CN107389477B - A kind of Layer Modulus of Asphalt Pavement reverse calculation algorithms - Google Patents
A kind of Layer Modulus of Asphalt Pavement reverse calculation algorithms Download PDFInfo
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- CN107389477B CN107389477B CN201710447146.4A CN201710447146A CN107389477B CN 107389477 B CN107389477 B CN 107389477B CN 201710447146 A CN201710447146 A CN 201710447146A CN 107389477 B CN107389477 B CN 107389477B
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/30—Investigating strength properties of solid materials by application of mechanical stress by applying a single impulsive force, e.g. by falling weight
- G01N3/303—Investigating strength properties of solid materials by application of mechanical stress by applying a single impulsive force, e.g. by falling weight generated only by free-falling weight
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- G—PHYSICS
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/003—Generation of the force
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Abstract
The present invention discloses a kind of Layer Modulus of Asphalt Pavement reverse calculation algorithms, it include: to simplify to the road surface structare layer of bituminous pavement, the identical road surface structare layer of adjacent and material type is considered as simplified layer, and soil matrix is individually considered as soil matrix layer no more than N MPa by the modulus difference between the structure sheaf that each simplification layer is included；Vertical strain sensor is arranged in soil matrix layer and each simplified layer, and all vertical strain sensors for guaranteeing that arrangement is completed are located at same vertical direction；It is further applied load on bituminous pavement surface layer, and the load is located at the surface of each vertical strain sensing, and soil matrix layer is acquired by vertical strain sensor and simplifies the vertical strain data of layer；Modular inverse calculation is carried out using collected vertical strain data as back-calculation parameter；The value of N is 250~350.Simplify original structure combination to optimize modular inverse calculation calculating process by this method, solves the technical problem that inverse modulus and virtual condition are not inconsistent.
Description
Fields
The present invention relates to a kind of Layer Modulus of Asphalt Pavement reverse calculation algorithms, belong to technical field of road engineering.
Background technique
Layer Modulus of Asphalt Pavement inverse is the important means of pavement structure performance evaluation, provides construction, maintenance for new-old pavement
Parameter.Current existing modular inverse calculation method is aided with certain mathematics optimizing means using FWD deflection basin as back-calculation parameter,
Be widely applied both at home and abroad, but there are many deficiencies: carrying out inverse with road surface deflection basin causes inverse modulus not to be inconsistent with practical modulus；
It is especially very big to the insensitive structure sheaf inverse result of displacement and practical gap.These deficiencies have seriously affected pavement structure
Maintenance evaluation.
Summary of the invention
For the deficiency of modular inverse calculation method in the prior art, the present invention provides a kind of Layer Modulus of Asphalt Pavement reverse calculation algorithms,
Using the vertical strain data of soil matrix layer and asphalt pavement structural layer as parameter, inverse is carried out to each pavement layer modulus of bituminous pavement.
To achieve the above object, the technical solution adopted by the present invention are as follows:
A kind of Layer Modulus of Asphalt Pavement reverse calculation algorithms disclosed in this invention, including following components: to bituminous pavement
Road surface structare layer is simplified, and the identical road surface structare layer of adjacent and material type is considered as one layer, that is, simplifies layer, and each
Simplify the modulus difference between the structure sheaf that layer is included no more than N MPa, soil matrix is individually considered as to one layer, i.e. soil matrix layer；?
Vertical strain sensor is arranged in soil matrix layer and each simplified layer, and it is same to guarantee that all vertical strain sensors of arrangement completion are located at
One vertical direction；It is further applied load on bituminous pavement surface layer, and the load is located at the surface of each vertical strain sensing, and by hanging down
Straight strain transducer acquisition soil matrix layer and the vertical strain data for simplifying layer；Join collected vertical strain data as inverse
Number carries out modular inverse calculation；The value of N is 250~350.
Further, the road surface structare layer of bituminous pavement is simplified, by with the material type of adjacent road surface structare layer not
With or with the material type of adjacent road surface structare layer is identical but road surface structare layer of the modulus difference greater than N MPa is individually considered as one
Layer.
Further, the value of N is 300.
Further, material type refers to the classification of the chemical component progress by material, the material type of the bituminous pavement
Including asphalt, stabilized with inorganic binder class mixture and pellet class.
