CN114397656A - Dynamic asphalt pavement thickness adjusting method based on three-dimensional ground penetrating radar - Google Patents

Dynamic asphalt pavement thickness adjusting method based on three-dimensional ground penetrating radar Download PDF

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CN114397656A
CN114397656A CN202210032782.1A CN202210032782A CN114397656A CN 114397656 A CN114397656 A CN 114397656A CN 202210032782 A CN202210032782 A CN 202210032782A CN 114397656 A CN114397656 A CN 114397656A
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thickness
value
layer
asphalt
ground penetrating
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李鹏飞
胡观峰
王大为
陶洁璇
王东旭
洪斌
吕浩天
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Heilongjiang Highway Construction Center
Harbin Institute of Technology
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Harbin Institute of Technology
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
    • G01S13/88—Radar or analogous systems specially adapted for specific applications
    • G01S13/885—Radar or analogous systems specially adapted for specific applications for ground probing
    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
    • E01C23/00—Auxiliary devices or arrangements for constructing, repairing, reconditioning, or taking-up road or like surfaces
    • E01C23/01—Devices or auxiliary means for setting-out or checking the configuration of new surfacing, e.g. templates, screed or reference line supports; Applications of apparatus for measuring, indicating, or recording the surface configuration of existing surfacing, e.g. profilographs
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B15/00—Measuring arrangements characterised by the use of electromagnetic waves or particle radiation, e.g. by the use of microwaves, X-rays, gamma rays or electrons
    • G01B15/02—Measuring arrangements characterised by the use of electromagnetic waves or particle radiation, e.g. by the use of microwaves, X-rays, gamma rays or electrons for measuring thickness

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Abstract

A method for dynamically adjusting the thickness of an asphalt pavement based on a three-dimensional ground penetrating radar belongs to the technical field of three-dimensional ground penetrating radar detection. The method aims to solve the problems of inconvenient operation and large workload in manual real-time paving thickness inspection and the problems of low accuracy and poor representativeness of detection results. The method comprises the steps of firstly, collecting three-dimensional ground penetrating radar data, identifying and tracking a lower-layer asphalt surface continuous signal and an asphalt layer bottom continuous signal in a radar image, and calculating to obtain an asphalt pavement thickness data set; then dividing the asphalt pavement into paving adjustment units, and calculating the thickness mean value of each unit; and calculating a thickness compensation value required by a standard acceptance standard thickness representative value and a thickness compensation value required by a minimum thickness value based on the design value of the thickness of the lower-layer asphalt layer and the minimum value of the thickness of the lower-layer asphalt layer respectively, determining an upper-layer asphalt layer thickness adjustment value by combining the design value of the thickness of the upper-layer asphalt layer, and further determining a unit upper-layer paving thickness adjustment value. The invention is used for dynamically adjusting the thickness of the asphalt pavement.

