CN104792975A - Asphalt pavement structure layer modulus inversion method - Google Patents
Asphalt pavement structure layer modulus inversion method Download PDFInfo
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- CN104792975A CN104792975A CN201510156007.7A CN201510156007A CN104792975A CN 104792975 A CN104792975 A CN 104792975A CN 201510156007 A CN201510156007 A CN 201510156007A CN 104792975 A CN104792975 A CN 104792975A
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- 238000000034 method Methods 0.000 title claims abstract description 32
- 239000010426 asphalt Substances 0.000 title claims abstract description 16
- 239000002689 soil Substances 0.000 claims abstract description 33
- 239000011159 matrix material Substances 0.000 claims description 18
- 238000001514 detection method Methods 0.000 claims description 8
- 238000003801 milling Methods 0.000 claims description 8
- 239000004567 concrete Substances 0.000 claims description 4
- 238000011156 evaluation Methods 0.000 abstract description 3
- 239000000463 material Substances 0.000 description 10
- 239000011384 asphalt concrete Substances 0.000 description 9
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 8
- 235000011941 Tilia x europaea Nutrition 0.000 description 8
- 239000004571 lime Substances 0.000 description 8
- 238000011160 research Methods 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 238000013461 design Methods 0.000 description 3
- 238000012423 maintenance Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000013528 artificial neural network Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000002068 genetic effect Effects 0.000 description 1
Abstract
The invention discloses an asphalt pavement structure layer modulus inversion method and belongs to the field of road engineering. According to the method, pavement structure layer surface deflection is detected layer by layer, pavement structure moduli are inversed layer by layer from bottom to top, and except the soil base modulus, inversion results of the structure moduli of lower layers are introduced into inversion of the moduli of upper layers until the moduli of all the pavement structure layers are inversed. Compared with the prior art, the method has the advantages that a reliable method is provided for inversion of the moduli of the pavement structure layers, and technical problems that traditional inversion methods are not unique in solution and inversion results do not conform to actual results are solved; meanwhile, soil base moduli at different stress states are obtained, the technical problem that the traditional inversion methods cannot determine soil base modulus stress dependence characteristics is solved, an effective technical means is provided for pavement structure performance evaluation, and the method has high popularization and application values.
Description
Technical field
The present invention relates to field of road, specifically a kind of asphalt pavement structural layer module backcalculation method.
Background technology
Asphalt pavement structure module backcalculation be old pavement structural behaviour evaluate important means, simultaneously by pavement layer modulus inverting for pavement structure Maintenance Design provides parameter.There is multiple road Research on Structural Modulus inversion method at present, comprise search procedure, genetic algorithm, inertial point method, artificial neural network method etc., although be widely applied, but still have the following disadvantages: one, be all based on road list one deflection basin inverse, fundamentally do not solve the nonuniqueness problem of road surface multiple layer (being greater than 2 layers) inverse modulus solution, the experience of inverse result depends on inverse to a great extent person, randomness is comparatively large, causes the road surface structare layer modulus of inverse not conform to the actual conditions; Two, in road surface structare layer module backcalculation process, do not consider the stress dependence of soil matrix soil and the modulus of soil matrix under actual stress state cannot be determined.The not enough shortcoming that above-mentioned road surface structare layer module backcalculation exists has a strong impact on the reliability of pavement structure performance evaluation and Maintenance Design.
Summary of the invention
Technical assignment of the present invention is for above-mentioned the deficiencies in the prior art, a kind of asphalt pavement structural layer module backcalculation method based on multilayer deflection basin is provided, asphalt pavement multiple layer Research on Structural Modulus inverting uniqueness of solution can be realized, make the Research on Structural Modulus of inverting consistent with virtual condition.
