A method, system and storage medium for evaluating permanent deformation of asphalt mixture

Abstract

The application discloses a kind of asphalt mixture permanent deformation evaluation method, system and storage medium, the method is according to rut test to obtain the rut test permanent deformation amount R of each layer asphalt mixture unit corresponding to target asphalt mixture ai ;And according to each layer asphalt mixture unit permanent deformation amount calculation formula and the rut test permanent deformation amount R ai Of each layer asphalt mixture unit, the interval value range of T pef ,P i ,N e3 ,R 0i It is obtained, and the interval value range of each layer asphalt mixture unit permanent deformation amount R ai It is obtained according to each layer asphalt mixture unit permanent deformation amount calculation formula;So that the interval value range of each layer asphalt mixture unit permanent deformation amount R ai According to asphalt mixture permanent deformation interval numerical value calculation formula, the permanent deformation interval of target asphalt mixture is obtained, and finally the deformation grade of asphalt mixture is evaluated according to the permanent deformation interval of target asphalt mixture.Further, the method solves the problem that existing asphalt mixture permanent deformation evaluation method is not accurate.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of asphalt mixture, in particular to an asphalt mixture permanent deformation evaluation method, system and storage medium. BACKGROUND

[0002] At present, asphalt pavement is the most commonly used pavement in road construction. With global warming, the temperature is rising, and the temperature of asphalt pavement is also rising, which reduces the bearing capacity of asphalt mixture in the summer high temperature season. The road surface is prone to permanent deformation under the repeated action of vehicle load, forming ruts. In addition, the traffic volume is increasing, which causes serious rutting and other diseases, seriously affecting the performance of the road. The existing method for determining the deformation of asphalt pavement is to obtain asphalt rutting test data. However, the asphalt rutting test data is distributed in a probabilistic manner, which does not conform to the actual situation and leads to inaccurate calculation results of permanent deformation.

[0003] The existing patent with the patent number CN102331249A discloses an asphalt pavement permanent deformation evaluation method. It divides the environmental 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 of each sub-layer and the average deviatoric stress value. Although it is reasonable to use the superposition principle, mechanical analysis and asphalt mixture deformation analysis tools or means, and fully considers the influence of vehicle load, pavement material properties and temperature conditions on the permanent deformation of asphalt pavement, it can realize timely evaluation of the permanent deformation of asphalt pavement, but it cannot actually reflect the actual permanent deformation of asphalt pavement. SUMMARY

[0004] The main purpose of the present application is to provide an asphalt mixture permanent deformation evaluation method, system and storage medium, which aims to solve the technical problem of inaccurate existing asphalt mixture permanent deformation evaluation method.

[0005] To achieve the above-mentioned purpose, the present application provides an asphalt mixture permanent deformation evaluation method, which comprises the following steps:

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

[0007] Step 2: 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 R ai , the permanent deformation equivalent temperature T pef of each layer of asphalt mixture unit is obtained, and the vertical compressive stress P of the top surface of the i-th layer of asphalt mixture unit is obtainedi , design lane on the equivalent design axle load cumulative number of times N e3 , rut test permanent deformation of the i-th layer asphalt mixture unit R 0i , wherein the calculation formula of the permanent deformation of each layer asphalt mixture unit is:

[0008] k Ri is a comprehensive correction coefficient;

[0009] Step 3, according to T pef , P i , N e3 , R 0i interval range and the calculation formula of the permanent deformation of each layer asphalt mixture unit to obtain the interval value range of the permanent deformation of each layer asphalt mixture unit R ai ;

[0010] Step 4, the interval value range of the permanent deformation of each layer asphalt mixture unit R ai in step 3 is obtained according to the asphalt mixture permanent deformation interval value calculation formula to obtain the target asphalt mixture permanent deformation interval, wherein the asphalt mixture permanent deformation interval value calculation formula is:

[0011]

[0012] Step 5, according to the target asphalt mixture permanent deformation interval to evaluate the deformation grade of the asphalt mixture.

[0013] Optionally, in step 1, specifically:

[0014] According to the standard rut test of the existing highway asphalt pavement design specification requirements, the rut test permanent deformation of each layer asphalt mixture unit R ai corresponding to the target asphalt mixture is obtained.

