CN113481782A - Temperature correction method for 20-50 ℃ deflection value of aggregate and asphalt stabilized base layer - Google Patents
Temperature correction method for 20-50 ℃ deflection value of aggregate and asphalt stabilized base layer Download PDFInfo
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- 238000012937 correction Methods 0.000 title claims abstract description 129
- 239000010426 asphalt Substances 0.000 title claims abstract description 80
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- 238000004364 calculation method Methods 0.000 claims abstract description 104
- 238000012795 verification Methods 0.000 claims abstract description 89
- 238000009795 derivation Methods 0.000 claims abstract description 23
- 239000008187 granular material Substances 0.000 claims abstract description 14
- 238000010998 test method Methods 0.000 claims abstract description 6
- 238000010219 correlation analysis Methods 0.000 claims description 18
- 238000010835 comparative analysis Methods 0.000 claims description 14
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Abstract
The application discloses a temperature correction method for 20-50 ℃ deflection value of a granular material and asphalt stabilized base layer, which comprises the following steps: collecting a dynamic deflection value; presetting a preliminary derivation formula; calling a test procedure calculation formula to obtain a temperature correction coefficient standard value in the structural layers with different depths of the granular base layer at 20-50 ℃; building data, substituting the data into a calculation model, giving different formula constants for x, y and z, and calculating an estimated value of a temperature correction coefficient; comparing and analyzing the standard value and the corresponding presumed value to obtain a difference value and a correlation coefficient; presetting a threshold value, comparing and analyzing to determine a formula constant and verifying the accuracy of the formula constant; after the verification is finished, obtaining a unified calculation formula of the temperature correction coefficient, and calculating the temperature correction coefficient; and calculating the corrected deflection value by combining the dynamic deflection value and the temperature correction coefficient. Compared with the prior art, the technical scheme provided by the invention can improve the efficiency of deflection value temperature correction calculation.
Description
Technical Field
The application relates to the technical field of pavement deflection temperature correction coefficient calculation, in particular to a temperature correction method for 20-50 ℃ deflection values of a granular material and asphalt stabilized base layer.
Background
The temperature is an important parameter for representing the service behavior of the pavement structure. In general, the temperature indicators used to evaluate the service life of a road pavement are: the temperature of the pavement structure layer, the surface temperature of the asphalt pavement, the atmospheric temperature and the like. Service performance indexes such as deflection, stress-strain response, rutting, skid resistance, road surface/tire noise and the like of the road surface are closely related to the temperature state of the road surface structure.
The deflection value is an important index for designing and detecting highway pavement engineering, the calculation of the deflection value relates to actually measured or estimated temperature of points in a granular material layer during measurement, the correction calculation of a field deflection detection value and the evaluation calculation of items such as deflection detection and the like, and the participation of a deflection temperature correction coefficient is avoided. At present, a calculation method of a deflection value and a temperature correction method thereof are determined in the existing JTG3450-2019 which is a highway subgrade and pavement site test regulation. However, when the aggregate and asphalt stabilized base layer is at 20 ℃ to 50 ℃, the deflection value temperature correction calculation in the structural layers with different depths is calculated by combining the measured value of the on-site deflection and the temperature correction coefficient, and the calculation of the temperature correction coefficient needs to replace different calculation methods according to the thicknesses of different structural layers, so that the error rate of the deflection value temperature correction calculation is increased, and the efficiency of the deflection value temperature correction calculation is seriously influenced.
Therefore, it is a technical problem to be solved by those skilled in the art how to provide a method for temperature correction of 20-50 ℃ deflection value of a pellet and asphalt stabilized base layer, which can improve the calculation efficiency of temperature correction of deflection value when the average temperature of the pellet and asphalt stabilized base layer is 20-50 ℃.
Disclosure of Invention
In order to solve the technical problems, the application provides a temperature correction method for 20-50 ℃ deflection value of a granular material and asphalt stabilized base layer, which can improve the efficiency of temperature correction calculation of the deflection value when the average temperature of the granular material and the asphalt stabilized base layer is 20-50 ℃.
