centroid coordinate after rolling, and the spatial displacement vector includes the movement direction, displacement magnitude and principal axis change of the coarse aggregate.

[0015] Correspondingly, the present invention also provides a computer device, including a memory and a processor, wherein the memory stores a computer program, wherein the processor implements the steps of the above-mentioned method for evaluating the anti-rutting performance of asphalt mixture when executing the computer program.

[0016] The implementation of the present invention has the following beneficial effects: The present invention can evaluate the anti-rutting performance of asphalt mixture by obtaining slice images of asphalt mixture and using the spatial motion parameters of coarse aggregate based on the particle material theory. The method is simple, fast, intuitive, convenient and has high overall accuracy, and can guide the gradation design and material composition of asphalt mixture. Furthermore, the present invention can well reflect the movement characteristics of coarse aggregate of asphalt mixture under vehicle load from a mesoscopic dimension by constructing a mesoscopic movement structure model of coarse aggregate. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a flow chart of a first embodiment of a method for evaluating the anti-rutting performance of asphalt mixtures according to the present invention; Figure 2 It is a schematic diagram of rolling and cutting of an asphalt mixture specimen in the present invention; Figure 3 It is a schematic diagram of shooting a slice image in the present invention; Figure 4 is a schematic diagram of the changes of the coarse aggregate before and after rolling in the present invention; Figure 5 is a flow chart of a second embodiment of the method for evaluating the anti-rutting performance of asphalt mixture of the present invention; Figure 6 Schematic diagram of the coarse aggregate mesoscopic motion structure model of the SBS modified asphalt in the present invention; Figure 7 It is a schematic diagram of the mesoscopic motion structure model of the coarse aggregate of the rock asphalt in the present invention. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings. It is hereby stated that the directional terms such as up, down, left, right, front, back, inside, outside, etc. that appear or will appear in the text of the present invention are only based on the accompanying drawings of the present invention, and are not specific limitations of the present invention.

[0019] See also Figure 1 , Figure 1 The flowchart of the first embodiment of the method for evaluating the anti-rutting performance of asphalt mixture of the present invention is shown, comprising: S101, cutting the asphalt mixture specimen to form asphalt mixture sheets; In practical applications, asphalt mixture specimens can be formed by wheel rolling, and then the asphalt mixture specimens can be cut to form asphalt mixture sheets.

[0020] For example, in accordance with the "Test Procedures for Asphalt and Asphalt Mixtures in Highway Engineering" T0703-2011, according to the preset grading and asphalt type, a wheel roller can be used to form an asphalt mixture specimen (i.e., rutting plate) with a size of 30cm×30cm×5cm; when rolling, first roll it in one direction for 2 back and forth (4 times), then turn the rutting plate in the opposite direction and roll it 12 back and forth (24 times), and demold it 12 hours after forming to form an asphalt mixture specimen.

[0021] like Figure 2As shown, when the asphalt mixture specimen is cut, an automatic asphalt mixture cutting and grinding machine is used to cut the asphalt mixture specimen at equal distances along the vertical direction of the wheel rolling, so as to divide the asphalt mixture specimen into multiple asphalt mixture sheets; preferably, the asphalt mixture specimen can be divided into 3 parts, that is, 3 asphalt mixture sheets are formed, and the cutting interval is 10 cm, but this is not limited to it.

[0022] S102, performing a rutting test on each asphalt mixture sheet; S103, collecting slice images of the asphalt mixture slices at each rolling stage during the rutting test; In practical applications, a high-definition digital camera can be used to capture slice images of asphalt mixture slices at each rolling stage during the rutting test. The specific steps include: (1) If Figure 3 As shown, the cut asphalt mixture pieces 1 are placed on the platform 2 respectively, and a high-definition digital camera is supported by a reinforced triangular bracket to shoot the cross section of the asphalt mixture piece before the rutting test (i.e. before rolling); During the shooting process, the cross section of the asphalt mixture sheet is parallel to the lens of the high-definition digital camera; the shooting distance is preferably 50 cm, but not limited thereto.