[0015] Optionally, in step 2, specifically includes:

[0016] Step 21, according to the calculation formula of the permanent deformation of each layer asphalt mixture unit and the rut test permanent deformation of each layer asphalt mixture unit R ai , the standard deviation of test parameters T pef , P i , N e3 , R 0i is obtained;

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

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

[0019] The interval value range of P i is

[0020] The interval value range of N e3 is

[0021] The interval value range of R 0i is

[0022] wherein is the average value of T pef , P i , N e3 , R 0i in turn; is the standard deviation of T pef , P i , N e3 , R 0i in turn.

[0023] Optionally, the step 3 is specifically:

[0024] The interval value range of T pef , P i , N e3 , R 0i in the step 22 is determined according to the upper endpoint value and the lower endpoint value calculation formula of the interval value of R ai to determine the interval value range of the permanent deformation R ai of each hierarchical asphalt mixture unit.

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

[0026]

[0027] The upper endpoint value calculation formula of the interval value of R ai 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 asphalt mixture unit in the rutting test ai Satisfy 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, to achieve the above objectives, the present invention also provides an asphalt mixture permanent deformation assessment system, the system comprising a memory, a processor, and an asphalt mixture permanent deformation assessment program stored in the memory and executable on the processor, wherein 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 above.

[0034] In addition, to achieve the above objectives, the present invention also provides a computer storage medium storing an asphalt mixture permanent deformation assessment program, which, when executed by a processor, implements the steps of the asphalt mixture permanent deformation assessment method as described in any of the above claims.

[0035] Beneficial effects:

[0036] This invention obtains the permanent deformation R of each asphalt mixture unit corresponding to the target asphalt mixture through rutting tests. ai Based on the calculation formula for the permanent deformation of each asphalt mixture unit and the permanent deformation R from the rutting test of each asphalt mixture unit, ai Get T pef P i N e3 R 0i The range of values ​​for T; and according to T pef P i N e3 R 0i The range of the interval and the formula for calculating the permanent deformation of each asphalt mixture unit are used to obtain the permanent deformation R of each asphalt mixture unit. ai The range of values ​​for; and the permanent deformation R of each asphalt mixture unit. aiThe interval value range of the permanent deformation of the target asphalt mixture is obtained according to the permanent deformation interval numerical calculation formula of the asphalt mixture, and finally, the deformation grade of the asphalt mixture is evaluated according to the permanent deformation interval of the target asphalt mixture, so that the method for calculating the permanent deformation of the asphalt mixture can not only ensure the accuracy of the interval numerical result of the permanent deformation of the asphalt mixture, but also fully reflect the complexity of the permanent deformation of the asphalt mixture, solve the problem that the point variable cannot fully express the complexity of the permanent deformation parameter of the asphalt mixture, and improve the universality and applicability of the permanent deformation calculation formula of the asphalt mixture. BRIEF DESCRIPTION OF DRAWINGS

[0037] Figure 1 It is the flowchart of the first embodiment of the asphalt mixture permanent deformation evaluation method of the present application.

[0038] The implementation, functional features and advantages of the present application will be further described with reference to the embodiments and the accompanying drawings. DETAILED DESCRIPTION

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

[0040] As shown in Figure 1 , the present application provides an asphalt mixture permanent deformation evaluation method, which comprises the following steps:

[0041] Step 1, according to the rut test, the permanent deformation R ai of the target asphalt mixture corresponding to each layer of asphalt mixture unit is obtained; specifically, the standard rut test is carried out according to the requirements of the Highway Asphalt Pavement Design Specification JTGD50-2017, and the permanent deformation R ai of the target asphalt mixture corresponding to each layer of asphalt mixture unit is obtained. The permanent deformation R a of the target asphalt mixture and the permanent deformation R ai of each layer of asphalt mixture unit satisfy the following formula:

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

[0043] Step 2, according to the permanent deformation calculation formula of each layer of asphalt mixture unit and the permanent deformation R ai of each layer of asphalt mixture unit, the permanent deformation equivalent temperature T pef of each layer of asphalt mixture unit, the vertical compressive stress (MPa) P i of the top surface of the i-th layer of asphalt mixture unit, and the equivalent design axle load cumulative action frequency N e3The permanent deformation R of the rutting test of the i-th asphalt mixture unit 0i The range of values ​​is defined as follows: R0i refers to the permanent deformation (mm) of the i-th layer of asphalt mixture under test conditions of 60℃, 0.7MPa, and 2520 loading cycles. The thickness of the i-th layer of asphalt mixture is h. i The thickness of the rutting test specimen is h0.