Description

Dynamic asphalt pavement thickness adjusting method based on three-dimensional ground penetrating radar
The technical field is as follows:
the invention belongs to the technical field of three-dimensional ground penetrating radar detection, and particularly relates to a method for dynamically adjusting the thickness of an asphalt pavement based on a three-dimensional ground penetrating radar.
Background art:
the thickness of the asphalt pavement is one of the most important indexes for engineering quality control and maintenance. Whether the thickness of the newly-built asphalt pavement or the thickness of the added pavement reaches the designed thickness is the basis of construction quality evaluation; the index of the surface layer of the asphalt pavement is the most important step in calculating the modulus of the road structure layer, and the service life of the asphalt pavement is greatly influenced.
When the newly-built asphalt pavement is used for paving asphalt, the problem of high proportion of the area with insufficient thickness easily occurs due to factors such as poor flatness of the top surface of the base layer, poor adjustment of paving equipment in the construction process and the like. Due to the factors that the flatness of the top surface of the base layer is poor, the adjustment of paving equipment is not good in the paving construction process and the like, a weak area with insufficient thickness of the asphalt layer is easy to appear in the newly-built asphalt pavement, and the construction quality problems that the qualified rate of thickness distribution does not reach the standard and the like are caused.
In practice, the paving is usually carried out according to a design value, and whether the paving thickness meets the specification or not is manually checked in real time in the paving process, so that the following problems exist:
1. the manual real-time inspection of the paving thickness is inconvenient to operate and large in workload, and the measurement results are greatly different due to the change of factors such as people and environment; most importantly, the number of sample points obtained by the manual method is too small, the average value of thicknesses measured at 2-3 point positions can be generally taken as a representative value in one section, and the data is not very representative, so that the accuracy rate of detection results is low.
2. The upper layer asphalt paving thickness engineering application generally directly adopts a design value, so that the situation that a weak area possibly exists in an actual lower layer is not met, and the asphalt paving thickness can be too thick to influence the overall strength of a road and the engineering economy.
The invention content is as follows:
the invention aims to solve the problems of inconvenient operation and large workload in manual real-time paving thickness inspection and the problems of low accuracy and poor representativeness of detection results.
A method for dynamically adjusting the thickness of an asphalt pavement based on a three-dimensional ground penetrating radar comprises the following steps:
step 1: collecting a road width full-section three-dimensional data dot matrix, namely three-dimensional ground penetrating radar data, by using a three-dimensional ground penetrating radar system;
step 2: identifying and tracking lower-layer asphalt surface continuous signals and asphalt layer bottom continuous signals in radar images, and calculating to obtain asphalt pavement thickness so as to obtain an asphalt pavement thickness data set di；
And step 3: the asphalt pavement is divided into paving adjustment units, and a thickness data set d is utilizediCalculating the thickness average value of each unit
Figure BDA0003467176220000011
Based on the design value d of the thickness of the lower layer asphalt layerdObtaining a thickness compensation value delta d based on the requirement of the standard thickness representative valuesAnd based on the minimum value d of the thickness of the lower layer asphalt layerdmObtaining a thickness compensation value delta d based on the minimum value requirement of the standard thickness of standard acceptancem；
And 4, step 4: according to Δ ds、ΔdmAnd design value d of upper asphalt layer thicknessusDetermining the thickness adjustment value d of the upper asphalt layeruAnd further adjusting the value d according to the thickness of the upper asphalt layeruAnd determining a unit upper layer paving thickness adjusting value D.
Further, in step 2, before identifying the continuous signal of the asphalt surface of the lower layer and the continuous signal of the asphalt bottom in the tracking radar image, the three-dimensional ground penetrating radar data needs to be subjected to memorial preprocessing, and the preprocessing process comprises the following steps:
the method comprises the steps of firstly, exporting three-dimensional ground penetrating radar data from acquisition software, and then carrying out time-frequency conversion, ground line straightening, filtering, gain and background removal processing on the three-dimensional ground penetrating radar data by utilizing radar information processing software 3 drExaminer.
Further, the asphalt pavement is divided into 200m paving adjustment units when the paving adjustment units are divided.
Further, based on the thickness design value d of the lower asphalt layerdObtaining a thickness compensation value delta d based on the requirement of the standard thickness representative valuesThe process of (2) is as follows:
Figure BDA0003467176220000021
in the formula,. DELTA.dsA thickness compensation value required based on the thickness representative value; ddThe thickness design value of the lower asphalt layer is obtained; delta1Allowing deviation for the representative value of the total thickness of the asphalt layers; dtDesigning a value for the total thickness of the asphalt layer;
Figure BDA0003467176220000022