[0023] For example, when the asphalt mixture specimen is equally divided into three asphalt mixture slices, a total of four slice images are obtained for each asphalt mixture specimen; (2) Place the cut asphalt mixture slices on an automatic rutting test machine for rutting tests; like Figure 2 As shown, the rutting test temperature is preferably 60±0.5°C, the wheel pressure is preferably 0.7MPa, and the wheel rolling direction is perpendicular to the cutting direction.

[0024] (3) The asphalt mixture sheet after the rutting test is placed on the platform again, and a high-definition digital camera is supported by a reinforced triangular bracket to shoot the cross-section of the asphalt mixture sheet after the rutting test (i.e., after rolling).

[0025] In order to further improve the prediction performance, multiple asphalt mixture specimens can be formed simultaneously using the same grading, asphalt type and method, and the same cutting method can be used to cut them to form multiple asphalt mixture slices, and the same shooting method can be used to obtain multiple slice images.

[0026] For example, when three asphalt mixture specimens are formed at the same time, nine asphalt mixture slices and 12 slice images can be formed.

[0027] S104, calculating the spatial motion parameters of the coarse aggregate according to the slice image; It should be noted that the spatial motion parameters include translation displacement and centroid rotation angle; accordingly, the steps of calculating the spatial motion parameters of the coarse aggregate according to the slice image include: (1) Obtain slice images before and after rolling; (2) Binarizing the slice image to form a binary image; Specifically, the slice image can be converted into a grayscale image first, and then the noise of the grayscale image can be removed by using the Gaussian algorithm, and then the contrast of the grayscale image can be enhanced, and finally the enhanced grayscale image can be binarized by using the maximum inter-class variance method (Otsu's).

[0028] (3) Extracting coarse aggregate from the binary image; Further, the step of extracting coarse aggregate from the binary image includes: (3.1) Remove fine aggregates from the binary image; (3.2) Separated adherent particles in the binarized image after removing fine aggregate; The adherent particles of the binary image after removing fine aggregates can be separated with the help of watershed algorithm.

[0029] (3.3) Perform edge detection on the binary image after separation of the adhering particles to obtain the contour of the coarse aggregate.

[0030] (4) Obtain the centroid coordinates and principal axis directions of each coarse aggregate before and after rolling; (5) Calculate the translational displacement of each coarse aggregate based on the centroid coordinates of each coarse aggregate before and after rolling; Accordingly, the translation displacement of each coarse aggregate is calculated according to the following formula: L :

[0031] in, The coordinates of the centroid of the coarse aggregate before rolling are ( x 1, y 1), x 1 is the horizontal coordinate of the coarse aggregate before rolling, y 1 is the ordinate of the coarse aggregate before rolling; The coordinates of the centroid of the coarse aggregate after rolling are ( x 2, y 2), x 2 is the horizontal coordinate of the coarse aggregate after rolling, y 2 is the vertical coordinate of the coarse aggregate after rolling.

[0032] (6) Calculate the centroid rotation angle of each coarse aggregate based on the main axis direction of each coarse aggregate before and after rolling.

[0033] Accordingly, the centroid angle Δ of each coarse aggregate is calculated according to the following formula: α : Δ α=α 2- α 1 in, Δ α is the angle of rotation of the coarse aggregate along the centroid, i.e., the centroid rotation angle (see Figure 4 ); α 1 is the maximum principal axis of the coarse aggregate before rolling The angle with the horizontal axis, and 0< α 1<π / 2 (see Figure 4 ); α 2 is the maximum principal axis of the coarse aggregate after rolling The angle with the horizontal axis, and 0< α 2<π / 2 (see Figure 4 ); The maximum principal axis is the line between the two points with the largest distance on the convex boundary of the coarse aggregate.

[0034] S105, evaluating the anti-rutting performance of the asphalt mixture specimen according to the spatial motion parameters.

[0035] Accordingly, the steps of evaluating the anti-rutting performance of the asphalt mixture specimen according to the spatial motion parameters include: (1) Calculate the average translational displacement of all coarse aggregates in the asphalt mixture specimen as the reference translational displacement; (2) Calculate the average value of the centroid rotation angle of all coarse aggregates in the asphalt mixture specimen as the reference centroid rotation angle; For example, when three asphalt mixture specimens are formed at the same time, nine asphalt mixture slices and 12 slice images can be formed. At this time, the translation displacement of all coarse aggregates in the 12 slice images can be calculated to form the reference translation displacement; similarly, the centroid rotation angle of all coarse aggregates in the 12 slice images can be calculated to form the reference centroid rotation angle.