The first technical scheme provided by the application is as follows:
the application provides a temperature correction method for 20-50 ℃ deflection value of a granular material and asphalt stabilized base layer, which comprises the following steps: s1: collecting the thicknesses H and the average temperature T of the aggregates and the asphalt stabilized base layer during deflection measurement, and determining that the numerical range of the average temperature T is between 20 and 50 ℃; s2: obtaining the dynamic deflection value l of the aggregate and the asphalt stabilized base layer according to the thickness and the average temperature of the base layerT(ii) a S3: acquiring a temperature correction coefficient: preliminary derivation formula K 'for calculating preset temperature correction coefficient'3(x,y,z)(ii) a S4: calling a test procedure temperature correction coefficient calculation formula to obtain standard temperature correction coefficient values, referred to as standard values, of different depth structural layers of the aggregate and asphalt stabilized base at 20-50 ℃; s5: constructing a data substitution calculation model based on a preliminary derivation formula; substituting the data into a calculation model to give different formula constants for x, y and z, and calculating to obtain estimated values of temperature correction coefficients in different depth structural layers of the stable base layer at 20-50 ℃ according to a preliminary derivation formula, which are referred to as estimated values for short; s6: substituting the input data of the standard value into the calculation model, performing difference value comparison analysis and correlation comparison analysis on the input data of the standard value and the corresponding presumed value, and obtaining a comparison difference value and a correlation coefficient; s7: presetting a difference threshold and a correlation coefficient threshold, and inputting the difference threshold and the correlation coefficient threshold into data to be substituted into a calculation model to perform comparative analysis with the comparison difference and the correlation coefficient; s8: determining specific values of formula constants x, y and z based on whether the result of the contrastive analysis meets the threshold requirement, and substituting the specific values into a preliminary derivation formula to obtain a preliminary calculation formula of the temperature correction coefficient value; s9: calculating to obtain verification values of temperature correction coefficients in different depth structural layers by using a primary calculation formula, and the verification values are shortened; carrying out correlation verification analysis on the verification value and the corresponding standard value to determine the accuracy of the x, y and z formula constants; s10: after the x, y and z formula constants are verified, substituting the formula constants into the accurate formula constants to obtain a unified calculation formula K for temperature correction coefficient values in different depth structural layers of the aggregate and asphalt stabilized base layer at the temperature of 20-50 DEG C3(H,T)Based on the unified calculation formula K3(H,T)To obtainDeflection temperature correction coefficient value K3(ii) a S11: and calculating the deflection value after temperature correction by combining the dynamic deflection value and the temperature correction coefficient.
Further, in a preferred mode of the present invention, the preliminary derivation formula of the deflection temperature correction coefficient calculation is:
K′3(x,y,z)＝e{x(Iny-1)H+z}(20-T)
in the formula: t-average temperature of the aggregate and asphalt stabilized base layer during deflection measurement; h, the thickness of the aggregate and the asphalt stabilized base layer;
x, y, z-constant of formula to be measured.
Further, in a preferred mode of the present invention, the difference threshold is 0.10, and the correlation coefficient threshold is 0.98.
Further, in a preferred mode of the present invention, in S6, the comparison rule whether the comparison result satisfies the threshold requirement includes:
if the contrast difference between the presumed value and the standard value is less than or equal to 0.10 and the correlation coefficient is greater than 0.98, determining that the specific value of the given x, y and z formula constant meets the requirement of a threshold;
otherwise, determining that the specific value of the constant of the given x, y and z formula does not meet the requirement of the threshold value.
Further, in a preferred embodiment of the present invention, the S6 includes: s601: if the comparison difference value and the correlation coefficient meet the threshold requirement, selecting a specific value of a constant of a given x, y and z formula at the moment and entering the next step; s602: if the comparison difference or the correlation coefficient does not meet the threshold requirement, returning to the step S3 to give x, y and z different formula constants again, and repeating the steps from the step S3 to the step S6.
Further, in a preferred mode of the present invention, the correlation verification analysis includes: when the average temperature of the aggregate and the asphalt stabilized base layer is 20-50 ℃, a comparison analysis chart and a correlation analysis chart of the verification value and the standard value in different depth structure layers are constructed, correlation verification coefficients of the verification value and the standard value in different depth structure layers are obtained through analysis based on the correlation analysis chart, the correlation verification coefficients are compared with the correlation coefficient threshold, and verification results are obtained.
Further, in a preferred mode of the present invention, the comparison rule between the correlation verification coefficient and the correlation coefficient threshold is:
if the correlation verification coefficients in the different depth structural layers are all larger than the correlation coefficient threshold, judging that the specific values of the given x, y and z formula constants are accurate;
and if the correlation verification coefficient in the structural layers with different depths is smaller than the correlation coefficient threshold, judging that the specific value of the given x, y and z formula constant is inaccurate.
Further, in a preferred embodiment of the present invention, the S8 includes: s801: if the specific value of the given x, y and z formula constant is judged to be accurate, the specific value of the given x, y and z formula constant at the moment is selected and the next step is carried out; s802: if the specific values of the given x, y and z formula constants are not accurate, returning to the step S3 to give different formula constants to x, y and z again, and repeating the steps from the step S3 to the step S7.