is the average thickness of the lower asphalt layer.
Further, based on the minimum value d of the thickness of the lower asphalt layerdmObtaining a thickness compensation value delta d based on the minimum value requirement of the standard thickness of standard acceptancemThe process of (2) is as follows:
Δdm＝dd-δ2×dt-ddm (2)
in the formula,. DELTA.dmThe thickness compensation value is based on the requirement of the minimum thickness value; ddThe thickness design value of the lower asphalt layer is obtained; delta2Allowing deviation for the minimum value of the total thickness of the asphalt layer; dtDesigning a value for the total thickness of the asphalt layer; ddmIs the minimum value of the thickness of the lower asphalt layer.
Further, step 4 is based on Δ ds、ΔdmAnd design value d of upper asphalt layer thicknessusDetermining the thickness adjustment value d of the upper asphalt layeruComprises the following steps:
first, an upper layer thickness compensation value satisfying both the thickness representative value and the thickness minimum value is calculated:
Δd＝max(Δds，Δdm) (3)
in the formula, delta d is a thickness compensation value; Δ dsA thickness compensation value required based on the thickness representative value; Δ dmThe thickness compensation value is based on the requirement of the minimum thickness value;
then, an upper layer thickness adjustment value satisfying both the thickness representative value and the thickness minimum value is calculated:
du＝max(Δd+dus，dus) (4)
in the formula (d)uAdjusting the value of the upper layer thickness of the asphalt pavement; Δ d is a thickness compensation value; dusThe thickness is designed for the upper asphalt layer.
Further, the value d is adjusted according to the thickness of the upper asphalt layer in the step 4uThe process of determining the unit upper layer paving thickness adjustment value D includes the steps of:
D＝K×du (5)
in the formula, D is a unit upper layer paving thickness adjusting value; k is a loose paving coefficient adopted by paving construction; duThe value is adjusted for the upper layer thickness of the asphalt pavement.
The invention has the beneficial effects that:
the invention relates to a method for dynamically adjusting the thickness of an asphalt pavement based on a three-dimensional ground penetrating radar, which is completely different from the prior art, and has the key points of realizing the dynamic adjustment of the thickness of the asphalt pavement, innovatively dividing the asphalt pavement into paving adjustment units, and obtaining an upper-layer paving thickness compensation value by using equations (1) to (5).
Meanwhile, the invention realizes dynamic adjustment based on the three-dimensional ground penetrating radar, and can effectively overcome the defects of narrow range, general representativeness, difficult autonomous calibration of the dielectric constant of the pavement material and the like when the two-dimensional ground penetrating radar measures the thickness of the asphalt pavement. The three-dimensional ground penetrating radar is applied to asphalt pavement thickness detection, full-section scanning can be achieved by adopting the multi-channel antenna, the method is a new means suitable for carrying out large-area pavement thickness rapid nondestructive testing, and the detection accuracy can be greatly improved.
Description of the drawings:
FIG. 1 is a flow chart of a method for dynamically adjusting the thickness of an asphalt pavement based on a three-dimensional ground penetrating radar.
The specific implementation mode is as follows:
in order that the objects, aspects and advantages of the invention will become more apparent, the invention will be described by way of example only, and in connection with the accompanying drawings. It is to be understood that such description is merely illustrative and not intended to limit the scope of the present invention. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present invention.
It should be noted that, in order to avoid obscuring the present invention with unnecessary details, only the structures and/or processing steps closely related to the scheme according to the present invention are shown in the drawings, and other details not so relevant to the present invention are omitted.
The first embodiment is as follows: the present embodiment is described in connection with figure 1,
the method for dynamically adjusting the thickness of the asphalt pavement based on the three-dimensional ground penetrating radar comprises the following steps:
step 1: selecting, installing and preparing the three-dimensional ground penetrating radar, wherein a frequency stepping radar is adopted in the embodiment; after the preparation is finished, performing radar nondestructive detection on the lower asphalt layer of the asphalt pavement to be detected, namely acquiring a road width full-section three-dimensional data dot matrix, namely three-dimensional ground penetrating radar data, by using a three-dimensional ground penetrating radar system; the data for the three latitudes are: longitudinal section data with the travelling direction as an x axis and the depth direction as a z axis; the transverse section data with the direction vertical to the driving direction as the y axis and the depth direction as the z axis; the driving direction is an x axis, and the driving direction vertical direction is horizontal tangent plane data under each depth of a y axis;
step 2: three-dimensional ground penetrating radar data are derived from acquisition software, time-frequency conversion, ground line straightening, filtering, gain and background removal processing are carried out on the three-dimensional ground penetrating radar data by utilizing radar information processing software 3drExaminer, the influence of interference, clutter and multiple waves in original signals is removed, lower-layer asphalt surface continuous signals and asphalt layer bottom continuous signals in radar images are identified and tracked, the thickness of the asphalt pavement is calculated, and then an asphalt pavement thickness data set d is obtainedi；