Further, asphalt includes bituminous concrete mixture (AC), Asphalt Stabilized Macadam (ATB), the drip of more rubbles
Green concrete (SAC), bituminous concrete moxture (AM), drainage type asphalt wearing layer (OGFC), drainage type Asphalt Stabilized Macadam
(ATPB), stone mastic asphalt (SMA)；The stabilized with inorganic binder class mixture includes cement stabilized type, stone
Grey Stabilized and lime industrial residue Stabilized, wherein cement stabilized type includes that cement stabilized grading crushed stones (CBG), cement are steady
Fixed soil (CS)；The pellet class includes graded broken stone (GB), calking rubble.
It further, is single circle load in the load that bituminous pavement surface layer applies.
Further, it arranges that vertical strain sensor refers in soil matrix layer and each simplified layer to hang down in the layer top of soil matrix layer arrangement
Straight strain transducer sets vertical strain sensor in the layer base fabric for simplifying layer.
Further, collected vertical strain data include vertical strain data that soil matrix pushes up layer by layer and each simplification bottom layer by layer
Vertical strain data.
Further, modular inverse calculation is iterated inverse using artificial neural network algorithm or genetic algorithm.
The present invention has the advantages that compared with prior art
Compared with existing modular inverse calculation method, the present invention is based on disclosed structure sheaf simplification principles, by original road surface
Structure sheaf is combined simplification, modular inverse calculation is carried out using collected vertical strain data as back-calculation parameter, with road surface mechanics
Based on calculation procedure and it is aided with optimization algorithm modular inverse calculation method, is solved to optimize modular inverse calculation calculating process
The technical problem that inverse modulus and virtual condition are not inconsistent.
The present invention have studied using soil matrix top surface vertical strain and road surface respectively layer by layer bottom vertical strain as the reverse calculation algorithms of parameter,
The shortcomings that overcoming existing back-calculation parameter unification.
This method can be applied to the structural behaviour detection to heavy construction test section, full scale test road, can also be applied to pre-
The performance evaluation on the existing road surface of sensor is buried, there is good engineering value.
Detailed description of the invention
Fig. 1 is Layer Modulus of Asphalt Pavement reverse calculation algorithms flow chart shown in embodiment；
Fig. 2 is the sensor arrangement and load application position schematic diagram of asphalt pavement structure one；
Fig. 3 is the sensor arrangement and load application position schematic diagram of asphalt pavement structure two；
Fig. 4 is the modular inverse calculation program flow diagram in embodiment；
In figure: P0, L0 are respectively that the straight strain transducer of soil matrix roof pendant layer by layer of pavement structure one and pavement structure two is embedded
Position, P1, P2, P3 are each simplification straight strain transducer burial place of dolly layer by layer of pavement structure one, and L1, L2, L3 are road surface
The straight strain transducer burial place of dolly, P, L are respectively pavement structure one and pavement structure two layer by layer for each simplification of structure two
Single circle load application position.
Specific embodiment
The present invention discloses a kind of Layer Modulus of Asphalt Pavement reverse calculation algorithms, including following components:
First part: the road surface structare layer of bituminous pavement is simplified.
The principle that structure sheaf simplifies are as follows: the identical and adjacent road surface structare layer of material type is considered as one and simplifies layer, and
The modulus difference between structure sheaf that each simplification layer is included is no more than 300MPa；Soil matrix is individually considered as to one layer, i.e. soil matrix
Layer.Further, by and adjacent road surface structare layer material type it is different or with the material type of adjacent road surface structare layer it is identical but
Road surface structare layer of the modulus difference greater than NMPa is individually considered as one layer；
Under normal circumstances, adjacent bitumen layer is considered as one layer, adjacent semi-rigid layer is considered as one layer, it will be adjacent rigid
Property layer is considered as one layer；It will be unable to the structure sheaf merged with adjacent bitumen layer, semi-rigid layer or rigid layer and be individually considered as one layer.