Further, in a preferred embodiment of the present invention, the formula constants x, y, z are specifically: x is 5 × 10-5,y＝16,z＝4×10-3。
Further, in a preferred embodiment of the present invention, the unified calculation formula K is used as a basis3(H,T)Obtaining the deflection temperature correction coefficient value comprises:
s901: obtaining the average temperature T and the thickness H of the structural layer in different depth structural layers during deflection measurement; wherein the numerical range of the average temperature is more than 20 ℃ and less than or equal to 50 ℃;
s902: substituting the average temperature T and the thickness H of the structural layer into the unified calculation formula K3(H,T)Calculating to obtain a deflection temperature correction coefficient value;
wherein the unified calculation formula
In the formula: t-average temperature of the aggregate and asphalt stabilized base layer during deflection measurement;
h-aggregate and asphalt stabilized base thickness.
Further, in a preferred embodiment of the present invention, the formula for calculating the deflection value temperature correction is:
l20＝lT×K3
in the formula: l20-corrected deflection values for pellet and asphalt stabilized base temperature;
lT-a dynamic deflection value; k3-a temperature correction factor.
Compared with the prior art, the temperature correction method for 20-50 ℃ deflection value of the aggregate and asphalt stabilized base layer provided by the invention comprises the following steps: s1: collecting the thicknesses H and the average temperature T of the aggregates and the asphalt stabilized base layer during deflection measurement, and determining that the numerical range of the average temperature T is between 20 and 50 ℃; s2: obtaining the dynamic deflection value l of the aggregate and the asphalt stabilized base layer according to the thickness and the average temperature of the base layerT(ii) a S3: acquiring a temperature correction coefficient: preliminary derivation formula K 'for calculating preset temperature correction coefficient'3(x,y,z)(ii) a S4: calling a test procedure temperature correction coefficient calculation formula to obtain standard temperature correction coefficient values, referred to as standard values, of different depth structural layers of the aggregate and asphalt stabilized base at 20-50 ℃; s5: constructing a data substitution calculation model based on a preliminary derivation formula; substituting the data into a calculation model to give different formula constants for x, y and z, and calculating to obtain estimated values of temperature correction coefficients in different depth structural layers of the stable base layer at 20-50 ℃ according to a preliminary derivation formula, which are referred to as estimated values for short; s6: substituting the input data of the standard value into the calculation model, performing difference value comparison analysis and correlation comparison analysis on the input data of the standard value and the corresponding presumed value, and obtaining a comparison difference value and a correlation coefficient; s7: presetting a difference threshold and a correlation coefficient threshold, and inputting the difference threshold and the correlation coefficient threshold into data to be substituted into a calculation model to perform comparative analysis with the comparison difference and the correlation coefficient; s8: determining specifics of formula constants x, y, z based on whether the results of the comparative analysis satisfy threshold requirementsSubstituting the value into a preliminary derivation formula to obtain a preliminary calculation formula of the temperature correction coefficient value; s9: calculating to obtain verification values of temperature correction coefficients in different depth structural layers by using a primary calculation formula, and the verification values are shortened; carrying out correlation verification analysis on the verification value and the corresponding standard value to determine the accuracy of the x, y and z formula constants; s10: after the x, y and z formula constants are verified, substituting the formula constants into the accurate formula constants to obtain a unified calculation formula K for temperature correction coefficient values in different depth structural layers of the aggregate and asphalt stabilized base layer at the temperature of 20-50 DEG C3(H,T)Based on the unified calculation formula K3(H,T)Obtaining a deflection temperature correction coefficient value K3(ii) a S11: and calculating the deflection value after temperature correction by combining the dynamic deflection value and the temperature correction coefficient. When the deflection is measured, if the average temperature T of the aggregate and the asphalt stabilized base is in the range of 20-50 ℃, the calculation method can be used for replacing the deflection value temperature correction calculation method in different depth structural layers in the existing highway subgrade pavement field test regulation JTG3450-2019, so that the deflection temperature correction coefficients in the different depth structural layers can be calculated by using a uniform calculation method, and the deflection value temperature correction calculation efficiency is improved. Compared with the prior art, the technical scheme of the invention can improve the calculation efficiency of the deflection value temperature correction calculation when the average temperature of the aggregate and the asphalt stabilized base layer is between 20 and 50 ℃.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a flow chart of a method for temperature correction of 20-50 ℃ sag values of a pellet and asphalt stabilized base layer provided by an embodiment of the present invention;
FIG. 2 is a flow diagram of the correlation verification analysis according to an embodiment of the present invention;
FIG. 3 is a block diagram of a process for formulating a pellet layer sag temperature correction factor according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of a first correlation analysis graph according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of a first comparative analysis chart according to an embodiment of the present invention;
FIG. 6 is a schematic diagram of a second correlation analysis graph according to an embodiment of the present invention;
FIG. 7 is a schematic diagram of a second comparative analysis chart according to an embodiment of the present invention;
FIG. 8 is a schematic diagram of a third correlation analysis graph according to an embodiment of the present invention;
FIG. 9 is a schematic illustration of a third comparative analysis chart according to an embodiment of the present invention;
FIG. 10 is a diagram of a fourth correlation analysis graph according to an embodiment of the present invention;
FIG. 11 is a diagram of a fourth comparative analysis chart according to an embodiment of the present invention.