Technical assignment of the present invention realizes in the following manner: a kind of asphalt pavement structural layer module backcalculation method, is characterized in that comprising the following steps:
A) adopt successively milling, successively detect the deflection basin of each structural sheet surface coplanar coordinate points in pavement structure;
B) each pavement layer modulus in bottom-up Layer by layer inversion road surface, except soil modulus, understructure module backcalculation result substitutes in last layer module backcalculation, until all road surface structare layer module backcalculation of road crust complete.
The concrete operation method of step a) is preferably: first detect road surfaces deflection basin, then by successively milling, is successively carrying out deflection basin detection with surperficial measuring point same level coordinate points, until milling and detection are to the last layer surface of soil matrix.
Described deflection basin detects and preferably adopts Falling Weight Deflectometer (FWD) testing tool.
The concrete operation method of step b) is preferably: first carry out module backcalculation to soil matrix and last layer road surface structare layer thereof, then the understructure module backcalculation result except soil matrix is substituted in last layer module backcalculation again, the rest may be inferred, until inverting is to top layer, all road surface structare layer module backcalculation complete, wherein, soil modulus is not fixed, and all re-starts in every one deck module backcalculation.
Be described in further detail step b, its step is as follows:
B1, obtain n-th layer road surface structare layer modulus E according to (n-1)th layer of road surface structare layer module backcalculation
n (n-1)and last layer road surface structare layer modulus E
n-1;
B2, by (n-1)th layer of road surface structare layer modulus E
n-1substitute in the n-th-2 layers module backcalculation, obtain n-th layer road surface structare layer modulus E
n (n-2)and the n-th-2 layers road surface structare layer modulus E
n-2;
B3, again by (n-1)th layer of road surface structare layer modulus E
n-1, the n-th-2 layers road surface structare layer modulus E
n-2substitute in the n-th-3 layers module backcalculation, obtain n-th layer road surface structare layer modulus E
n (n-3)and the n-th-3 layers road surface structare layer modulus E
n-3;
B4, the rest may be inferred, until inverting is to top layer, all road surface structare layer module backcalculation complete;
N is the total number of plies of road surface structare layer to be measured, gets the natural number being more than or equal to 2.N-th layer is the soil matrix of the pavement structure bottom.
As n=2, completing steps b1, namely completes all road surface structare layer module backcalculation.
As n=3, completing steps b2, namely completes all road surface structare layer module backcalculation.
As n=4, completing steps b3, namely completes all road surface structare layer module backcalculation.
As n=5, after completing steps b3, then carry out next round inverting in the same way, just complete all road surface structare layer module backcalculation.By that analogy, when n deduct inverting number of times equal 1 time, inverting is to top layer, and all road surface structare layer module backcalculation complete.
Described road surface structare layer inverting is all undertaken by deflection basin equivalence principle.
Asphalt pavement structural layer module backcalculation method of the present invention compared with prior art has following outstanding beneficial effect:
(1) this method solve the nonuniqueness problem of Multilayer Pavements structure inversion solution, the pavement structure modulus of inverting is consistent with virtual condition, improves the reliability of pavement structure performance evaluation and Maintenance Design;
(2) all can obtain the soil modulus under corresponding detection layers position and the soil modulus under different stress when every one deck road surface structare layer carries out module backcalculation, namely soil modulus is not a fixed value, the corresponding different soil modulus of different stress.Therefore, this method solve the stress Dependence Problem of soil modulus in pavement structure module backcalculation, under different stress condition, the determination of soil modulus provides effective means;
(3) the method algorithm simple, be easy to realize.
Accompanying drawing explanation
Accompanying drawing 1 is Pavement Structure Combination and deflection basin point position schematic diagram in embodiment;
Accompanying drawing 2 is process flow diagrams of multilayer deflection basin inverting Research on Structural Modulus in embodiment.
Embodiment
A kind of asphalt pavement structural layer module backcalculation method of the present invention is described in detail below with specific embodiment with reference to Figure of description.