[0036] (3) The smaller the reference translation displacement, the better the anti-rutting performance of the asphalt mixture specimen; (4) The smaller the reference centroid angle, the better the anti-rutting performance of the asphalt mixture specimen.

[0037] Furthermore, according to the reference translation displacement and reference centroid rotation angle The rutting resistance of asphalt mixture specimens is graded and evaluated within the scope of the test. The specific steps include: (1) Extracting evaluation index scores according to the values ​​of the reference translation displacement and the reference center of mass rotation angle; For example, When 0≤ <1.5or0≤ When the angle is less than 4°, the evaluation index score P is recorded as 5 points; When 1.5< ≤2 or 4°< When ≤5°, the evaluation index score P is recorded as 4 points; When 2< ≤2.5 or 5°< When ≤6°, the evaluation index score P is recorded as 3 points; When 2.5< ≤3 or 6°< When ≤7°, the evaluation index score P is recorded as 2 points; when >3 or When the angle is greater than 7°, the evaluation index score P is recorded as 1 point.

[0038] (2) Calculating the total score of the evaluation index based on the sum of the scores of the evaluation indexes; (3) Evaluate the anti-rutting performance of the asphalt mixture specimen according to the total score of the evaluation index.

[0039] When the total score of the evaluation index is 9≤ΣP≤10, the anti-rutting performance of the asphalt mixture specimen is “excellent”; When the total score of the evaluation index is 8≤ΣP<9, the anti-rutting performance of the asphalt mixture specimen is “good”; When the total score of the evaluation index is 6≤ΣP<8, the anti-rutting performance of the asphalt mixture specimen is “medium”; When the total score of the evaluation index is 4≤ΣP<6, the anti-rutting performance of the asphalt mixture specimen is “poor”; When the total score of the evaluation index 2≤ΣP<4, the anti-rutting performance of the asphalt mixture specimen is “poor”; That is, the evaluation criteria for the spatial motion parameters of coarse aggregate are as described in Table 1: Table 1

[0040] Furthermore, asphalt mixture specimens with anti-rutting performance of "excellent" or "good" can be regarded as qualified asphalt mixture.

[0041] The evaluation results of asphalt mixture are verified in combination with specific examples below: Step 1: 70# asphalt, SBS modified asphalt and rock asphalt were selected for research. The performance indicators of each asphalt are shown in Tables 2 to 4 below. Table 2 is the technical indicators of 70# asphalt and SBS modified asphalt, Table 3 is the technical indicators of rock asphalt, and Table 4 is the volume indicators of 70# asphalt, SBS modified asphalt and rock asphalt: Table 2

[0042] Table 3

[0043] Table 4

[0044] Step 2: According to the above steps S101 to S105, the spatial motion parameters of the slice images of 70# asphalt, SBS modified asphalt and rock asphalt are statistically analyzed respectively, and the following can be obtained: For 70# asphalt: =2.59mm, = 6.78°, anti-rutting performance is "fair"; For SBS modified asphalt: =1.34mm, = 3.87°, anti-rutting performance is "excellent"; For Rock Asphalt: =1.83mm, = 4.62°, and the anti-rutting performance is “good”.

[0045] Step 3: According to the "Highway Engineering Asphalt and Asphalt Mixture Test Procedure" T0719-2011, standard rutting tests were conducted on 70# asphalt, SBS modified asphalt and rock asphalt respectively. The test temperature was 60±0.5℃, the wheel pressure was 0.7MPa, and the test was rolled for one hour. The dynamic stability (DS) index for evaluating the anti-rutting performance of asphalt mixture was obtained as follows: For 70# asphalt: DS=3417 times / mm; For SBS modified asphalt: DS = 7631 times / mm; For rock asphalt: DS = 5314 times / mm.