Detailed Description
In order to make those skilled in the art better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
It will be understood that when an element is referred to as being "fixed" or "disposed" on another element, it can be directly on the other element or be indirectly disposed on the other element; when an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.
It will be understood that the terms "length," "width," "upper," "lower," "front," "rear," "first," "second," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like, as used herein, refer to an orientation or positional relationship indicated in the drawings that is solely for the purpose of facilitating the description and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the application.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "plurality" or "a plurality" means two or more unless specifically limited otherwise.
It should be understood that the structures, ratios, sizes, and the like shown in the drawings are only used for matching the disclosure of the specification, so as to be understood and read by those skilled in the art, and are not used to limit the practical limit conditions of the present application, so that the modifications of the structures, the changes of the ratio relationships, or the adjustment of the sizes, do not have the technical essence, and the modifications, the changes of the ratio relationships, or the adjustment of the sizes, are all within the scope of the technical contents disclosed in the present application without affecting the efficacy and the achievable purpose of the present application.
As shown in fig. 1 to fig. 11, the method for temperature correction of 20-50 ℃ deflection value of a pellet and asphalt stabilized base layer provided by the present invention comprises the following steps: s1: collecting the thicknesses H and the average temperature T of the aggregates and the asphalt stabilized base layer during deflection measurement, and determining that the numerical range of the average temperature T is between 20 and 50 ℃; s2: obtaining the dynamic deflection value l of the aggregate and the asphalt stabilized base layer according to the thickness and the average temperature of the base layerT(ii) a S3: acquiring a temperature correction coefficient: preliminary derivation formula K 'for calculating preset temperature correction coefficient'3(x,y,z)(ii) a S4: calling a calculation formula of temperature correction coefficient of test procedure to obtain the stability of the granules and the asphalt at 20-50 DEG CDetermining the standard value of the temperature correction coefficient in the different-depth structural layers of the base layer, which is referred to as the standard value for short; s5: constructing a data substitution calculation model based on a preliminary derivation formula; substituting the data into a calculation model to give different formula constants for x, y and z, and calculating to obtain estimated values of temperature correction coefficients in different depth structural layers of the stable base layer at 20-50 ℃ according to a preliminary derivation formula, which are referred to as estimated values for short; s6: substituting the input data of the standard value into the calculation model, performing difference value comparison analysis and correlation comparison analysis on the input data of the standard value and the corresponding presumed value, and obtaining a comparison difference value and a correlation coefficient; s7: presetting a difference threshold and a correlation coefficient threshold, and inputting the difference threshold and the correlation coefficient threshold into data to be substituted into a calculation model to perform comparative analysis with the comparison difference and the correlation coefficient; s8: determining specific values of formula constants x, y and z based on whether the result of the contrastive analysis meets the threshold requirement, and substituting the specific values into a preliminary derivation formula to obtain a preliminary calculation formula of the temperature correction coefficient value; s9: calculating to obtain verification values of temperature correction coefficients in different depth structural layers by using a primary calculation formula, and the verification values are shortened; carrying out correlation verification analysis on the verification value and the corresponding standard value to determine the accuracy of the x, y and z formula constants; s10: after the x, y and z formula constants are verified, substituting the formula constants into the accurate formula constants to obtain a unified calculation formula K for temperature correction coefficient values in different depth structural layers of the aggregate and asphalt stabilized base layer at the temperature of 20-50 DEG C3(H,T)Based on the unified calculation formula K3(H,T)Obtaining a deflection temperature correction coefficient value K3(ii) a S11: and calculating the deflection value after temperature correction by combining the dynamic deflection value and the temperature correction coefficient.