Embodiment:
One, milling detects
As shown in Figure 1, certain Highway Pavement Structures is made up of asphalt concrete layer 1, semi-rigid material basic unit 2, lime improved soill subbase 3 and soil matrix 4.Asphalt concrete layer 1, semi-rigid material basic unit 2, lime improved soill subbase 3 thickness are respectively 12cm, 32cm, 50cm.
After determining check point, first at asphalt concrete layer 1(superficial layer) put 5 and carry out deflection basin detection, obtain deflection basin data; Then asphalt concrete layer 1 is fallen in milling, pushes up carry out deflection basin detection with point 5 same level coordinate position points 6 in semi-rigid material basic unit 2.Repeat above-mentioned work, deflection basin detection is carried out to point 7.Each measuring point deflection basin testing result gathers as shown in table 1.
Table 1 different layers position deflection basin same level coordinate points testing result
Two, Inversion Calculation
As shown in accompanying drawing 2 inverting flow process: first, according to measuring point 7 deflection basin data, according to deflection basin equivalence principle inverting lime improved soill subbase 3 and soil matrix 4 modulus, obtain the modulus E of lime improved soill subbase 3
3for 1792.8Mpa, soil matrix 4 modulus E
43for 204.8Mpa; The second, the lime improved soill subbase 3 modulus E that inverting is obtained
3in input upper strata semi-rigid material basic unit 2 module backcalculation, according to measuring point 6 deflection basin data, according to deflection basin equivalence principle inverting semi-rigid material basic unit 2 and soil matrix 4 modulus, obtain the modulus E of semi-rigid material basic unit 2
2for 2889.9Mpa, soil matrix 4 modulus E
42be 261.6 Mpa; 3rd, the lime improved soill subbase 3 modulus E that inverting is obtained
3, semi-rigid material basic unit 2 modulus E
2in input asphalt concrete layer 1 module backcalculation, according to measuring point 5 deflection basin data, according to deflection basin equivalence principle inverting asphalt concrete layer 1 and soil matrix 4 modulus, obtain the modulus E of asphalt concrete layer 1
1for 7213Mpa, soil matrix 4 modulus E
41for 331.4Mpa.Thus, each Rotating fields modulus is obtained by above-mentioned inverting as follows:
Asphalt concrete layer 1:7213Mpa;
Semi-rigid material basic unit 2:2889.9Mpa;
Lime improved soill subbase 3:1792.8Mpa;
Soil matrix 4: because soil is that stress relies on material, when different layers position is carried out deflection testing, it is subject to stress state difference, so reflect different modulus levels, carrying out detecting soil matrix 4 modulus corresponding respectively on asphalt concrete layer 1, semi-rigid material basic unit 2, lime improved soill subbase 3 surface is 331.4Mpa, 261.6Mpa, 204.8Mpa.
The solution of the pavement layer modulus obtained according to above-mentioned asphalt pavement structural layer inversion method is unique, and reflection pavement structure virtual condition.
Claims (5)
1. an asphalt pavement structural layer module backcalculation method, is characterized in that comprising the following steps:
A) adopt successively milling, successively detect the deflection basin of each structural sheet surface coplanar coordinate points in pavement structure;
B) each pavement layer modulus in bottom-up Layer by layer inversion road surface, except soil modulus, understructure module backcalculation result substitutes in last layer module backcalculation, until all road surface structare layer module backcalculation of road crust complete.
2. asphalt pavement structural layer module backcalculation method according to claim 1, it is characterized in that the concrete grammar of step a): first detect road surfaces deflection basin, then by successively milling, successively carrying out deflection basin detection with surperficial measuring point same level coordinate points, until milling and detection are to the last layer surface of soil matrix.
3. asphalt pavement structural layer module backcalculation method according to claim 1 and 2, is characterized in that described deflection basin detects and adopts Falling Weight Deflectometer.