The identification and tracking of the lower-layer asphalt surface continuous signals and the asphalt layer bottom continuous signals in the radar images are realized based on the functions of radar information processing software, and the horizon signal identification is carried out through an edge detection algorithm, so that the identification and tracking of the lower-layer asphalt surface continuous signals and the asphalt layer bottom continuous signals in the radar images are realized. The thickness data is obtained by subtracting the depth coordinate of the upper layer signal from the depth coordinate of the lower layer continuous signal according to the layer position identification result, determining the thickness among the layers, and counting each point to obtain a layer thickness data set; the invention only needs thickness data of two layers (the thickness of a lower layer asphalt layer and the thickness of an upper layer asphalt layer), has no special requirement on measuring points, and only needs to ensure that the thickness of the pavement is uniform and continuous.
And step 3: according to the requirements of construction quality and economy, the asphalt pavement is divided into 200m paving adjustment units, and a thickness data set d is utilizediCalculating the thickness average value of each unit
Figure BDA0003467176220000041
Meanwhile, the design values d are respectively based on the thickness of the lower asphalt layerdMinimum thickness d of lower asphalt layerdmCalculating a thickness compensation value delta d based on the requirement of the standard thickness representative valuesA thickness compensation value delta dm required by the minimum thickness value; design value d of the thickness of the lower layer asphalt layerdAnd a minimum value ddmIs a standard value given in the engineering construction design book;
calculating a thickness compensation value based on the standard thickness representative value requirement of specification acceptance:
Figure BDA0003467176220000042
in the formula,. DELTA.dsA thickness compensation value required based on the thickness representative value; ddThe thickness design value of the lower asphalt layer is obtained; delta1Allowing deviation for the representative value of the total thickness of the asphalt layers; dtDesigning a value for the total thickness of the asphalt layer;
Figure BDA0003467176220000043
is the average thickness of the lower asphalt layer.
Calculating a thickness compensation value based on the minimum value requirement of the standard thickness of the specification acceptance:
Δdm＝dd-δ2×dt-ddm (2)
in the formula,. DELTA.dmThe thickness compensation value is based on the requirement of the minimum thickness value; ddThe thickness design value of the lower asphalt layer is obtained; delta2Allowing deviation for the minimum value of the total thickness of the asphalt layer; dtDesigning a value for the total thickness of the asphalt layer; ddmIs the minimum value of the thickness of the lower asphalt layer.
And 4, step 4: according to Δ ds、ΔdmAnd design value d of upper asphalt layer thicknessusDetermining the thickness adjustment value d of the upper asphalt layeruAnd further determining a unit upper layer paving thickness adjusting value D.
Calculating an upper layer thickness compensation value satisfying both the thickness representative value and the thickness minimum value:
Δd＝max(Δds，Δdm) (3)
in the formula, delta d is a thickness compensation value; Δ dsA thickness compensation value required based on the thickness representative value; Δ dmIs a thickness compensation value based on the thickness minimum value requirement.
Calculating an upper layer thickness adjustment value satisfying both the thickness representative value and the thickness minimum value:
du＝max(Δd+dus，dus) (4)
in the formula (d)uAdjusting the value of the upper layer thickness of the asphalt pavement; Δ d is a thickness compensation value; dusThe thickness is designed for the upper asphalt layer.
Determining the adjustment value of the unit upper layer paving thickness according to the upper layer paving loosening coefficient:
D＝K×du (5)
in the formula, D is a unit upper layer paving thickness adjusting value; k is a loose paving coefficient adopted by paving construction and is determined according to the type of a mixture and a compaction process; duThe value is adjusted for the upper layer thickness of the asphalt pavement.
Examples
The design of a newly-built expressway requires that the total thickness representative value allowable deviation of an asphalt layer is 0.9cm, namely, the total thickness representative value allowable deviation is required to be more than 17.1 cm; the deviation of the total thickness of the asphalt layer at a single detection point is allowed to be 1.8cm (10%), namely, more than 16.2cm is required. After the middle-surface layer construction is finished, the upper-surface layer construction thickness is adjusted, and the loose paving coefficient of the upper-surface layer mixture paving is 1.24.
And (3) before and after the upper layer is paved, three-dimensional ground penetrating radar is adopted to detect the thickness of the asphalt layer on the paragraphs with the right width of K0+ 000-K5 +000 and the total length of 6 km. And (3) adjusting the upper layer construction thickness by adopting a construction thickness dynamic adjustment technology, wherein the length of a road section is 6km, and the road section is divided into 30 sections of units with the number of 1-30. Taking the calculation of a certain unit as an example, the calculation results are as follows:
Figure BDA0003467176220000051
the foregoing shows and describes the general principles and broad features of the present invention and advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims (7)