The invention provides a temperature correction method for 20-50 ℃ deflection value of a granular material and asphalt stabilized base layer, which specifically comprises the following steps: s1: collecting the thicknesses H and the average temperature T of the aggregates and the asphalt stabilized base layer during deflection measurement, and determining that the numerical range of the average temperature T is between 20 and 50 ℃; s2: obtaining the dynamic deflection value l of the aggregate and the asphalt stabilized base layer according to the thickness and the average temperature of the base layerT(ii) a S3: acquiring a temperature correction coefficient: preliminary derivation formula K 'for calculating preset temperature correction coefficient'3(x,y,z)(ii) a S4: calling a calculation formula of the temperature correction coefficient of the test procedure to obtain 2The standard value of the temperature correction coefficient in the structural layers with different depths of the aggregate and the asphalt stabilized base layer at 0-50 ℃ is called the standard value for short; s5: constructing a data substitution calculation model based on a preliminary derivation formula; substituting the data into a calculation model to give different formula constants for x, y and z, and calculating to obtain estimated values of temperature correction coefficients in different depth structural layers of the stable base layer at 20-50 ℃ according to a preliminary derivation formula, which are referred to as estimated values for short; s6: substituting the input data of the standard value into the calculation model, performing difference value comparison analysis and correlation comparison analysis on the input data of the standard value and the corresponding presumed value, and obtaining a comparison difference value and a correlation coefficient; s7: presetting a difference threshold and a correlation coefficient threshold, and inputting the difference threshold and the correlation coefficient threshold into data to be substituted into a calculation model to perform comparative analysis with the comparison difference and the correlation coefficient; s8: determining specific values of formula constants x, y and z based on whether the result of the contrastive analysis meets the threshold requirement, and substituting the specific values into a preliminary derivation formula to obtain a preliminary calculation formula of the temperature correction coefficient value; s9: calculating to obtain verification values of temperature correction coefficients in different depth structural layers by using a primary calculation formula, and the verification values are shortened; carrying out correlation verification analysis on the verification value and the corresponding standard value to determine the accuracy of the x, y and z formula constants; s10: after the x, y and z formula constants are verified, substituting the formula constants into the accurate formula constants to obtain a unified calculation formula K for temperature correction coefficient values in different depth structural layers of the aggregate and asphalt stabilized base layer at the temperature of 20-50 DEG C3(H,T)Based on the unified calculation formula K3(H,T)Obtaining a deflection temperature correction coefficient value K3(ii) a S11: and calculating the deflection value after temperature correction by combining the dynamic deflection value and the temperature correction coefficient. When the deflection is measured, if the average temperature T of the aggregate and the asphalt stabilized base is in the range of 20-50 ℃, the calculation method can be used for replacing the deflection value temperature correction calculation method in different depth structural layers in the existing highway subgrade pavement field test regulation JTG3450-2019, so that the deflection temperature correction coefficients in the different depth structural layers can be calculated by using a uniform calculation method, and the deflection value temperature correction calculation efficiency is improved. Compared with the prior art, the technical scheme of the invention has the advantages that the average temperature of the aggregate and the asphalt stabilized base is 20 ℃ to eAt 50 ℃, the calculation efficiency of the deflection value temperature correction calculation can be improved.
Specifically, in the embodiment of the present invention, in step S4, the difference comparison analysis includes: s401: calling a plurality of groups of sample data; the sample data includes the presumed value and a standard value corresponding thereto; s402: calculating a comparison difference value of the two values and a maximum value and a minimum value of the comparison difference value by combining the estimated value and the standard value; s403: obtaining the average value of the comparison difference value according to the comparison difference value, and calculating the standard deviation and the variation coefficient of the sample data based on the average value; s404: the degree of dispersion between the presumed value and the standard value is determined based on the coefficient of variation, and the validity of the presumed value is preliminarily determined.
Specifically, in the embodiment of the present invention, the difference threshold is 0.10, and the correlation coefficient threshold is 0.98.
Specifically, in the embodiment of the present invention, in S6, the comparison rule whether the comparison result meets the threshold requirement includes:
if the contrast difference between the presumed value and the standard value is less than or equal to 0.10 and the correlation coefficient is greater than 0.98, determining that the specific value of the given x, y and z formula constant meets the requirement of a threshold;
otherwise, determining that the specific value of the constant of the given x, y and z formula does not meet the requirement of the threshold value.
Specifically, in the embodiment of the present invention, in S6, the method includes: s601: if the comparison difference value and the correlation coefficient meet the threshold requirement, selecting a specific value of a constant of a given x, y and z formula at the moment and entering the next step; s602: if the comparison difference or the correlation coefficient does not meet the threshold requirement, returning to the step S3 to give x, y and z different formula constants again, and repeating the steps from the step S3 to the step S6.
Specifically, in an embodiment of the present invention, the correlation verification analysis includes: when the average temperature of the aggregate and the asphalt stabilized base layer is 20-50 ℃, a comparison analysis chart and a correlation analysis chart of the verification value and the standard value in different depth structure layers are constructed, correlation verification coefficients of the verification value and the standard value in different depth structure layers are obtained through analysis based on the correlation analysis chart, the correlation verification coefficients are compared with the correlation coefficient threshold, and verification results are obtained.
Specifically, in the embodiment of the present invention, the comparison rule between the correlation verification coefficient and the correlation coefficient threshold is:
if the correlation verification coefficients in the different depth structural layers are all larger than the correlation coefficient threshold, judging that the specific values of the given x, y and z formula constants are accurate;
and if the correlation verification coefficient in the structural layers with different depths is smaller than the correlation coefficient threshold, judging that the specific value of the given x, y and z formula constant is inaccurate.