[0044] The formula for calculating the permanent deformation of each asphalt mixture unit is as follows:

[0045] k Ri For the comprehensive correction coefficient, and parameter T pef p i N e3 R 0i >0, and T pef p i N e3 R 0i For a series of multiplication operations, 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...), i.e.

[0046]

[0047] Specifically, step 2 includes:

[0048] Step 21: Based on the calculation formula for the permanent deformation of each asphalt mixture unit and the permanent deformation R from the rutting test of each asphalt mixture unit... ai Obtain the experimental parameter T pef P i N e3 R 0i Standard deviation;

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

[0050] T pef The interval value range of the corresponding standard deviation, and the interval value range of the above parameters are as follows:

[0051] P i The interval value range of the corresponding standard deviation, and the interval value range of the above parameters are as follows:

[0052] N e3 The interval value range of the corresponding standard deviation, and the interval value range of the above parameters are as follows:

[0053] R 0i The interval value range of the corresponding standard deviation, and the interval value range of the above parameters are as follows:

[0054] Wherein, The average value of T pef , P i , N e3 , R 0i , respectively; The standard deviation of T pef , P i , N e3 , R 0i , respectively.

[0055] Step 3, according to the interval range of T pef , P i , N e3 , R 0i and the calculation formula of the permanent deformation amount of each layer asphalt mixture unit, the interval value range of the permanent deformation amount R ai of each layer asphalt mixture unit is obtained, that is, the interval value range of T pef , P i , N e3 , R 0i is brought into the upper endpoint and lower endpoint value calculation formula of R ai interval value, and then the interval value range of the permanent deformation amount R ai of each layer asphalt mixture unit is obtained.

[0056] Wherein, the lower endpoint value calculation formula of R ai interval value is:

[0057]

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

[0059]

[0060] in,

[0061] Step 4, calculate the permanent deformation R of each asphalt mixture unit in Step 3. ai The range of values ​​is obtained based on the numerical calculation formula for the permanent deformation range of asphalt mixtures, which is the range of permanent deformation of the target asphalt mixture.

[0062]

[0063] Then, the lower endpoint of the interval number result of the permanent deformation of the asphalt mixture units from the 1st to the nth layer is accumulated, and this is taken as the lower endpoint of the interval value of the permanent deformation of the asphalt mixture. The upper endpoint of the interval number result of the permanent deformation of the asphalt mixture units from the 1st to the nth layer is also taken as the upper endpoint of the interval value of the permanent deformation of the asphalt mixture. R ai , The result calculated in step 4, i.e.

[0064]

[0065] Step 5, based on the target asphalt mixture permanent deformation range To assess the deformation grade of asphalt mixtures.

[0066] This invention obtains the permanent deformation R of each asphalt mixture unit corresponding to the target asphalt mixture through rutting tests. ai Based on the calculation formula for the permanent deformation of each asphalt mixture unit and the permanent deformation R from the rutting test of each asphalt mixture unit, ai Get T pef P i N e3 R 0i The range of values ​​for T; and according to T pef P i N e3 R 0i The range of the interval and the formula for calculating the permanent deformation of each asphalt mixture unit are used to obtain the permanent deformation R of each asphalt mixture unit. ai The range of values ​​for the interval; and the permanent deformation R of each asphalt mixture unit. aiThe interval value range of the permanent deformation of the asphalt mixture is obtained according to the interval numerical calculation formula of the permanent deformation of the asphalt mixture, and finally, the deformation grade of the asphalt mixture is evaluated according to the interval of the permanent deformation of the target asphalt mixture. Therefore, the accuracy of the interval numerical result of the permanent deformation of the asphalt mixture is ensured, the complexity of the permanent deformation of the asphalt mixture is fully reflected, the problem that the point variable cannot fully express the complexity of the permanent deformation parameter of the asphalt mixture is solved, and the universality and applicability of the permanent deformation calculation formula of the asphalt mixture are improved. Further, the technical problem that the existing evaluation method of the permanent deformation of the asphalt mixture is inaccurate is solved.