1. A method for dynamically adjusting the thickness of an asphalt pavement based on a three-dimensional ground penetrating radar is characterized by comprising the following steps:
step 1: collecting a road width full-section three-dimensional data dot matrix, namely three-dimensional ground penetrating radar data, by using a three-dimensional ground penetrating radar system;
step 2: identifying and tracking lower-layer asphalt surface continuous signals and asphalt layer bottom continuous signals in radar images, and calculating to obtain asphalt pavement thickness so as to obtain an asphalt pavement thickness data set di；
And step 3: the asphalt pavement is divided into paving adjustment units, and a thickness data set d is utilizediCalculating the thickness average value of each unit
Figure FDA0003467176210000011
Based on the design value d of the thickness of the lower layer asphalt layerdObtaining a thickness compensation value delta d based on the requirement of the standard thickness representative valuesAnd based on the minimum value d of the thickness of the lower layer asphalt layerdmObtaining a thickness compensation value delta d based on the minimum value requirement of the standard thickness of standard acceptancem；
And 4, step 4: according to Δ ds、ΔdmAnd design value d of upper asphalt layer thicknessusDetermining the thickness adjustment value d of the upper asphalt layeruAnd further adjusting the value d according to the thickness of the upper asphalt layeruAnd determining a unit upper layer paving thickness adjusting value D.
2. The method for dynamically adjusting the thickness of the asphalt pavement based on the three-dimensional ground penetrating radar as claimed in claim 1, wherein in step 2, before the lower asphalt surface continuous signal and the asphalt layer bottom continuous signal in the tracking radar image are identified, the three-dimensional ground penetrating radar data needs to be processed in a memorable manner, and the processing procedure of the preprocessing comprises the following steps:
the method comprises the steps of firstly, exporting three-dimensional ground penetrating radar data from acquisition software, and then carrying out time-frequency conversion, ground line straightening, filtering, gain and background removal processing on the three-dimensional ground penetrating radar data by utilizing radar information processing software 3 drExaminer.
3. The method for dynamically adjusting the thickness of the asphalt pavement based on the three-dimensional ground penetrating radar as claimed in claim 2, wherein the asphalt pavement is divided into 200m paving adjustment units when the paving adjustment units are divided.
4. The method for dynamically adjusting the thickness of the asphalt pavement based on the three-dimensional ground penetrating radar as claimed in claim 1, 2 or 3, wherein the method is based on a design value d of the thickness of the lower asphalt layerdObtaining a thickness compensation value delta d based on the requirement of the standard thickness representative valuesThe process of (2) is as follows:
Figure FDA0003467176210000012
in the formula,. DELTA.dsA thickness compensation value required based on the thickness representative value; ddThe thickness design value of the lower asphalt layer is obtained; delta1Allowing deviation for the representative value of the total thickness of the asphalt layers; dtDesigning a value for the total thickness of the asphalt layer;
Figure FDA0003467176210000013
is the average thickness of the lower asphalt layer.
5. The method for dynamically adjusting the thickness of the asphalt pavement based on the three-dimensional ground penetrating radar as claimed in claim 4, wherein the method is based on the minimum value d of the thickness of the lower asphalt layerdmObtaining a thickness compensation value delta d based on the minimum value requirement of the standard thickness of standard acceptancemThe process of (2) is as follows:
Δdm＝dd-δ2×dt-ddm (2)
in the formula,. DELTA.dmThe thickness compensation value is based on the requirement of the minimum thickness value; ddThe thickness design value of the lower asphalt layer is obtained; delta2Allowing deviation for the minimum value of the total thickness of the asphalt layer; dtDesigning a value for the total thickness of the asphalt layer; ddmIs the minimum value of the thickness of the lower asphalt layer.
6. The method for dynamically adjusting the thickness of the asphalt pavement based on the three-dimensional ground penetrating radar as claimed in claim 5, wherein the step 4 is based on Δ ds、ΔdmAnd design value d of upper asphalt layer thicknessusDetermining the thickness adjustment value d of the upper asphalt layeruComprises the following steps:
first, an upper layer thickness compensation value satisfying both the thickness representative value and the thickness minimum value is calculated:
Δd＝max(Δds，Δdm) (3)
in the formula, delta d is a thickness compensation value; Δ dsA thickness compensation value required based on the thickness representative value; Δ dmThe thickness compensation value is based on the requirement of the minimum thickness value;
then, an upper layer thickness adjustment value satisfying both the thickness representative value and the thickness minimum value is calculated:
du＝max(Δd+dus，dus) (4)
in the formula (d)uAdjusting the value of the upper layer thickness of the asphalt pavement; Δ d is a thickness compensation value; dusThe thickness is designed for the upper asphalt layer.
7. The method for dynamically adjusting the thickness of the asphalt pavement based on the three-dimensional ground penetrating radar as claimed in claim 6, wherein the step 4 is to adjust the value d according to the thickness of the upper asphalt layeruThe process of determining the unit upper layer paving thickness adjustment value D includes the steps of:
D＝K×du (5)
in the formula, D is a unit upper layer paving thickness adjusting value; k is a loose paving coefficient adopted by paving construction; duThe value is adjusted for the upper layer thickness of the asphalt pavement.
CN202210032782.1A 2022-01-12 2022-01-12 Dynamic asphalt pavement thickness adjusting method based on three-dimensional ground penetrating radar Pending CN114397656A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116008516A (en) * 2023-02-21 2023-04-25 哈尔滨工业大学 Asphalt pavement compaction critical threshold determining method based on intelligent aggregate

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116008516A (en) * 2023-02-21 2023-04-25 哈尔滨工业大学 Asphalt pavement compaction critical threshold determining method based on intelligent aggregate

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