Specifically, in the embodiment of the present invention, in S8, the method includes: s801: if the specific value of the given x, y and z formula constant is judged to be accurate, the specific value of the given x, y and z formula constant at the moment is selected and the next step is carried out; s802: if the specific values of the given x, y and z formula constants are not accurate, returning to the step S3 to give different formula constants to x, y and z again, and repeating the steps from the step S3 to the step S7.
Specifically, in the embodiment of the present invention, the formula constants x, y, z are specifically: x is 5 × 10-5,y＝16,z＝4×10-3。
Specifically, in the embodiment of the present invention, in the S8, the correlation verification analysis includes: s803: establishing a first comparative analysis chart and a first correlation analysis chart of verification values in a granular material and asphalt stabilized base layer with the H being more than 50mm and less than or equal to 100mm at the temperature of 20-50 ℃, establishing a first linear regression equation of the verification values and the standard values in the thickness structural layer according to the first correlation analysis chart, obtaining a first correlation verification coefficient of the verification values and the standard values in the thickness structural layer, and comparing the first correlation verification coefficient with a correlation coefficient threshold value to obtain a first verification result;
wherein,the first linear regression equation is: y is1＝1.0898x1-0.0916；
In the formula: x is the number of1-verification values in aggregates with H being more than 50mm and less than or equal to 100mm and asphalt stabilized base layers;
y1-standard values in aggregates with H & lt, 50mm & lt, 100mm and asphalt stabilized base;
the first correlation verification coefficient R1 2＝0.9989。
Specifically, in the embodiment of the present invention, in the S8, the correlation verification analysis further includes: s804: constructing a second comparative analysis chart and a second correlation analysis chart of verification values in the aggregate and asphalt stabilized base layer with the H being more than 100mm and less than or equal to 200mm at the temperature of 20-50 ℃, establishing a second linear regression equation of the verification values and the standard values in the thickness structural layer according to the second correlation analysis chart, obtaining a second correlation verification coefficient of the verification values and the standard values in the thickness structural layer, and comparing the second correlation verification coefficient with a correlation coefficient threshold value to obtain a second verification result;
wherein the second linear regression equation is: y is2＝0.8964x2+0.0937；
In the formula: x is the number of2-verification values in aggregates with H & lt, 100mm & lt, 200mm and asphalt stabilized base;
y2-standard values for aggregates with H & lt, 100mm & lt, 200mm and asphalt stabilized base;
the second correlation verification coefficient R2 2＝0.9975。
Specifically, in the embodiment of the present invention, in the S8, the correlation verification analysis further includes: s805: constructing a third comparative analysis chart and a third correlation analysis chart of verification values in the aggregate and asphalt stabilized base layer with H being more than 200mm and less than or equal to 300mm at the temperature of 20-50 ℃, establishing a third linear regression equation of the verification values and the standard values in the thickness structural layer according to the third correlation analysis chart, obtaining a third correlation verification coefficient of the verification values and the standard values in the thickness structural layer, and comparing the third correlation verification coefficient with a correlation coefficient threshold value to obtain a third verification result;
wherein the third linear regression equation is: y is3＝0.9278x3+0.0475；
In the formula: x is the number of3-verification values in aggregates with H & lt, 200mm & lt, 300mm and asphalt stabilized base;
y3-standard values for aggregates with H & lt, 200mm & lt, 300mm and asphalt stabilized base;
the third correlation verification coefficient R3 2＝0.9930。
Specifically, in the embodiment of the present invention, in the S8, the correlation verification analysis further includes: s806: establishing a fourth comparative analysis chart and a fourth correlation analysis chart of verification values in the aggregate and asphalt stabilized base layer with H being more than or equal to 300mm at the temperature of 20-50 ℃ and standard values in a structural layer with the same thickness, establishing a fourth linear regression equation of the verification values and the standard values in the structural layer with the thickness according to the fourth correlation analysis chart, obtaining a fourth correlation verification coefficient of the verification values and the standard values in the structural layer with the thickness, and comparing the fourth correlation verification coefficient with a correlation coefficient threshold value to obtain a fourth verification result;
the fourth linear regression equation is: y is4＝0.9347x4+0.0145；
In the formula: x is the number of4-verification values in aggregates with H ≥ 300mm and asphalt stabilized base;
y4h is more than or equal to the standard value in 300mm granules and asphalt stable base layers;
the fourth correlation verification coefficient R4 2＝0.9863。
Specifically, in the embodiment of the present invention, if the first correlation verification coefficient, the second correlation verification coefficient, the third correlation verification coefficient, and the fourth correlation verification coefficient are all greater than the correlation coefficient threshold, the specific value of the given x, y, z formula constant is an accurate value.
