CN113638296B - Method for determining interlayer milling depth of composite pavement - Google Patents
Method for determining interlayer milling depth of composite pavement Download PDFInfo
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- CN113638296B CN113638296B CN202110958204.6A CN202110958204A CN113638296B CN 113638296 B CN113638296 B CN 113638296B CN 202110958204 A CN202110958204 A CN 202110958204A CN 113638296 B CN113638296 B CN 113638296B
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- 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
- E01C23/06—Devices or arrangements for working the finished surface; Devices for repairing or reconditioning the surface of damaged paving; Recycling in place or on the road
- E01C23/08—Devices or arrangements for working the finished surface; Devices for repairing or reconditioning the surface of damaged paving; Recycling in place or on the road for roughening or patterning; for removing the surface down to a predetermined depth high spots or material bonded to the surface, e.g. markings; for maintaining earth roads, clay courts or like surfaces by means of surface working tools, e.g. scarifiers, levelling blades
- E01C23/085—Devices or arrangements for working the finished surface; Devices for repairing or reconditioning the surface of damaged paving; Recycling in place or on the road for roughening or patterning; for removing the surface down to a predetermined depth high spots or material bonded to the surface, e.g. markings; for maintaining earth roads, clay courts or like surfaces by means of surface working tools, e.g. scarifiers, levelling blades using power-driven tools, e.g. vibratory tools
- E01C23/088—Rotary tools, e.g. milling drums
Abstract
The invention relates to a method for determining the milling depth between layers of a composite pavement, which comprises the following steps of determining the material of a lower layer of asphalt of the composite pavementType-determining reference milling depth h 0 (ii) a Determining the thickness correction coefficient k of the asphalt surface layer according to the total thickness of the asphalt surface layer of the composite pavement ha (ii) a Determining a longitudinal slope correction coefficient k according to the maximum longitudinal slope of the designed road section i (ii) a Determining a curve radius correction coefficient k according to the minimum curve radius of the designed road section r (ii) a Determining an axle load correction coefficient k according to the maximum axle load obtained by early-stage traffic investigation p (ii) a The influence of the thickness, the longitudinal slope, the curve radius and the axle load of the asphalt surface layer is considered, the reference milling depth is corrected, and the milling depth h between the composite pavement layers under different working conditions is determined according to the reference milling depth x . The method of the invention considers various internal and external factors, can accurately determine the milling depth between the layers of the composite pavement under different working conditions, can effectively solve the problem that the roughening treatment construction between the layers of the composite pavement is not based on the principle, and has great engineering practical value.
Description
Technical Field
The invention belongs to the technical field of road engineering, and particularly relates to a method for determining the interlayer milling depth of a composite pavement.
Background
The composite pavement is a pavement with a surface layer formed by compounding two structural layers with different material types and mechanical properties, and the common structure is the composition of common concrete, roller compacted concrete, lean concrete or continuous reinforced concrete and an asphalt concrete surface layer. The composite pavement is widely applied to urban roads and highways due to the characteristics of rigidity, flexibility and suitability for heavy-load traffic.
The cement concrete layer and the asphalt layer of the composite pavement have different material characteristics, larger modulus difference and poor deformation coordination, so that the stiffness modulus of the asphalt material is reduced, the cohesive force is reduced, the shear strength is reduced under the action of high temperature and vehicle load, and the asphalt layer, particularly an interlayer joint surface, is easy to have the defects of slippage, cracking, deformation and the like caused by insufficient interlayer shear strength. In order to improve the shear strength between the composite pavement layers in the engineering, besides spreading the viscous layer oil or setting the waterproof adhesive layer between the layers, the surface of the cement concrete is usually milled and milled. The core parameter of milling processing is milling depth, the milling depth of the current standard milling process is 0-300 mm, and the milling depth of the finish milling process is 0-100 mm. The current composite pavement interlayer milling technology (CN202110133637.8, CN202010873866.9, CN201821269205.X and CN201310088890.1) does not need to provide corresponding milling depth requirements for different working conditions, the ultra-shallow milling between the composite pavement layers has limited bonding effect on the layers, the ultra-deep milling causes damage to a cement concrete structure, and meanwhile, the requirements of the composite pavement on the shearing resistance between the layers under different working conditions are different, namely the requirements on the milling depth are different, so that the problem of determining the proper milling depth according to different working conditions is the technical field of interlayer treatment of the current composite pavement.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a method for determining the interlayer milling depth of a composite pavement, aiming at the defects in the prior art, the method not only can solve the problem that the existing specification does not have interlayer milling processing control parameters aiming at different working conditions, but also can fill the blank of the existing specification on the interlayer treatment design of the composite pavement, and the determined calculation formula of the interlayer milling depth of the composite pavement can be used for guiding the design and has important significance for scientifically and reasonably designing the composite pavement.
