Asphalt mixture permanent deformation evaluation method and system and storage medium

Abstract

The invention discloses an asphalt mixture permanent deformation evaluation method and system and a storage medium. The method comprises the following steps: obtaining rut test permanent deformation Rai of a target asphalt mixture corresponding to each layer of asphalt mixture unit according to a rut test; obtaining the interval value range of Tpef, Pi, Ne3 and R0i according to the permanent deformation calculation formula of each layer of asphalt mixture unit and the rut test permanent deformation Rai of each layer of asphalt mixture unit, and obtaining the interval value range of the permanent deformation Rai of each layer of asphalt mixture unit according to the permanent deformation calculation formula of each layer of asphalt mixture unit; the interval value range of the permanent deformation Rai of each layer of asphalt mixture unit is made to obtain a target asphalt mixture permanent deformation interval according to an asphalt mixture permanent deformation interval numerical calculation formula, and finally the deformation grade of the asphalt mixture is evaluated according to the target asphalt mixture permanent deformation interval. The method solves the problem that an existing asphalt mixture permanent deformation evaluation method is not accurate.

Description

Technical Field

[0001] The present invention relates to the technical field of asphalt mixtures, and in particular to an asphalt mixture permanent deformation assessment method, system and storage medium. Background Art

[0002] At present, asphalt pavement is the most commonly used pavement in road construction. With global warming, the temperature continues to rise, and the temperature of asphalt pavement also continues to rise. As a result, the bearing capacity of asphalt mixtures in the hot summer season is reduced. The road surface is very easy to produce permanent deformation under the repeated action of vehicle loads, forming rutting. In addition, the increasing traffic volume has caused serious rutting and other diseases, which seriously affect the performance of the road. The existing method for determining the deformation of asphalt pavement is to obtain asphalt rutting test data. However, asphalt rutting test data is probabilistically distributed and is inconsistent with the actual situation, resulting in inaccurate calculation results of permanent deformation.

[0003] The existing invention patent with the patent publication number CN102331249A discloses a method for evaluating the permanent deformation of an asphalt pavement, which divides the ambient temperature of the asphalt pavement into two or more intervals, divides the asphalt mixture layer into two or more sub-layers, calculates the deformation of each sub-layer under different temperature and load conditions, and evaluates the permanent deformation of the asphalt pavement according to the deformation and average deviatoric stress value of each sub-layer. Although it reasonably utilizes tools or means such as the superposition principle, mechanical analysis, and asphalt mixture deformation analysis, and fully considers the influence of factors such as vehicle load, pavement material characteristics, and temperature conditions on the permanent deformation of the asphalt pavement, so as to achieve timely evaluation of the permanent deformation of the asphalt pavement, it cannot actually reflect the actual permanent deformation of the asphalt pavement. Summary of the invention

[0004] The main purpose of the present invention is to provide a method, system and storage medium for evaluating permanent deformation of asphalt mixture, aiming to solve the technical problem that the existing method for evaluating permanent deformation of asphalt mixture is inaccurate.

[0005] To achieve the above object, the present invention provides a method for evaluating permanent deformation of asphalt mixture, the method comprising the following steps:

[0006] Step 1: According to the rutting test, the permanent deformation R of each layer of asphalt mixture unit corresponding to the target asphalt mixture is obtained. ai ;

[0007] Step 2: According to the calculation formula of the permanent deformation of each layer of asphalt mixture unit and the permanent deformation R of each layer of asphalt mixture unit in the rutting test ai Get the permanent deformation equivalent temperature T of each layer of asphalt mixture unit pef , vertical compressive stress P on the top surface of the i-th layer asphalt mixture uniti , the cumulative number of equivalent design axle load actions on the design lane N e3 , the permanent deformation R of the rutting test of the i-th layer asphalt mixture unit 0i The calculation formula of the permanent deformation of each layer of asphalt mixture unit is:

[0008] k Ri is the comprehensive correction factor;