Specifically, in the embodiment of the present invention, the calculation formula of the deflection value temperature correction calculation is as follows:
l20＝lT×K3
in the formula: l20-corrected deflection values for pellet and asphalt stabilized base temperature;
lT-a dynamic deflection value; k3-a temperature correction factor.
More specifically, the deflection value is an important index for designing and detecting highway pavement highway engineering, the calculation of the deflection value relates to actually measured or estimated temperature of points in a granular material layer during measurement, the correction calculation of a field deflection detection value and the evaluation calculation of items such as deflection detection and the like, and the participation of a deflection temperature correction coefficient is avoided. At present, a calculation method of a deflection value and a temperature correction method thereof are determined in the existing JTG3450-2019 which is a highway subgrade and pavement site test regulation. However, when the aggregate and asphalt stabilized base layer is at 0 ℃ to 20 ℃, the deflection value temperature correction calculation in the structural layers with different depths is calculated by combining the measured value of the on-site deflection and the temperature correction coefficient, and the calculation of the temperature correction coefficient needs to replace different calculation methods according to the thicknesses of different structural layers, so that the error rate of the deflection value temperature correction calculation is increased, and the efficiency of the deflection value temperature correction calculation is seriously influenced. The temperature correction coefficient is calculated as follows:
the invention provides a temperature correction method for 20-50 ℃ deflection values of a granular material and an asphalt stabilized base layer, when the average temperature T of the granular material and the asphalt stabilized base layer is in the range of 20-50 ℃, the calculation method can replace the calculation method for temperature correction of the deflection values in different depth structural layers of the existing road subgrade pavement site test regulation JTG3450-2019, so that the calculation of the deflection temperature correction coefficient values in the different depth structural layers can use a unified calculation method and use a unified calculation formula:
the temperature correction coefficient values in different depth structural layers during deflection measurement can be calculated, so that the efficiency of deflection value temperature correction calculation is improved. Compared with the prior art, the technical scheme of the invention can improve the calculation efficiency of the deflection value temperature correction calculation when the average temperature of the aggregate and the asphalt stabilized base layer is between 20 and 50 ℃.
As described above, according to the temperature correction method for 20-50 ℃ deflection values of the aggregate and asphalt stabilized base layer in the embodiment of the present invention, a uniform calculation method can be used for the deflection temperature correction coefficient values in different depth structural layers of the aggregate and asphalt stabilized base layer, and the deflection temperature correction values in different depth structural layers of the aggregate layer road table can be calculated without changing a formula constant, so that the efficiency of the deflection value temperature correction calculation is improved. Compared with the prior art, the technical scheme of the invention can improve the calculation efficiency of the deflection value temperature correction calculation when the average temperature of the aggregate and the asphalt stabilized base layer is between 20 and 50 ℃.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A temperature correction method for 20-50 ℃ deflection value of a granular material and asphalt stabilized base layer is characterized by comprising the following steps:
s1: collecting the thicknesses H and the average temperature T of the aggregates and the asphalt stabilized base layer during deflection measurement, and determining that the numerical range of the average temperature T is between 20 and 50 ℃;
s2: movement of the pellet and asphalt stabilized base is obtained based on the thickness of the base and the average temperatureDynamic deflection value lT；
S3: acquiring a temperature correction coefficient: preliminary derivation formula K 'for calculating preset temperature correction coefficient'3(x,y,z)；
S4: calling a test procedure temperature correction coefficient calculation formula to obtain standard temperature correction coefficient values, referred to as standard values, of different depth structural layers of the aggregate and asphalt stabilized base at 20-50 ℃;
s5: constructing a data substitution calculation model based on a preliminary derivation formula; substituting the data into a calculation model to give different formula constants for x, y and z, and calculating to obtain estimated values of temperature correction coefficients in different depth structural layers of the stable base layer at 20-50 ℃ according to a preliminary derivation formula, which are referred to as estimated values for short;
s6: substituting the input data of the standard value into the calculation model, performing difference value comparison analysis and correlation comparison analysis on the input data of the standard value and the corresponding presumed value, and obtaining a comparison difference value and a correlation coefficient;
s7: presetting a difference threshold and a correlation coefficient threshold, and inputting the difference threshold and the correlation coefficient threshold into data to be substituted into a calculation model to perform comparative analysis with the comparison difference and the correlation coefficient;
s8: determining specific values of formula constants x, y and z based on whether the result of the contrastive analysis meets the threshold requirement, and substituting the specific values into a preliminary derivation formula to obtain a preliminary calculation formula of the temperature correction coefficient value;
s9: calculating to obtain verification values of temperature correction coefficients in different depth structural layers by using a primary calculation formula, and the verification values are shortened; carrying out correlation verification analysis on the verification value and the corresponding standard value to determine the accuracy of the x, y and z formula constants;
s10: after the x, y and z formula constants are verified, substituting the formula constants into the accurate formula constants to obtain a unified calculation formula K for temperature correction coefficient values in different depth structural layers of the aggregate and asphalt stabilized base layer at the temperature of 20-50 DEG C3(H,T)Based on the unified calculation formula K3(H,T)Obtaining a deflection temperature correction coefficient value K3；
S11: and calculating the deflection value after temperature correction by combining the dynamic deflection value and the temperature correction coefficient.