The technical scheme adopted by the invention for solving the technical problems is as follows:
a method for determining the milling depth between layers of a composite pavement comprises the following steps:
s1, determining the reference milling depth according to the material type of the asphalt lower surface layer of the composite pavementh 0 ；
S2, determining the thickness correction coefficient k of the asphalt surface layer according to the total thickness of the asphalt surface layer of the composite pavement ha ；
S3, determining a longitudinal slope correction coefficient k according to the maximum longitudinal slope of the designed road section i ；
S4, determining a curve radius correction coefficient k according to the minimum curve radius of the designed road section r ；
S5, determining an axle load correction coefficient k according to the maximum axle load obtained by the early-stage traffic investigation p ；
S6, correcting the reference milling depth by considering the influences of the thickness, the longitudinal slope, the curve radius and the axle load of the asphalt surface layer, and determining the milling depth h between the composite pavement layers under different working conditions x 。
In the above scheme, in step S1, the reference milling depth h 0 Taking the nominal maximum grain diameter R of the aggregate of the lower surface layer of the asphalt m 1/3-1/2.
In the above scheme, in step S2, according to the total thickness of the asphalt surface layer of the composite pavement and the thickness correction coefficient k of the asphalt surface layer ha The calculation formula of (2) is as follows:
k ha ＝0.003h a 2 -0.1061h a +1.3734 (1)
in the formula, h a -total thickness of asphalt overlay, cm.
In the above scheme, in step S3, when the maximum longitudinal slope of the designed link is less than or equal to 3%, the longitudinal slope correction is not performed.
In the above-described embodiment, in step S3, the longitudinal slope correction coefficient k is determined according to the maximum longitudinal slope used for the designed link i The calculation formula of (2):
k i ＝0.7596e 0.0828i (2)
in the formula: i-maximum longitudinal slope of designed road section,%.
In the above-described embodiment, in step S4, when the minimum curve radius of the designed link is equal to or greater than 250m, the curve radius correction is not performed.
In the above-mentioned scheme, in step S4, the minimum curve radius is adopted according to the designed road sectionCurve radius correction factor k r The calculation formula of (2):
k r ＝-0.163ln(r)+1.9118 (3)
in the formula: r-minimum curve radius of the designed road section, m.
In the above scheme, in step S5, when the maximum axle load of the designed road segment is less than or equal to 100kN, the axle load is not corrected.
In the above scheme, in step S5, the axle load correction coefficient k is corrected according to the maximum axle load obtained from the traffic survey p The calculation formula of (2):
k p ＝0.6372e 0.0042p (4)
in the formula: p-maximum axle load, kN.
In the above scheme, in step S6, the influence of the thickness, the longitudinal slope, the curve radius and the axle load of the asphalt surface layer is considered, and the milling depth h between the composite pavement layers under different working conditions is considered x The calculation formula of (2):
h x ＝k ha ·k i ·k r ·k p ·h 0 (5)。
the invention has the beneficial effects that:
1. the invention provides a method for determining the milling depth between layers of a composite pavement, which not only solves the problem that the prior specification does not have milling processing control parameters between the layers of the composite pavement aiming at different working conditions, but also fills the blank of the prior specification on the treatment design between the layers of the composite pavement, and the determined calculation formula of the milling depth between the layers of the composite pavement can be used for guiding the design, can effectively solve the problem that the roughening processing construction between the layers of the composite pavement is not based on the criterion, and has great engineering practical value.
2. In the derivation process of the computational formula, a mode of combining finite element analysis and indoor oblique shearing test is adopted, a large amount of test and theoretical data are collected, the sensitivity of each influence factor and the significance of the influence level are judged through range analysis and significance evaluation, and field torsional shearing test verification is carried out in the physical engineering.