[0009] Step 3: According to T pef , P i 、N e3 , R 0i The calculation formula of the permanent deformation of each layer of asphalt mixture unit is used to obtain the permanent deformation R of each layer of asphalt mixture unit. ai The range of interval values;

[0010] Step 4: The permanent deformation R of each layer of asphalt mixture unit in step 3 is ai The range of the interval is based on the numerical calculation formula of the permanent deformation interval of asphalt mixture to obtain the target asphalt mixture permanent deformation interval, where the numerical calculation formula of the permanent deformation interval of asphalt mixture is:

[0011]

[0012] Step 5: Evaluate the deformation grade of the asphalt mixture according to the target asphalt mixture permanent deformation range.

[0013] Optionally, in step 1, specifically:

[0014] According to the existing highway asphalt pavement design specifications, a standard rutting test is carried out to obtain the rutting test permanent deformation R of each layer of asphalt mixture unit corresponding to the target asphalt mixture. ai .

[0015] Optionally, step 2 specifically includes:

[0016] Step 21, according to the calculation formula of the permanent deformation of each layer of asphalt mixture unit and the rutting test permanent deformation R of each layer of asphalt mixture unit ai Get the test parameter T pef , P i 、N e3 , R 0i The standard deviation of

[0017] Step 22, obtain the test parameter T according to the formula x = [p-3θ, p+3θ] pef , P i 、N e3 , R 0iCorresponding interval value range, where p is the test parameter T pef , P i 、N e3 , R 0i The corresponding average value, θ is the test parameter T pef , P i 、N e3 , R 0i The corresponding standard deviation.

[0018] Optionally, in step 22, T pef The interval value range is

[0019] P i The interval value range is

[0020] N e3 The interval value range is

[0021] R 0i The interval value range is

[0022] in, T pef , P i 、N e3 , R 0i The average value of T pef , P i 、N e3 , R 0i The standard deviation of .

[0023] Optionally, step 3 is specifically:

[0024] Set T determined in step 22 pef , P i 、N e3 , R 0i The interval value range is based on R ai The upper and lower endpoints of the interval value are calculated by the formula to determine the permanent deformation R of each layered asphalt mixture unit. ai The value range of the interval.

[0025] Optionally, R ai The calculation formula for the lower endpoint value of the interval is:

[0026]

[0027] R ai The calculation formula for the upper endpoint value of the interval is:

[0028]

[0029] in,

[0030] Optionally, in step 1, the permanent deformation R of the target asphalt mixture a The permanent deformation R of each layer of asphalt mixture unit in the rutting test ai Satisfies the following formula:

[0031]

[0032] Where n is the total number of asphalt mixture units into which the target asphalt mixture is divided.

[0033] In addition, in order to achieve the above-mentioned objectives, the present invention also provides an asphalt mixture permanent deformation assessment system, which includes a memory, a processor, and an asphalt mixture permanent deformation assessment program stored in the memory and executable on the processor, and the asphalt mixture permanent deformation assessment program, when executed by the processor, implements the steps of the asphalt mixture permanent deformation assessment method as described in any of the above items.

[0034] In addition, in order to achieve the above-mentioned purpose, the present invention also provides a computer storage medium, on which a permanent deformation assessment program for an asphalt mixture is stored. When the permanent deformation assessment program for an asphalt mixture is executed by a processor, the steps of the permanent deformation assessment method for an asphalt mixture as described in any of the above items are implemented.

[0035] Beneficial effects:

[0036] The present invention obtains the rutting test permanent deformation R of each layer of asphalt mixture unit corresponding to the target asphalt mixture according to the rutting test. ai ; and according to the calculation formula of the permanent deformation of each layer of asphalt mixture unit and the permanent deformation of each layer of asphalt mixture unit in the rutting test R ai Get T pef , P i 、N e3 , R 0i The range of interval values; and according to T pef , P i 、N e3 , R 0i The calculation formula of the permanent deformation of each layer of asphalt mixture unit is used to obtain the permanent deformation R of each layer of asphalt mixture unit. ai The interval range of the asphalt mixture unit of each layer is aiThe range of values ​​of the interval is obtained according to the numerical calculation formula for the permanent deformation interval of asphalt mixture, and finally the deformation grade of asphalt mixture is evaluated according to the target permanent deformation interval of asphalt mixture. Therefore, this method for calculating the permanent deformation of asphalt mixture can not only ensure the accuracy of the numerical results of the solved permanent deformation interval of asphalt mixture, but also fully reflect the complexity of the permanent deformation of asphalt mixture, solve the problem that point variables cannot fully express the complexity of the permanent deformation parameters of asphalt mixture, and improve the breadth and applicability of the calculation formula for the permanent deformation of asphalt mixture. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 It is a schematic flow chart of a first embodiment of a method for evaluating permanent deformation of asphalt mixture according to the present invention.

[0038] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0039] It should be understood that the specific embodiments described herein are only used to explain the present invention, and are not used to limit the present invention.

[0040] like Figure 1 As shown, the present invention provides a method for evaluating permanent deformation of asphalt mixture, the method comprising the following steps:

[0041] Step 1: According to the rutting test, the permanent deformation R of each layer of asphalt mixture unit corresponding to the target asphalt mixture is obtained. ai Specifically, a standard rutting test is carried out according to the requirements of the Highway Asphalt Pavement Design Specification JTGD50-2017 to obtain the rutting test permanent deformation R of each layer of asphalt mixture unit corresponding to the target asphalt mixture. ai . And the permanent deformation R of the target asphalt mixture a The permanent deformation R of each layer of asphalt mixture unit in the rutting test ai Satisfies the following formula:

[0042] Where n is the total number of asphalt mixture units into which the target asphalt mixture is divided.

[0043] Step 2: According to the calculation formula of the permanent deformation of each layer of asphalt mixture unit and the permanent deformation R of each layer of asphalt mixture unit in the rutting test ai Get the permanent deformation equivalent temperature T of each layer of asphalt mixture unit pef , vertical compressive stress on the top surface of the i-th layer asphalt mixture unit (MPa) P i , the cumulative number of equivalent design axle load actions on the design lane N e3, the permanent deformation R of the rutting test of the i-th layer asphalt mixture unit 0i The range of values ​​is as follows: The permanent deformation of the rutting test R0i refers to the permanent deformation of the ith layer of asphalt mixture when the test temperature is 60°C, the pressure is 0.7MPa, and the number of loadings is 2520 times (mm). The thickness of the ith layer of asphalt mixture unit is h i , the thickness of the rutting test specimen is h0.

[0044] The calculation formula of the permanent deformation of each layer of asphalt mixture unit is:

[0045] k Ri is the comprehensive correction coefficient, and parameter T pef 、p i 、N e3 , R 0i >0, and T pef 、p i 、N e3 , R 0i It is a continuous multiplication operation, satisfying the expression f(x,y,z...)=x a y b z c ..., x, y, z...>0, a, b, c...>0. And for interval operations, the upper and lower endpoints of x, y, z..., a, b, c... can be used to calculate the interval number of f(x, y, z...), that is,

[0046]

[0047] Specifically, step 2 specifically includes:

[0048] Step 21, according to the calculation formula of the permanent deformation of each layer of asphalt mixture unit and the rutting test permanent deformation R of each layer of asphalt mixture unit ai Get the test parameter T pef , P i 、N e3 , R 0i The standard deviation of

[0049] Step 22, obtain the test parameter T according to the formula x = [p-3θ, p+3θ] pef , P i 、N e3 , R 0i Corresponding interval value range, where p is the test parameter T pef , P i 、N e3 , R 0i The corresponding average value, θ is the test parameter T pef , Pi 、N e3 , R 0i The corresponding standard deviation, and thus the interval value range of the above parameters are as follows:

[0050] T pef The interval value range is

[0051] P i The interval value range is

[0052] N e3 The interval value range is

[0053] R 0i The interval value range is

[0054] in, T pef , P i 、N e3 , R 0i The average value of T pef , P i 、N e3 , R 0i The standard deviation of .