[0067] In addition, in order to achieve the above object, the present application also provides an asphalt mixture permanent deformation evaluation system, which comprises a memory, a processor and an asphalt mixture permanent deformation evaluation program stored on the memory and executable on the processor, and the steps of the asphalt mixture permanent deformation evaluation method according to any one of the above are implemented when the asphalt mixture permanent deformation evaluation program is executed by the processor.

[0068] In addition, in order to achieve the above object, the present application also provides a computer storage medium, which stores an asphalt mixture permanent deformation evaluation program, and the steps of the asphalt mixture permanent deformation evaluation method according to any one of the above are implemented when the asphalt mixture permanent deformation evaluation program is executed by a processor.

[0069] Further, in order to better illustrate the effect of the present application, the following takes a certain asphalt mixture rut test as an object, collects relevant data, constructs an interval numerical calculation formula of the permanent deformation of the asphalt mixture, and calculates the permanent deformation of the asphalt mixture.

[0070] Step 1: assuming that the values of the test parameters T pef , p i , N e3 , R 0i in the parallel test of the asphalt mixture rut are respectively 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, and R 0i (1.01, 1.02, 1.03)mm, then the average value is calculated as

[0071] Step 2: the standard deviation is calculated as

[0072] Step 3: the value range of the available parameters is T pef = [60.2-3x0.08165, 60.2+3x0.08165]℃; p i = [0.701-3x0.00216, 0.701+3x0.00216]MPa; N e3 = [1.9948x10 7 -3x816.496, 1.9948x10 7 +3x816.496] times; R 0i = [1.02-3x0.00816, 1.02+3x0.00816]mm.

[0073] Step 4: the value range of the available parameters is T T pef = 59.96, p i = 0.6945, N e3 = 19945550, R 0i = 0.9955,

[0074] Step 5: take the comprehensive correction coefficient k Ri = 6.03, the thickness of the layer h i = 15mm, the thickness of the rut test specimen h0=50mm, the lower endpoint value of the interval number result of the permanent deformation of the i-th layer of asphalt mixture is obtained by calculating according to the formula

[0075] R ai = 2.31x10 -8 x 6.03x59.96 2.93 x 0.6945 1.80 x 19945550 0.48 x (15 / 50)x 0.9955=11.1471mm.

[0076] Step 6: take the comprehensive correction coefficient k Ri = 6.03, the thickness of the layer h i = 15mm, the thickness of the rut test specimen h0=50mm, the upper endpoint value of the interval number result of the permanent deformation of the i-th layer of asphalt mixture is obtained by calculating according to the formula

[0077] ​​

[0078] Step 7: keep two significant figures after the decimal point, and the interval result of the permanent deformation of the i-th layer asphalt mixture is That is, the left side of the formula The interval value of the permanent deformation parameter of the i-th layer asphalt mixture is [11.15, 12.38] mm.

[0079] The permanent deformation of the asphalt mixture obtained from the above example better reflects the complex characteristics of the permanent deformation of the asphalt mixture in a certain interval range.

[0080] Directly calculated by the interval operation rule, it is verified that:

[0081] 2.31x10 -8 x 6.03x [59.96, 60.44] 2.93 x [0.6945, 0.7074] 1.80 x [19945550, 19950449] 0.48 x (15 / 50) x [0.9955, 1.0445] = [11.1471, 12.3770], which is consistent with the results obtained in steps 5 and 6 of the present application.

[0082] Step 8: repeat steps 1-7, if the interval value of the permanent deformation parameter of the i+1-th layer asphalt mixture is calculated as [2.02, 2.16] mm, then the interval value of the permanent deformation parameter of the i-th and i+1-th layers of asphalt mixture is:

[0083]

[0084] The data interval variable in the present application is relative to the point variable. The point variable describes a certain point value of a thing, while the interval variable describes the numerical range of a thing in a certain interval, which is more likely to represent the complexity of the thing than the point variable. For example, the specific gravity of a certain material is represented by a point variable as 2.74, but it cannot fully reflect the complex nature of the material. The interval variable can be used to represent [2.73, 2.75] and the like, which can better reflect the complexity of the material properties.

[0085] It should be noted that in this document, the terms "comprise", "contain" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or system including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such a process, method, article or system. Without more limitations, the element defined by the statement "comprises a" does not exclude the presence of another identical element in the process, method, article or system that includes the element.

[0086] The above-mentioned embodiment numbers of the application are only for description, and do not represent the advantages and disadvantages of the embodiments.