[0046] Therefore, the anti-rutting performance of 70# asphalt is worse than that of rock asphalt, while the anti-rutting performance of SBS modified asphalt is significantly better than that of rock asphalt.

[0047] It can be seen from the above that the anti-rutting performance evaluation result obtained by adopting the present invention is consistent with the standard rutting test result, that is, the anti-rutting performance requirements of asphalt mixture can be accurately evaluated by adopting the present invention, and the operation is convenient and the accuracy is high.

[0048] See also Figure 5 , Figure 5 A flow chart of a second embodiment of the method for evaluating the anti-rutting performance of asphalt mixture of the present invention is shown, comprising: S201, cutting the asphalt mixture specimen to form asphalt mixture sheets; S202, performing a rutting test on each asphalt mixture sheet; S203, collecting slice images of the asphalt mixture slices at each rolling stage during the rutting test; S204, calculating the spatial motion parameters of the coarse aggregate according to the slice image, the spatial motion parameters including the translation displacement and the centroid rotation angle; S205, evaluating the anti-rutting performance of the asphalt mixture specimen according to the spatial motion parameters; S206, constructing a coarse aggregate microscopic motion structure model of the asphalt mixture specimen under vehicle load according to the spatial motion parameters.

[0049] and Figure 1 Different from the first embodiment shown, this embodiment can construct a coarse aggregate microscopic motion structure model of the asphalt mixture specimen under vehicle load according to the spatial motion parameters; the specific steps include: (1) Connect the centroid coordinates of each coarse aggregate before rolling with the centroid coordinates of each coarse aggregate after rolling by straight lines; (2) Set arrows for the straight lines to construct the spatial displacement vector of the coarse aggregate. The direction of the arrows is from the centroid coordinates before rolling to the centroid coordinates after rolling (see Figure 6 and Figure 7 ); The spatial displacement vector includes the movement direction of the coarse aggregate, the displacement magnitude and the principal axis change.

[0050] like Figure 6 and Figure 7 As shown, the microscopic movement is manifested as follows: the smaller the spatial displacement vector of the coarse aggregate under the vehicle load, the slower the spatial movement; and the macroscopic performance is manifested as: better anti-rutting performance.

[0051] Therefore, the present invention can obtain slice images of asphalt mixture through digital image processing technology, and based on the theory of granular materials, use the spatial motion parameters of coarse aggregate to evaluate the anti-rutting performance of asphalt mixture, which can well reflect the movement characteristics of coarse aggregate of asphalt mixture under vehicle load from a microscopic dimension.

[0052] Correspondingly, the present invention also provides a computer device, including a memory and a processor, wherein the memory stores a computer program, wherein the processor implements the steps of the above-mentioned method for evaluating the anti-rutting performance of asphalt mixture when executing the computer program.

[0053] In summary, the present invention can accurately evaluate the anti-rutting performance of asphalt mixtures, is simple and fast, intuitive and convenient, and has high overall accuracy, and can guide the grading design and material composition of asphalt mixtures.

[0054] The above is a preferred embodiment of the present invention. It should be pointed out that a person skilled in the art can make several improvements and modifications without departing from the principle of the present invention. These improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A method for evaluating the anti-rutting performance of asphalt mixture, characterized in that: include: Cutting the asphalt mixture specimen to form asphalt mixture sheets; Carry out rutting test on each asphalt mixture piece; Collect slice images of asphalt mixture slices at each rolling stage during the rutting test; Calculating spatial motion parameters of coarse aggregate according to the slice image, wherein the spatial motion parameters include translation displacement and centroid rotation angle; The anti-rutting performance of the asphalt mixture specimen is evaluated according to the spatial motion parameters.

2. The method for evaluating the anti-rutting performance of asphalt mixture according to claim 1, characterized in that: The step of calculating the spatial motion parameters of the coarse aggregate according to the slice image comprises: Obtain slice images before and after rolling; Performing binarization processing on the slice image to form a binarized image; extracting coarse aggregate from the binarized image; Obtain the centroid coordinates and principal axis directions of each coarse aggregate before and after rolling; The translation displacement of each coarse aggregate is calculated according to the centroid coordinates of each coarse aggregate before and after rolling; The centroid rotation angle of each coarse aggregate is calculated based on the main axis direction of each coarse aggregate before and after rolling.