[0055] Step 3: According to T pef , P i 、N e3 , R 0i The calculation formula of the permanent deformation of each layer of asphalt mixture unit is used to obtain the permanent deformation R of each layer of asphalt mixture unit. ai The interval value range is T pef , P i 、N e3 , R 0i Substitute the interval value range into R ai The upper and lower endpoints of the interval are calculated from the formula, and then the permanent deformation R of each layered asphalt mixture unit is obtained. ai The value range of the interval.

[0056] Among them, R ai The calculation formula for the lower endpoint value of the interval is:

[0057]

[0058] R ai The calculation formula for the upper endpoint value of the interval is:

[0059]

[0060] in,

[0061] Step 4: The permanent deformation R of each layer of asphalt mixture unit in step 3 is ai The range of the interval is based on the numerical calculation formula of the permanent deformation interval of asphalt mixture to obtain the target asphalt mixture permanent deformation interval, where the numerical calculation formula of the permanent deformation interval of asphalt mixture is:

[0062]

[0063] Then, the lower endpoint value of the interval number results of the permanent deformation of the asphalt mixture units from the first layer to the nth layer is accumulated respectively as the lower endpoint value of the interval value of the permanent deformation of the asphalt mixture, and the upper endpoint value of the interval number results of the permanent deformation of the asphalt mixture units from the first layer to the nth layer is accumulated as the upper endpoint value of the interval value of the permanent deformation of the asphalt mixture, wherein R ai , is the result calculated in step 4, that is

[0064]

[0065] Step 5: According to the target asphalt mixture permanent deformation range To evaluate the deformation grade of asphalt mixture.

[0066] The present invention obtains the rutting test permanent deformation R of each layer of asphalt mixture unit corresponding to the target asphalt mixture according to the rutting test. ai ; and according to the calculation formula of the permanent deformation of each layer of asphalt mixture unit and the permanent deformation of each layer of asphalt mixture unit in the rutting test R ai Get T pef , P i 、N e3 , R 0i The range of interval values; and according to T pef , P i 、N e3 , R 0i The calculation formula of the permanent deformation of each layer of asphalt mixture unit is used to obtain the permanent deformation R of each layer of asphalt mixture unit. ai The interval range of the asphalt mixture unit of each layer is aiThe target asphalt mixture permanent deformation interval is obtained according to the asphalt mixture permanent deformation interval numerical calculation formula, and finally the asphalt mixture deformation grade is evaluated according to the target asphalt mixture permanent deformation interval. This ensures the accuracy of the asphalt mixture permanent deformation interval numerical results, fully reflects the complexity of the asphalt mixture permanent deformation, solves the problem that point variables cannot fully express the complexity of the asphalt mixture permanent deformation parameters, and improves the extensiveness and applicability of the asphalt mixture permanent deformation calculation formula. This solves the technical problem of inaccurate asphalt mixture permanent deformation evaluation methods.

[0067] In addition, in order to achieve the above-mentioned objectives, the present invention also provides an asphalt mixture permanent deformation assessment system, which includes a memory, a processor, and an asphalt mixture permanent deformation assessment program stored in the memory and executable on the processor, and the asphalt mixture permanent deformation assessment program, when executed by the processor, implements the steps of the asphalt mixture permanent deformation assessment method as described in any of the above items.

[0068] In addition, in order to achieve the above-mentioned purpose, the present invention also provides a computer storage medium, on which a permanent deformation assessment program for an asphalt mixture is stored. When the permanent deformation assessment program for an asphalt mixture is executed by a processor, the steps of the permanent deformation assessment method for an asphalt mixture as described in any of the above items are implemented.