It should be noted that: under normal conditions, the modulus size of structure sheaf depends on material type.Material type is
Refer to the classification carried out by the chemical component of material, including organic binder, inorganic binder and mixed binding material, wherein organic
Binder refers mainly to pitch class binder, and inorganic binder refers mainly to stabilized with inorganic binder mixture and grain material.This
Mainly for bituminous pavement, involved structural material type mainly includes asphalt type, inorganic combination for invention
Expect Stabilized mixture and pellet class, wherein asphalt type includes that bituminous concrete mixture (AC), Bituminous stabilized are broken
Stone (ATB), more rubble bituminous concretes (SAC), bituminous concrete moxture (AM), drainage type asphalt wearing layer (OGFC), draining
Formula Asphalt Stabilized Macadam (ATPB), stone mastic asphalt (SMA) etc.；Stabilized with inorganic binder class mixture includes water
Mud Stabilized, lime stabilization class and lime industrial residue Stabilized, wherein cement stabilized type includes cement stabilized grading crushed stones
(CBG), cement stabilized soil (CS)；Pellet class includes graded broken stone (GB), calking rubble.It therefore, can be by SAC layers, AC layers, SMA
Layer is considered as the identical bitumen layer of material type, and CBG layers, CS layers are considered as that material type is one layer identical, and GB layers are considered as one layer.
For each structure sheaf to the digital representative diameter size after the title material code answered, what it is such as AC10 expression is particulate formula
Bituminous concrete, what AC20 was indicated is middle grain formula bituminous concrete, and what AC25 was indicated is Coarse Graded Bituminous Concrete, SAC13 table
What is shown is particulate formula stone mastic asphalt etc..
Second part: in soil matrix layer and each simplified layer arrangement vertical strain sensor.
In soil matrix layer and each simplified layer arrangement vertical strain sensor, and guarantee all vertical strains sensing that arrangement is completed
Device is located at same vertical direction.
When specific operation, the pre-buried vertical strain sensor in paving structure, in soil matrix top surface, selection is appropriate first
Location arrangements vertical strain sensor, to test the strain data of soil matrix top surface；Then, according to the position of soil matrix vertical strain sensor
Remaining each arrangement of bottom sensor layer by layer of progress is set, and ensures the sensor except each layer in the surface of its underlying transducer.
In the process, guarantee sensor in same vertical direction, to guarantee the biography measured when road crust acts on single circle load
Sensor data are under same load action.
Part III: applying single circle load on bituminous pavement surface layer, and the load be located at each vertical strain sensing just on
Side, and acquire the vertical strain data of soil matrix layer and each simplified layer.
What road surface was born in actual work is wheel load, and standard axle load is reduced to power by standard axle load BZZ-100
Active area is the round and identical equivalent circle load of each point pressure, i.e., therefore double round loads or single circle load are used for road force
It learns and calculates, double circle loads are known as if the wheel load of every side is indicated with two circles, are known as if being indicated with a circle single
Circle load.The list circle load applied by drop hammer deflection meter is generallyd use when road surface test or detection.Therefore, the present invention is to drip
The load that green road crust applies is preferably single circle load, and make the geometric center of single circle load be located at each sensor just on
Side.
Part IV: modular inverse calculation is carried out using collected vertical strain data as back-calculation parameter.
Simplified pavement structure is considered as to new pavement structure, is layered again similar to former pavement structure,
The vertical strain data at the vertical strain data that collected soil matrix is pushed up layer by layer and each simplification bottom layer by layer are right as back-calculation parameter
Layers of material carries out modular inverse calculation in new pavement structure.
The deflection basin data that existing modular inverse calculation method is measured using drop hammer deflection meter is back-calculation parameters, deflection basin number
According to for road crust deflection value, lead to back-calculation parameter unification.Therefore the present invention has studied with soil matrix top surface vertical strain and road
Face respectively layer by layer bottom vertical strain be parameter reverse calculation algorithms, the shortcomings that overcome existing back-calculation parameter unification.Modular inverse calculation side
Method is aided with optimization algorithm usually based on the mechanics calculation procedure of road surface.Wherein, optimization algorithm can be used existing
There are the artificial neural network algorithm in technology, genetic algorithm etc. to be iterated inverse.
Combined with specific embodiments below and 1~4 pair of attached drawing Layer Modulus of Asphalt Pavement reverse calculation algorithms of the present invention are made further
Explanation.
As shown in Figure 1, a kind of Layer Modulus of Asphalt Pavement reverse calculation algorithms are disclosed in embodiment, including the following steps:
Step 1: placement sensor
Two kinds of representative asphalt pavement structure forms are chosen in certain Experiment Road, structure one is semi-rigid type base drip
Green road surface, structure two are Asphalt Pavement with Flexible Base.