3. The method has the advantages of simple steps and clear formula, fully considers various internal and external factors, can accurately determine the milling depth between the composite pavement layers under different working conditions, and has higher calculation precision.
Drawings
The invention will be further described with reference to the accompanying drawings and examples, in which:
fig. 1 is a flowchart of the method for determining the milling depth between layers of the composite pavement according to the present invention.
Detailed Description
For a more clear understanding of the technical features, objects and effects of the present invention, embodiments of the present invention will now be described in detail with reference to the accompanying drawings.
The temperature change can affect the modulus of the asphalt mixture, and the interlayer bonding capacity of the composite pavement is remarkably affected by the modulus change of the asphalt layer, the thickness of the asphalt layer, the road line shape (longitudinal slope and curve radius), the maximum axle load of vehicles and other factors. Therefore, under different working conditions, the requirements of the composite pavement on interlayer bonding capacity are different, and the interlayer bonding requirements can be met by correspondingly adopting different milling depths.
In order to achieve the above object, the present invention provides a method for determining milling depth between layers of a composite pavement, as shown in fig. 1, the method including the following steps:
s1, determining the reference milling depth h according to the material type of the asphalt lower surface layer of the composite pavement 0 。
The material types of the asphalt lower surface layer of the composite pavement comprise AC-25, AC-20, AC-16, SMA-16, AC-13, SMA-13 and the like, in order to avoid complete 'point contact' of aggregate edges and corners in the asphalt mixture and the cement concrete layer, ensure that the aggregate and the milled groove surface of the cement concrete plate surface form an embedding and extruding effect, and the indoor test shows that the milling depth is 1/3-1/2 of the nominal maximum particle size of the aggregate contacted with the aggregate, and the bonding strength between the cement concrete layer and the asphalt layer material is at the momentThe highest level. Reference milling depth h allows for minimizing the impact of milling on the strength and integrity of the cementitious concrete panel 0 Taking the nominal maximum grain diameter R of the aggregate of the lower surface layer of the asphalt m 1/3 of (1).
S2, determining the thickness correction coefficient k of the asphalt surface layer according to the total thickness of the asphalt surface layer of the composite pavement ha 。
The composite pavement asphalt surface layer has a single-layer or double-layer structure, and generally has a structure combination design type of 4cmAC-13, 6cmAC-16, 6cmSMA-16, 5cmSMA-16+4cmSMA-13, 5cmAC-16+4cmAC-13, 6cmAC-20+4cmSMA-13, 8cmAC-25+4cmAC-13, 8cmAC-25+4cmSMA-13 and the like, and the total thickness range of the asphalt surface layer is generally 4-12 cm.
The total thickness of the asphalt surface layer of the composite pavement can influence the diffusion range of the horizontal force between layers, finite element numerical analysis is carried out according to the total thickness of different asphalt surface layers to obtain the maximum shearing stress value between layers under the condition of different thicknesses, the bonding strength between layers is tested by adopting an indoor oblique shearing test, the thickness of a test piece is adjusted to simulate the thickness condition of different asphalt surface layers, the maximum shearing stress value level between layers is reversely verified, and the total thickness correction coefficient k of the asphalt surface layer can be obtained after the numerical calculation result after the indoor test correction is fitted ha The calculation formula of (2):
k ha ＝0.003h a 2 -0.1061h a +1.3734 (1)
in the formula, h a -total thickness of asphalt overlay, cm.
S3, determining a longitudinal slope correction coefficient k according to the maximum longitudinal slope of the designed road section i 。
The maximum longitudinal slope of the road has different design requirements along with different road grades and design speeds, the range is usually between 3% and 8%, when the maximum longitudinal slope is less than or equal to 3%, the change of the longitudinal horizontal force coefficient is small, and longitudinal slope correction can be omitted.