2. The method of temperature correction of 20-50 ℃ deflection value of an aggregate and asphalt stabilized base layer according to claim 1, wherein the preliminary derivation formula of deflection temperature correction coefficient calculation is:
K′3(x,y,z)＝e{x(Iny-1)H+z}(20-T)
in the formula: t-average temperature of the aggregate and asphalt stabilized base layer during deflection measurement; h, the thickness of the aggregate and the asphalt stabilized base layer; x, y, z-constant of formula to be measured.
3. The method for temperature modification of a 20 ℃ to 50 ℃ sag value of an aggregate and asphalt stabilized base layer according to claim 1, wherein the difference threshold is 0.10 and the correlation coefficient threshold is 0.98.
4. The method for temperature modification of 20-50 ℃ deflection value of a pellet and asphalt stabilized base layer according to claim 3, wherein the comparison rule of whether the comparison result satisfies the threshold requirement in S6 includes:
if the contrast difference between the presumed value and the standard value is less than or equal to 0.10 and the correlation coefficient is greater than 0.98, determining that the specific value of the given x, y and z formula constant meets the requirement of a threshold;
otherwise, determining that the specific value of the constant of the given x, y and z formula does not meet the requirement of the threshold value.
5. The method for temperature correction of 20-50 ℃ deflection value of a pellet and asphalt stabilized base layer according to claim 4, wherein in said S6, the method comprises: s601: if the comparison difference value and the correlation coefficient meet the threshold requirement, selecting a specific value of a constant of a given x, y and z formula at the moment and entering the next step; s602: if the comparison difference or the correlation coefficient does not meet the threshold requirement, returning to the step S3 to give x, y and z different formula constants again, and repeating the steps from the step S3 to the step S6.
6. The method of temperature correction of 20-50 ℃ deflection value of an aggregate and asphalt stabilized base layer according to claim 1, wherein said correlation verification analysis comprises: when the average temperature of the aggregate and the asphalt stabilized base layer is 20-50 ℃, a comparison analysis chart and a correlation analysis chart of the verification value and the standard value in different depth structure layers are constructed, correlation verification coefficients of the verification value and the standard value in different depth structure layers are obtained through analysis based on the correlation analysis chart, the correlation verification coefficients are compared with the correlation coefficient threshold, and verification results are obtained.
7. The method for temperature correction of 20-50 ℃ deflection value of an aggregate and asphalt stabilized base layer according to claim 6, wherein the rule for comparing the correlation verification coefficient with the correlation coefficient threshold value is:
if the correlation verification coefficients in the different depth structural layers are all larger than the correlation coefficient threshold, judging that the specific values of the given x, y and z formula constants are accurate;
and if the correlation verification coefficient in the structural layers with different depths is smaller than the correlation coefficient threshold, judging that the specific value of the given x, y and z formula constant is inaccurate.
8. The method for temperature correction of 20-50 ℃ deflection value of a pellet and asphalt stabilized base layer according to claim 7, wherein in S8, the method comprises: s801: if the specific value of the given x, y and z formula constant is judged to be accurate, the specific value of the given x, y and z formula constant at the moment is selected and the next step is carried out; s802: if the specific values of the given x, y and z formula constants are not accurate, returning to the step S3 to give different formula constants to x, y and z again, and repeating the steps from the step S3 to the step S7.
9. The method of temperature modification of a 20 ℃ to 50 ℃ deflection value of a pellet and asphalt stabilized base layer of claim 8, wherein the formula constants x, y, z are: x is 5 × 10-5,y＝16,z＝4×10-3。
10. The method of claim 9, wherein the temperature correction of 20 ℃ to 50 ℃ deflection value is based on a unified calculation formula K3(H,T)Obtaining the deflection temperature correction coefficient value comprises:
s901: obtaining the average temperature T and the thickness H of the structural layer in different depth structural layers during deflection measurement; wherein the numerical range of the average temperature is more than 20 ℃ and less than or equal to 50 ℃;
s902: substituting the average temperature T and the thickness H of the structural layer into the unified calculation formula K3(H,T)Calculating to obtain a deflection temperature correction coefficient value;
wherein the unified calculation formula
In the formula: t-average temperature of the aggregate and asphalt stabilized base layer during deflection measurement;
h-aggregate and asphalt stabilized base thickness.
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