Structure one are as follows: 4cmSAC13+8cmAC20+20cmCBG+20cmCS+20cmCS.
This pavement structure is reduced to the easy structure such as Fig. 2, that is, 4cmSAC13+8cmAC is considered as simplified layer 3, and drip
Cyan layer, in corresponding diagram " 3 "；20cmCBG is considered as simplified layer 2, in corresponding diagram " 2 "；20cmCS+20cmCS is considered as simplified layer 1, corresponding
In figure " 1 "；Soil matrix is individually considered as one layer, i.e. soil matrix layer 0, in corresponding diagram " 0 ".
The pre-buried vertical strain sensor in paving structure, in native substrate top surface selection appropriate location, arrangement is hung down first
Straight strain transducer P0, to test the strain data of soil matrix top surface；According to the position of soil matrix vertical strain sensor P0, at remaining
It is each simplification layer layer base fabric set vertical strain sensor P1, P2, P3, it is ensured that each layer of sensor its underlying transducer just
Top.
Structure two are as follows:
4cmSMA13+8cmAC20+12cmAC25+12cmAC25+12cmAC25+4cmAC10+48cmGB。
This pavement structure is reduced to the easy structure such as Fig. 3, that is,
4cmSMA13+8cmAC20+12cmAC25+12cmAC25+12cmAC25 is considered as simplified layer 3, in corresponding diagram " 3 "；
4cmAC10 is considered as simplified layer 2, in corresponding diagram " 2 "；48cmGB is considered as simplified layer 1, in corresponding diagram " 1 "；Soil matrix is individually considered as one
Layer, i.e. soil matrix layer 0, in corresponding diagram " 0 ".
In structure two, vertical strain sensor method for embedding is with structure one, and which is not described herein again.
Step 2: being further applied load and acquires data
As shown in Fig. 2, apply single circle load on one surface layer of structure, make the center of load right above the sensor at P.Modulus
The back-calculation parameter that inverse uses is each simplification of bituminous pavement vertical strain that the vertical strain data at bottom and soil matrix push up layer by layer layer by layer
Data acquire effective vertical strain data by each vertical strain sensor during load applies.
As shown in figure 3, structure two uses method placement sensor same as structure one, which is not described herein again.
Each collected data summarization of sensor is as shown in table 1.
The collected vertical strain data summary table of each sensor of table 1
Step 3: modular inverse calculation
The modular inverse calculation program based on glowworm swarm algorithm is write, inverse process is as shown in Figure 4.It is anti-with vertical strain data
It calculates parameter and modular inverse calculation is carried out to soil matrix layer and each simplified layer.
It should be noted that modular inverse calculation program utilizes the optimization algorithms such as artificial neural network algorithm or genetic algorithm
It optimizes, carries out modulus calculating by the Finite-Element Solution of finite element software, finite element is also common a kind of in inverse program
Method, details are not described herein.
Thus obtained inverse result is as shown in table 2 and table 3:
Modulus and inverse modulus summary sheet are designed in 2 structure one of table
Modulus and inverse modulus summary sheet are designed in 3 structure two of table
As can be seen that structure one belongs to semi-rigid asphalt pavement, CS, CBG in table 2 belong to semi-rigid material；
For structure second is that Asphalt Pavement with Flexible Base, the GB in table 3 is flexible material.
Since single circle load is by the simplified equivalent circle load of wheel load, power when single circle load is born on road surface
State is equal to actual working state when vehicular load is born on road surface.By inverse result it is found that according to above-mentioned modular inverse calculation
The Modulus results that method obtains meet the modulus under the actual working state of road surface, are also consistent with Pavement Design modulus.
Although embodiment of the present invention is described in conjunction with attached drawing above, the invention is not limited to above-mentioned
Specific embodiments and applications field, above-mentioned specific embodiment are only schematical, directiveness, rather than restricted
's.Those skilled in the art under the enlightenment of this specification, in the range for not departing from the claims in the present invention and being protected
In the case where, a variety of forms can also be made, these belong to the column of protection of the invention.