Longitudinal slope change mainly affects longitudinal horizontal force coefficient, finite element numerical analysis is carried out according to the longitudinal horizontal force coefficient corresponding to the maximum longitudinal slope to obtain interlayer maximum shear stress values under different longitudinal slope conditions, an indoor oblique shear test is adopted to test interlayer bonding strength, and adjustment is carried out to obtain interlayer bonding strengthSimulating different longitudinal slope conditions by oblique shearing angles, further reversely verifying the maximum interlayer shearing stress value level, and obtaining a longitudinal slope correction coefficient k after fitting numerical calculation results corrected by indoor tests i The calculation formula of (2):
k i ＝0.7596e 0.0828i (2)
in the formula: i-maximum longitudinal slope of designed road section,%.
S4, determining a curve radius correction coefficient k according to the minimum curve radius of the designed road section r 。
The minimum curve radius of the road has different design requirements along with the difference of the road grade and the design speed, the range is usually between 40m and 650m, when the minimum curve radius is larger than or equal to 250m, the transverse horizontal force coefficient is basically stable, and the curve radius correction can not be carried out.
Determining the distribution of transverse horizontal force by curve radius, carrying out finite element numerical analysis according to the transverse horizontal force coefficient corresponding to the minimum curve radius to obtain the maximum interlayer shear stress value under different curve radius conditions, testing the interlayer bonding strength by adopting an indoor oblique shear test, simulating different curve radius conditions by adjusting an oblique shear angle, further reversely verifying the maximum interlayer shear stress value level, and obtaining the minimum curve radius correction coefficient k after fitting the numerical calculation result corrected by the indoor test r The calculation formula of (2):
k r ＝-0.163ln(r)+1.9118 (3)
in the formula: r-minimum curve radius of the designed road section, m.
S5, determining an axle load correction coefficient k according to the maximum axle load obtained by the early-stage traffic investigation p 。
According to the maximum axle load which is possibly passed through the designed road section and obtained through traffic survey, when the maximum axle load is less than or equal to 100kN, the conversion standard axle load accumulative action times are small, and axle load correction can be omitted.
The maximum axle load directly determines the magnitude of the horizontal force component, finite element numerical analysis is carried out according to the horizontal force corresponding to the maximum axle load to obtain the maximum interlayer shear stress value under different axle loads, and an indoor oblique shear test is adopted to test the layerThe interlayer adhesion strength is simulated by adjusting the maximum breaking load to simulate different axle load conditions, the maximum shear stress value level between layers is verified reversely, and the maximum axle load correction coefficient k can be obtained after fitting the numerical calculation result corrected by the indoor test p The calculation formula of (2):
k p ＝0.6372e 0.0042p (4)
in the formula: p-maximum axle load, kN.
S6, correcting the reference milling depth by considering the influences of the thickness, the longitudinal slope, the curve radius and the axle load of the asphalt surface layer, and determining the milling depth h between the composite pavement layers under different working conditions x ，h x The calculation formula of (2):
h x ＝k ha ·k i ·k r ·k p ·h 0 (5)
the above-mentioned method of the present invention is specifically explained below with reference to specific examples.
A secondary trunk road of a certain city adopts a cement concrete and asphalt concrete composite road surface, the structural combination of an asphalt surface layer is 6cmAC-20+4cm AC-13, the design speed is 40km/h, the maximum longitudinal slope adopted by a designed road section is 4%, the minimum curve radius is 150m, and the maximum axle load obtained according to traffic investigation is 150 kN. The method for determining the milling depth between the layers of the composite pavement comprises the following steps:
the method comprises the following steps: determining a reference milling depth based on a material type of a sub-asphalt layer of a composite pavement
The material type of the asphalt lower surface layer of the project composite pavement is AC-20, and the nominal maximum grain diameter R of the asphalt lower surface layer m Is 19mm, the reference milling depth h 0 ＝R m /3＝6.33mm。
Step two: determining the thickness correction coefficient of the asphalt surface layer according to the total thickness of the asphalt surface layer of the composite pavement
The total thickness of the asphalt surface layer of the project composite pavement is 10cm, and the thickness correction coefficient of the asphalt surface layer is calculated according to a calculation formula:
k ha ＝0.003h a 2 -0.1061h a +1.3734＝0.003×10 2 -0.1061×10+1.3734＝0.612
step three: according to the maximum longitudinal slope 4% of the designed road section, determining a longitudinal slope correction coefficient:
k i ＝0.7596e 0.0828i ＝0.7596e (0.0828×4) ＝1.058
step four: determining a curve radius correction coefficient according to the minimum curve radius 150m of the designed road section:
k r ＝-0.163ln(r)+1.9118＝-0.163ln(150)+1.9118＝1.095
step five: determining an axle load correction coefficient according to the maximum axle load of 150kN obtained by early-stage traffic survey:
k p ＝0.6372e 0.0042p ＝0.6372e (0.0042×150) ＝1.196
step six: considering the influences of the thickness, the longitudinal slope, the curve radius and the axle load of the asphalt surface layer, correcting the reference milling depth, and determining the milling depth between the composite pavement layers under different working conditions:
h x ＝k ha ·k i ·k r ·k p ·h 0 ＝0.612×1.058×1.095×1.196×6.33＝5.4mm
therefore, under the determined working condition, the depth of the composite pavement layer milling of the project is 5.4 mm.
