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Full-flexible asphalt pavement structure design method

A technology for asphalt pavement and structural design, applied in the direction of on-site coagulation pavement, roads, roads, etc., can solve the problem of disconnection between asphalt pavement structure design and material design, improve design quality, improve service performance and life, Improve the overall effect

Pending Publication Date: 2022-02-18
SHANDONG HI SPEED COMPANY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical task of the present invention is to provide a fully flexible asphalt pavement structure design method to solve the problem that the current asphalt pavement structure design and material design are out of touch

Method used

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  • Full-flexible asphalt pavement structure design method
  • Full-flexible asphalt pavement structure design method
  • Full-flexible asphalt pavement structure design method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] as attached figure 1 Shown, the fully flexible asphalt pavement structural design method of the present invention, this method is specifically as follows:

[0043] S1. According to the current "Code for Design of Highway Asphalt Pavement" JTGD50-2017 Appendix A, determine the cumulative equivalent axis times Ne within the design period of the fully flexible asphalt pavement structure, and initially draft the pavement structure;

[0044] S2. Test and calculate the asphalt concrete complex modulus of the layer, construct the asphalt concrete fatigue model, and obtain the parameters of the asphalt concrete fatigue model; among them, the asphalt concrete complex modulus adopts bending and tension of the trapezoidal specimen under the condition of temperature 20 ℃ and frequency 10 Hz modulus;

[0045] S3. Calculate the allowable value of bending and tensile strain at the bottom of the asphalt mixture layer according to the calculation formula of asphalt concrete strain allo...

Embodiment 2

[0069] Embodiment 2: Jitai section high-speed entity project:

[0070] The Jitai Section Expressway is the radial line of the national expressway network. The Jitai Section Expressway starts from the central area of ​​Jinan City and ends in Tai’an City. It has eight lanes in both directions and a design speed of 120km / h. Among them, the pile numbers K418~K428 are fully flexible asphalt The design process of the pavement structure test section is as follows:

[0071] (1) Calculation of traffic load parameters: According to OD investigation and analysis, the traffic volume AADTT of large passenger cars and trucks at the section is 3560 vehicles / day, the annual growth rate of traffic volume γ is 4.0%, the direction coefficient DDF is 55.0%, and the lane coefficient LDF is 45.0 %, the design life is 30 years, and the base equivalent temperature is 22°C. The current "Code for Design of Highway Asphalt Pavement" JTGD50-2017 Appendix A calculates that the cumulative number of equiva...

Embodiment 3

[0081] Embodiment 3: Linzi to Linyi Expressway:

[0082] Linzi-Linyi Expressway, the main line of the project has a total length of 192.352 kilometers. The whole line adopts a two-way 6-lane design with a design speed of 120 km / h. K124~K130 adopts fully flexible asphalt pavement structure as the test section, and the design process is as follows:

[0083] The base equivalent temperature is 22.1°C, and the design life is 30 years.

[0084] (1) According to OD investigation and analysis, the traffic volume AADTT of large passenger cars and trucks at the section is 12,800 vehicles per day, the annual growth rate of traffic volume γ is 3.8%, the direction coefficient DDF is 50.0%, the lane coefficient LDF is 45.0%, and the design period is 30 In 2019, the base equivalent temperature was 21.6°C. The current "Code for Design of Highway Asphalt Pavement" JTGD50-2017 Appendix A calculates that the cumulative number of equivalent axle loads corresponding to the permanent deformation...

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Abstract

The invention discloses a full-flexible asphalt pavement structure design method, belongs to the field of asphalt pavement structure design in road engineering, and aims to solve the technical problem that the existing asphalt pavement structure design is disjointed from material design. According to the technical scheme, the method specifically comprises the steps of S1, determining the accumulative equivalent axis number Ne within the design age limit of a full-flexible asphalt pavement structure, and preliminarily planning the pavement structure; S2, testing and calculating the asphalt concrete complex modulus of the horizon, and constructing an asphalt concrete fatigue model; S3, according to an asphalt concrete strain allowable value calculation formula, calculating an asphalt mixture layer bottom flexural-tensile strain allowable value epsilon t-allowable; S4, calculating a roadbed top surface compressive strain allowable value epsilon z-allowable according to a roadbed top surface compressive strain calculation formula; S5, determining a bending-tensile strain calculation value epsilon t-calculation and a soil-based compressive strain calculation value epsilon z-calculation of a structural calculation layer by applying an elastic layered system theory; and S6, carrying out structure checking calculation by taking the conditions that the bending-tensile strain allowable value epsilon t-allowable is greater than the calculation value epsilon t-calculation of the bottom of the asphalt mixture layer and the compressive strain allowable value epsilon z-allowable is greater than the calculation value epsilon z-calculation of the top of the soil foundation as checking calculation indexes.

Description

technical field [0001] The invention relates to the field of asphalt pavement structure design in road engineering, in particular to a fully flexible asphalt pavement structure design method. Background technique [0002] Among the highways that have been completed and opened to traffic, the semi-rigid base asphalt pavement accounts for more than 90%. The semi-rigid base course provides technical support for the early design concept of "strong foundation, thin surface, and stable soil foundation" due to its strong board body and low cost. However, with the development of the economy, the traffic load has also shown new characteristics. The original analysis method can no longer meet the needs of the traffic infrastructure under the new situation. The early damage to the newly built roads frequently occurs, such as cracks, potholes, oil flooding, and muddying. , Internal looseness, etc. The maintenance cycle of the pavement is relatively short, and the service function and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E01C1/00E01C7/18
CPCE01C1/002E01C7/18
Inventor 姚望马士杰杨振宇徐希忠王晓然王林张晓萌闫翔鹏孙兆云胡家波符东绪韦金城
Owner SHANDONG HI SPEED COMPANY
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