Claims (10)
1. a kind of Layer Modulus of Asphalt Pavement reverse calculation algorithms, which is characterized in that including following sections:
The road surface structare layer of bituminous pavement is simplified, the identical road surface structare layer of adjacent and material type is considered as one layer,
Simplify layer, and each simplified layer included structure sheaf between modulus difference no more than N MPa, soil matrix is individually considered as
One layer, i.e. soil matrix layer；
Vertical strain sensor is arranged in soil matrix layer and each simplified layer, and guarantees all vertical strain sensors that arrangement is completed
Positioned at same vertical direction；
It is further applied load on bituminous pavement surface layer, and the load is located at the surface of each vertical strain sensing, and passes through vertical strain
Sensor acquires soil matrix layer and simplifies the vertical strain data of layer；
Modular inverse calculation is carried out using collected vertical strain data as back-calculation parameter；
The value of N is 250~350.
2. Layer Modulus of Asphalt Pavement reverse calculation algorithms according to claim 1, which is characterized in that the road surface to bituminous pavement
Structure sheaf is simplified, by material type phase different from the material type of adjacent road surface structare layer or with adjacent road surface structare layer
Road surface structare layer of the same but modulus difference greater than N MPa is individually considered as one layer.
3. Layer Modulus of Asphalt Pavement reverse calculation algorithms according to claim 1, which is characterized in that the material type refers to by material
The classification that the chemical component of material carries out, the material type of the bituminous pavement includes asphalt, stabilized with inorganic binder class
Mixture and pellet class.
4. Layer Modulus of Asphalt Pavement reverse calculation algorithms according to claim 3, which is characterized in that the asphalt includes drip
Green concrete mixture (AC), Asphalt Stabilized Macadam (ATB), more rubble bituminous concretes (SAC), bituminous concrete moxture
(AM), drainage type asphalt wearing layer (OGFC), drainage type Asphalt Stabilized Macadam (ATPB) and stone mastic asphalt
(SMA)；The stabilized with inorganic binder class mixture includes that cement stabilized type, lime stabilization class and lime industrial residue are stablized
Class, wherein cement stabilized type includes cement stabilized grading crushed stones (CBG) and cement stabilized soil (CS)；The pellet class includes grade
With rubble (GB) and calking rubble.
5. Layer Modulus of Asphalt Pavement reverse calculation algorithms according to claim 1, which is characterized in that the value of the N is 300.
6. Layer Modulus of Asphalt Pavement reverse calculation algorithms according to claim 2, which is characterized in that the value of the N is 300.
7. Layer Modulus of Asphalt Pavement reverse calculation algorithms according to claim 1, which is characterized in that apply on bituminous pavement surface layer
Load is single circle load.
8. Layer Modulus of Asphalt Pavement reverse calculation algorithms according to claim 1, which is characterized in that in soil matrix layer and each simplified layer
Arrangement vertical strain sensor, which refers to, arranges vertical strain sensor on the layer top of soil matrix layer, sets vertically in the layer base fabric for simplifying layer
Strain transducer.
9. Layer Modulus of Asphalt Pavement reverse calculation algorithms according to claim 8, which is characterized in that collected vertical strain data
The vertical strain data at the vertical strain data pushed up layer by layer including soil matrix and each simplification bottom layer by layer.
10. according to claim 1 to Layer Modulus of Asphalt Pavement reverse calculation algorithms described in 9 any one, which is characterized in that modular inverse calculation
Inverse is iterated using artificial neural network algorithm or genetic algorithm.
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| CN108589491B (en) * | 2018-05-30 | 2020-08-14 | 同济大学 | Method for setting depth of rigid layer for modulus inversion of asphalt pavement |
| CN109918849A (en) * | 2019-04-01 | 2019-06-21 | 同济大学 | A kind of method for building up of bituminous pavement bitumen layer in-situ modules principal curve |
| CN113447342B (en) * | 2021-06-28 | 2022-05-10 | 哈尔滨工业大学 | Method for identifying modulus of each layer and contact state between layers of asphalt pavement |
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| CN1880576A (en) * | 2005-06-16 | 2006-12-20 | 郑州大学 | System identification technique for structural mechanics characteristic of pavement |
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| CN1576817A (en) * | 2004-09-07 | 2005-02-09 | 长安大学 | Modulus anti-inference method for rock-fill roadbed |
| CN1880576A (en) * | 2005-06-16 | 2006-12-20 | 郑州大学 | System identification technique for structural mechanics characteristic of pavement |
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