[0069] Furthermore, in order to better illustrate the effect of the present invention, the following takes a certain asphalt mixture rutting test as the object, collects its relevant data, constructs the asphalt mixture permanent deformation interval numerical calculation formula, and calculates the asphalt mixture permanent deformation;

[0070] Step 1: Assume that the test parameter T is pef 、p i 、N e3 , R 0i The three sets of values ​​are T pef (60.1, 60.2, 60.3)℃, p i (0.698, 0.702, 0.703)MPa, N e3 (1.9947×10 7 , 1.9948×10 7 , 1.9949×10 7 ) times, R 0i (1.01, 1.02, 1.03) mm; then the average value is calculated.

[0071] Step 2: Calculate the standard deviation

[0072] Step 3: The value range of the obtained parameter is T pef =[60.2-3×0.08165,60.2+3×0.08165]℃; p i =[0.701-3×0.00216,0.701+3×0.00216]MPa; N e3 =[1.9948×10 7 -3×816.496,1.9948×10 7 +3×816.496] times; R 0i =[1.02-3×0.00816,1.02+3×0.00816]mm.

[0073] Step 4: Get T pef =59.96, p i =0.6945, N e3 =19945550, R 0i =0.9955,

[0074] Step 5: Take the comprehensive correction factor k Ri =6.03, layer thickness h i =15mm, the thickness of the rutting test specimen h0 = 50mm, according to the formula Calculate the lower endpoint value of the interval number of the permanent deformation of the i-th layer of asphalt mixture, and get

[0075] R ai =2.31×10 -8 ×6.03×59.96 2.93 ×0.6945 1.80 ×19945550 0.48 ×(15 / 50)×0.9955=11.1471mm.

[0076] Step 6: Take the comprehensive correction factor k Ri =6.03, layer thickness h i =15mm, the thickness of the rutting test specimen h0 = 50mm, according to the formula Calculate the upper endpoint value of the interval number of the permanent deformation of the i-th layer of asphalt mixture, and get

[0077]

[0078] Step 7: Keep two significant digits after the decimal point and obtain the interval number of permanent deformation of the i-th layer of asphalt mixture: On the left side The interval value of the permanent deformation parameter of the i-th layer of asphalt mixture is [11.15,12.38]mm.

[0079] The permanent deformation of asphalt mixture obtained from the above examples better reflects the complex characteristics of the permanent deformation of asphalt mixture that changes within a certain range.

[0080] Directly calculated by interval operation rules, it has been verified that:

[0081] 2.31×10 -8 ×6.03×[59.96,60.44] 2.93 ×[0.6945,0.7074] 1.80 ×[19945550,19950449] 0.48 ×(15 / 50)×[0.9955,1.0445]=[11.1471,12.3770], which is consistent with the results obtained in step 5 and step 6 of the present invention.

[0082] Step 8: Repeat steps 1-7. If the interval value of the permanent deformation parameter of the i+1th layer of asphalt mixture is calculated to be [2.02, 2.16] mm, the interval value of the permanent deformation parameter of the i-th layer and the i+1-th layer of asphalt mixture can be obtained:

[0083]

[0084] The data interval variables in the present invention are relative to point variables. Point variables describe a certain point value of an object, while interval variables describe the numerical range of an object in a certain interval, which is easier to represent the complexity of an object than point variables. For example, the weight of a material is expressed as 2.74 by a point variable, but it cannot fully reflect the complex nature of the material. It can be expressed as [2.73, 2.75] by an interval variable, which can better reflect the complexity of the material's properties.

[0085] It should be noted that, in this article, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or system including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or system. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the existence of other identical elements in the process, method, article or system including the element.

[0086] The serial numbers of the above embodiments of the present invention are only for description and do not represent the advantages or disadvantages of the embodiments.