3. The method for evaluating the anti-rutting performance of asphalt mixture according to claim 2, characterized in that: The step of extracting coarse aggregate from the binary image comprises: removing fine aggregate in the binary image; Separated adherent particles in the binarized image after fine aggregate removal; Edge detection is performed on the binary image after separation of the adhered particles to obtain the contour of the coarse aggregate.

4. The method for evaluating the anti-rutting performance of asphalt mixture according to claim 2, characterized in that: The step of calculating the translation displacement of each coarse aggregate according to the centroid coordinates of each coarse aggregate before and after rolling comprises: According to the formula , calculate the translational displacement of each coarse aggregate; in, x 1 is the horizontal coordinate of the coarse aggregate before rolling, x 2 is the horizontal coordinate of the coarse aggregate after rolling, y 1 is the ordinate of the coarse aggregate before rolling, y 2 is the ordinate of the coarse aggregate after rolling, L is the translational displacement.

5. The method for evaluating the anti-rutting performance of asphalt mixture according to claim 2, characterized in that: The step of calculating the centroid angle of each coarse aggregate according to the main axis direction of each coarse aggregate before and after rolling comprises: According to the formula Δ α=α 2- α 1. Calculate the centroid rotation angle of each coarse aggregate; Among them, Δ α is the centroid angle, α 1 is the angle between the maximum principal axis and the horizontal axis of the coarse aggregate before rolling, α 2 is the angle between the maximum principal axis of the coarse aggregate after rolling and the horizontal axis. The maximum principal axis is the line between the two points with the largest distance on the convex boundary of the coarse aggregate.

6. The method for evaluating the anti-rutting performance of asphalt mixture according to claim 1, characterized in that: The step of evaluating the anti-rutting performance of the asphalt mixture specimen according to the spatial motion parameter comprises: Calculating the average value of the translation displacement of all coarse aggregates in the asphalt mixture specimen as a reference translation displacement; Calculate the average value of the centroid rotation angles of all coarse aggregates in the asphalt mixture specimen as a reference centroid rotation angle; The anti-rutting performance of the asphalt mixture specimen is evaluated according to the reference translation displacement and the reference centroid rotation angle, wherein: The smaller the reference translation displacement is, the better the anti-rutting performance of the asphalt mixture specimen is. The smaller the reference centroid angle is, the better the anti-rutting performance of the asphalt mixture specimen is.

7. The method for evaluating the anti-rutting performance of asphalt mixture according to claim 6, characterized in that: The step of evaluating the anti-rutting performance of the asphalt mixture specimen according to the reference translation displacement and the reference centroid rotation angle comprises: Extracting evaluation index scores respectively according to the values ​​of the reference translation displacement and the reference centroid rotation angle; Calculate the total score of the evaluation index according to the sum of the scores of the evaluation index; The anti-rutting performance of the asphalt mixture specimen is evaluated according to the total score of the evaluation index.

8. The method for evaluating the anti-rutting performance of asphalt mixture according to claim 1, characterized in that: Also includes: According to the spatial motion parameters, a coarse aggregate mesoscopic motion structure model of the asphalt mixture specimen under vehicle load is constructed.

9. The method for evaluating the anti-rutting performance of asphalt mixture according to claim 8, characterized in that: The step of constructing a coarse aggregate mesoscopic motion structure model of the asphalt mixture specimen under vehicle load according to the spatial motion parameters comprises: Connect the centroid coordinates of each coarse aggregate before rolling with the centroid coordinates of each coarse aggregate after rolling through straight lines; Arrows are set for the straight lines to construct the spatial displacement vector of the coarse aggregate. The direction of the arrow points from the centroid coordinates before rolling to the centroid coordinates after rolling. The spatial displacement vector includes the movement direction, displacement magnitude and principal axis change of the coarse aggregate.

10. A computer device comprising a memory and a processor, wherein the memory stores a computer program, characterized in that: When the processor executes the computer program, the steps of the method according to any one of claims 1 to 9 are implemented.

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