In order to verify the effectiveness of the method, the interlayer bonding strength of the composite pavement interlayer of the project at different milling depths is tested by adopting a field torsional shear test, and the result is as follows:
| depth of milling and planing | Representative value of interlayer adhesion Strength (MPa) | Calculating the maximum shear stress (MPa) between layers |
| 0mm | 0.23 | 0.28 |
| 4mm | 0.26 | 0.28 |
| 5.4mm | 0.29 | 0.28 |
The results are compared, so that the method can effectively determine the appropriate milling depth for treating the composite pavement interlayer under different working conditions, ensure that the interlayer bonding strength is greater than the maximum shearing stress of the calculated interlayer, and avoid the composite pavement from diseases such as interlayer slippage, cracking, deformation and the like.
While the present invention has been described with reference to the embodiments shown in the drawings, the present invention is not limited to the embodiments, which are illustrative and not restrictive, and it will be apparent to those skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (4)
1. A method for determining the milling depth between layers of a composite pavement is characterized by comprising the following steps:
s1, determining the reference milling depth h according to the material type of the asphalt lower surface layer of the composite pavement 0 (ii) a The reference milling depth h 0 Taking the nominal maximum grain diameter R of the aggregate of the lower surface layer of the asphalt m 1/3-1/2;
s2, determining the thickness correction coefficient k of the asphalt surface layer according to the total thickness of the asphalt surface layer of the composite pavement ha (ii) a Correction coefficient k of asphalt surface layer thickness ha Is calculated byThe formula is as follows:
k ha ＝0.003h a 2 -0.1061h a +1.3734 (1)
in the formula, h a -total thickness of asphalt pavement, cm;
s3, determining a longitudinal slope correction coefficient k according to the maximum longitudinal slope of the designed road section i (ii) a Longitudinal slope correction coefficient k i The calculation formula of (2):
k i ＝0.7596e 0.0828i (2)
in the formula: i-designing the maximum longitudinal slope of the road section,%;
s4, determining a curve radius correction coefficient k according to the minimum curve radius of the designed road section r (ii) a Curve radius correction factor k r The calculation formula of (2):
k r ＝-0.163ln(r)+1.9118 (3)
in the formula: r-minimum curve radius of the designed road section, m;
s5, determining an axle load correction coefficient k according to the maximum axle load obtained by the early-stage traffic investigation p (ii) a Coefficient k of axle load correction p The calculation formula of (2):
k p ＝0.6372e 0.0042p (4)
in the formula: p-maximum axle load, kN;
s6, correcting the reference milling depth by considering the influences of the thickness, the longitudinal slope, the curve radius and the axle load of the asphalt surface layer, and determining the milling depth h between the composite pavement layers under different working conditions x ，h x The calculation formula of (2):
h x ＝k ha ·k i ·k r ·k p ·h 0 (5)。
2. the method for determining the milling depth between the layers of the composite pavement as claimed in claim 1, wherein in step S3, when the maximum longitudinal slope of the designed road section is less than or equal to 3%, no longitudinal slope correction is performed.
3. The method for determining the milling depth between the layers of the composite pavement as claimed in claim 1, wherein in step S4, no curve radius correction is performed when the minimum curve radius of the designed road section is greater than or equal to 250 m.
4. The method for determining the milling depth between the layers of the composite pavement as claimed in claim 1, wherein in step S5, axle load correction is not performed when the maximum axle load of the designed road section is less than or equal to 100 kN.
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