[0087] The above are only preferred embodiments of the present invention, and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A method for evaluating permanent deformation of asphalt mixture, characterized in that: The method comprises the following steps: Step 1: According to the rutting test, the permanent deformation R of each layer of asphalt mixture unit corresponding to the target asphalt mixture is obtained. ai ; Step 2: According to the calculation formula of the permanent deformation of each layer of asphalt mixture unit and the permanent deformation R of each layer of asphalt mixture unit in the rutting test ai Get the permanent deformation equivalent temperature T of each layer of asphalt mixture unit pef , vertical compressive stress P on the top surface of the i-th layer asphalt mixture unit i , the cumulative number of equivalent design axle load actions on the design lane N e3 , the permanent deformation R of the rutting test of the i-th layer asphalt mixture unit 0i The calculation formula of the permanent deformation of each layer of asphalt mixture unit is: k Ri is the comprehensive correction factor; Step 3: According to T pef , P i 、N e3 , R 0i The calculation formula of the permanent deformation of each layer of asphalt mixture unit is used to obtain the permanent deformation R of each layer of asphalt mixture unit. ai The range of interval values; Step 4: The permanent deformation R of each layer of asphalt mixture unit in step 3 is ai The range of the interval is based on the numerical calculation formula of the permanent deformation interval of asphalt mixture to obtain the target asphalt mixture permanent deformation interval, where the numerical calculation formula of the permanent deformation interval of asphalt mixture is: Step 5: Evaluate the deformation grade of the asphalt mixture according to the target asphalt mixture permanent deformation range.

2. The method for evaluating permanent deformation of asphalt mixture according to claim 1, characterized in that: In step 1, specifically: According to the existing highway asphalt pavement design specifications, a standard rutting test is carried out to obtain the rutting test permanent deformation R of each layer of asphalt mixture unit corresponding to the target asphalt mixture. ai .

3. The method for evaluating permanent deformation of asphalt mixture according to claim 1, characterized in that: Step 2 specifically includes: Step 21, according to the calculation formula of the permanent deformation of each layer of asphalt mixture unit and the rutting test permanent deformation R of each layer of asphalt mixture unit ai Get the test parameter T pef , P i 、N e3 , R 0i The standard deviation of Step 22, obtain the test parameter T according to the formula x = [p-3θ, p+3θ] pef , P i 、N e3 , R 0i The corresponding interval value range, where p is the test parameter T pef , P i 、N e3 , R 0i The corresponding average value, θ is the test parameter T pef , P i 、N e3 , R 0i The corresponding standard deviation.

4. The method for evaluating permanent deformation of asphalt mixture according to claim 3, characterized in that: In step 22, T pef The interval value range is P i The interval value range is N e3 The interval value range is R 0i The interval value range is in, T pef , P i 、N e3 , R 0i The average value of T pef , P i 、N e3 , R 0i The standard deviation of .

5. The method for evaluating permanent deformation of asphalt mixture according to claim 4, characterized in that: Step 3 is as follows: Set T determined in step 22 pef , P i 、N e3 , R 0i The interval value range is based on R ai The calculation formula for the upper and lower endpoints of the interval value determines the permanent deformation R of each layered asphalt mixture unit ai The value range of the interval.

6. The method for evaluating permanent deformation of asphalt mixture according to claim 5, characterized in that: R ai The calculation formula for the lower endpoint value of the interval is: R ai The calculation formula for the upper endpoint value of the interval is: in, 7. The method for evaluating permanent deformation of asphalt mixture according to claim 1, characterized in that: In step 1, the target asphalt mixture permanent deformation R a The permanent deformation R of each layer of asphalt mixture unit in the rutting test ai Satisfies the following formula: Where n is the total number of asphalt mixture units into which the target asphalt mixture is divided.

8. An asphalt mixture permanent deformation assessment system, characterized in that: The system includes a memory, a processor, and an asphalt mixture permanent deformation assessment program stored in the memory and executable on the processor. When the asphalt mixture permanent deformation assessment program is executed by the processor, the steps of the asphalt mixture permanent deformation assessment method as described in any one of claims 1 to 7 are implemented.

9. A computer storage medium, characterized in that The computer storage medium stores an asphalt mixture permanent deformation assessment program, and when the asphalt mixture permanent deformation assessment program is executed by the processor, the steps of the asphalt mixture permanent deformation assessment method according to any one of claims 1 to 7 are implemented.

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