[0087] The above is only the preferred embodiment of the application, and does not limit the patent scope of the application. Any equivalent structure or equivalent process transformation, or direct or indirect application in other related technical fields, which is made by using the content of the specification and drawings of the application, is also included in the patent protection scope of the application.

Claims

1. A method for evaluating the permanent deformation of asphalt mixtures, characterized in that, The method includes the following steps: Step 1: Obtain the permanent deformation R of each asphalt mixture unit corresponding to the target asphalt mixture based on the rutting test. ai ; Step 2: Based on the calculation formula for the permanent deformation of each asphalt mixture unit and the permanent deformation R from the rutting test of each asphalt mixture unit... ai The permanent deformation equivalent temperature T of each asphalt mixture unit was obtained. pef The vertical compressive stress P on the top surface of the i-th layer asphalt mixture unit i The cumulative number of times the equivalent design axle load on the design lane is N. e3 The permanent deformation R of the rutting test of the i-th asphalt mixture unit 0i The range of values ​​for is given, where the formula for calculating the permanent deformation of each asphalt mixture unit is: k Ri For the comprehensive correction factor, h i h0 is the thickness of the i-th asphalt mixture unit, and h0 is the thickness of the rutting test specimen. Step 3, according to T pef P i N e3 R 0i The range of the interval and the formula for calculating the permanent deformation of each asphalt mixture unit are used to obtain the permanent deformation R of each asphalt mixture unit. ai The range of values ​​that can be taken in the interval; Step 4, calculate the permanent deformation R of each asphalt mixture unit in Step 3. ai The range of values ​​is obtained based on the numerical calculation formula for the permanent deformation range of asphalt mixtures, which is the range of permanent deformation of the target asphalt mixture. Where R ai For R ai The lower endpoint of the range. For R ai The upper endpoint of the range; Step 5: Evaluate the deformation grade of the asphalt mixture based on the target permanent deformation range; And step 2 specifically includes: Step 21: Based on the calculation formula for the permanent deformation of each asphalt mixture unit and the permanent deformation R from the rutting test of each asphalt mixture unit... ai Obtain the experimental parameter T pef P i N e3 R 0i Standard deviation; Step 22: Obtain the experimental parameter T according to the formula x = [p - 3θ, p + 3θ]. pef P i N e3 R 0i The corresponding interval range, where p is the experimental parameter T. pef P i N e3 R 0i The corresponding average value, θ is the experimental parameter T pef P i N e3 R 0i The corresponding standard deviation; Among them, T pef The range of values ​​for is P i The range of values ​​for is N e3 The range of values ​​for is R 0i The range of values ​​for is in, T in sequence pef P i N e3 R 0i The average value; T in sequence pef P i N e3 R 0i The standard deviation.

2. The method for evaluating permanent deformation of asphalt mixtures according to claim 1, characterized in that, In step 1, the specific steps are as follows: Standard rutting tests were conducted according to the existing highway asphalt pavement design specifications to obtain the permanent deformation R of each asphalt mixture unit corresponding to the target asphalt mixture. ai .

3. The method for evaluating permanent deformation of asphalt mixtures according to claim 1, characterized in that, Step 3 specifically involves: Determine T in step 22 pef P i N e3 R 0i The range of values ​​for the interval is based on R. ai The formula for calculating the upper and lower endpoints of the interval values ​​determines the permanent deformation R of each layer of asphalt mixture unit. ai The range of values ​​that can be taken in the interval.

4. The method for evaluating permanent deformation of asphalt mixtures according to claim 3, characterized in that, R ai The formula for calculating the lower endpoint of the interval is: R ai The formula for calculating the upper endpoint of the interval is: in, 5. The method for evaluating permanent deformation of asphalt mixtures as described in claim 1, characterized in that, In step 1, the permanent deformation R of the target asphalt mixture a The permanent deformation R of each asphalt mixture unit in the rutting test ai Satisfy the following formula: Where n is the total number of asphalt mixture units into which the target asphalt mixture is divided.

6. A permanent deformation assessment system for asphalt mixtures, 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, wherein 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 one of claims 1 to 5.

7. A computer storage medium, characterized in that, The computer storage medium stores an asphalt mixture permanent deformation assessment program, which, when executed by a processor, implements the steps of the asphalt mixture permanent deformation assessment method as described in any one of claims 1 to 5.

Images