4. asphalt pavement structural layer module backcalculation method according to claim 1, it is characterized in that the concrete grammar of step b): first module backcalculation is carried out to soil matrix and last layer road surface structare layer thereof, then the understructure module backcalculation result except soil matrix is substituted in last layer module backcalculation again, the rest may be inferred, until inverting is to top layer, all road surface structare layer module backcalculation complete, wherein, soil modulus is not fixed, and all re-starts in every one deck module backcalculation.
5. asphalt pavement structural layer module backcalculation method according to claim 1, is characterized in that described road surface structare layer inverting is all undertaken by deflection basin equivalence principle.
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| CN107389477A (en) * | 2017-06-14 | 2017-11-24 | 东南大学 | A kind of Layer Modulus of Asphalt Pavement reverse calculation algorithmses |
| CN108375511A (en) * | 2018-02-12 | 2018-08-07 | 广州肖宁道路工程技术研究事务所有限公司 | Pavement structure parameter acquiring method and system, storage medium and equipment |
| CN108589491A (en) * | 2018-05-30 | 2018-09-28 | 同济大学 | The method of depth is set for the rigid layer of Layer Modulus of Asphalt Pavement inverting |
| CN110485222A (en) * | 2019-07-29 | 2019-11-22 | 中国铁路总公司 | A kind of dynamic data inversion method and device |
| CN111273344A (en) * | 2020-03-02 | 2020-06-12 | 广州海洋地质调查局 | Chromatographic inversion method based on continuous-to-refracted wave and processing terminal |
| CN112681179A (en) * | 2020-12-17 | 2021-04-20 | 东南大学 | Pavement structure stress detection and maintenance early warning method based on intelligent particle structure |
| CN113447342A (en) * | 2021-06-28 | 2021-09-28 | 哈尔滨工业大学 | Method for identifying modulus of each layer and contact state between layers of asphalt pavement |
| CN116118189A (en) * | 2023-01-16 | 2023-05-16 | 石家庄铁道大学 | 3D printing technology-based rutting test block structure modulus targeting design method |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107389477A (en) * | 2017-06-14 | 2017-11-24 | 东南大学 | A kind of Layer Modulus of Asphalt Pavement reverse calculation algorithmses |
| CN107389477B (en) * | 2017-06-14 | 2019-08-20 | 东南大学 | A kind of Layer Modulus of Asphalt Pavement reverse calculation algorithms |
| CN108375511A (en) * | 2018-02-12 | 2018-08-07 | 广州肖宁道路工程技术研究事务所有限公司 | Pavement structure parameter acquiring method and system, storage medium and equipment |
| CN108589491A (en) * | 2018-05-30 | 2018-09-28 | 同济大学 | The method of depth is set for the rigid layer of Layer Modulus of Asphalt Pavement inverting |
| CN110485222A (en) * | 2019-07-29 | 2019-11-22 | 中国铁路总公司 | A kind of dynamic data inversion method and device |
| CN110485222B (en) * | 2019-07-29 | 2020-11-27 | 中国铁路总公司 | Dynamic data inversion method and device |
| CN111273344A (en) * | 2020-03-02 | 2020-06-12 | 广州海洋地质调查局 | Chromatographic inversion method based on continuous-to-refracted wave and processing terminal |
| CN111273344B (en) * | 2020-03-02 | 2022-01-25 | 广州海洋地质调查局 | Chromatographic inversion method based on continuous-to-refracted wave and processing terminal |
| CN112681179A (en) * | 2020-12-17 | 2021-04-20 | 东南大学 | Pavement structure stress detection and maintenance early warning method based on intelligent particle structure |
| CN113447342A (en) * | 2021-06-28 | 2021-09-28 | 哈尔滨工业大学 | Method for identifying modulus of each layer and contact state between layers of asphalt pavement |
| 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 |
| CN116118189A (en) * | 2023-01-16 | 2023-05-16 | 石家庄铁道大学 | 3D printing technology-based rutting test block structure modulus targeting design method |
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