The Tension Fracture Simulation on the Asphalt Pavement with the Insufficient Compaction Roadbed

2011 ◽  
Vol 243-249 ◽  
pp. 3868-3872
Author(s):  
Lai Gui Wang ◽  
Mei Sheng Feng ◽  
Hong Zhu Zhang
Keyword(s):  
Tensile Stress ◽  
Asphalt Pavement ◽  
Crack Model ◽  
Tension Stress ◽  
Wheel Load ◽  
Tension Crack ◽  
Discontinuous Surface ◽  
The Road ◽  
Fracture Simulation ◽  
Pavement Structure

For the study of soft subgrade pavement cracking process, it establishes the pavement structure tension crack model by elastic layered theory. Based on the finite element method, it studies the tension crack evolution process. It establishes the tension crack stress criterion to the roadbed. Analysis shows that the distresses of asphalt pavement of the real highway results from the damage by asymmetric sedimentation which is under excessively axle loading on pavement structure, rather than the fatigue damage by axle loading repetitions in the condition of asymmetric intensity in the same layer. The results show that the soft degree of the subgrade is proportional to the tensile stress, the more localized soft, the easier to crack the road. The soft roadbed does not have a homogeneous structure of the road surface, the tension stress rupture occurred in the discontinuous surface. The road structure has a set of tensile stress under the circulation wheel load, it formats a new fracture surface, and the structure form corresponding evolves, and causes stress state change. At last most of the road sub-base crack, and surface cracking occurres, so the pavement failure.

scholarly journals Response Characteristics of Inverted-base Asphalt Pavement Structure in Cold Area under Multi-axle Loads

2020 ◽  
Vol 7 (4) ◽  
pp. 141-146
Author(s):  
Lin Wang ◽  
Chao Shan ◽  
Chuanfeng Zheng
Keyword(s):  
Tensile Stress ◽  
Asphalt Pavement ◽  
Base Layer ◽  
Rigid Base ◽  
Element Analysis ◽  
The Road ◽  
Response Characteristics ◽  
Pavement Structure ◽  
Axle Loads ◽  
Base Course

In cold areas, semi-rigid base asphalt pavement is prone to generate reflection cracks due to thermal contraction and dry shrinkage, and the base layer cracks can cause surface layer cracking and shorten the service life of the pavement. Aiming at understanding the response characteristics of asphalt pavement structure under multi-axle loads in cold areas, this paper took semi-rigid base asphalt pavement and inverted-base asphalt pavement as the research objects, and employed ANSYS to conduct finite element analysis on them to figure out the response characteristics of the asphalt pavement structure under the condition of different multi-axle loads and graded macadam base course. The research results showed that, the action of multi-axal loads increased the tensile stress of the base layer of the asphalt pavement and the tensile stress of the base layer of the semi-rigid base asphalt pavement, and increased the road surface deflection, which had resulted in insufficient bearing capacity of the pavement structure, and thus causing significant damages to the asphalt pavement; analysis of the response characteristics of the two types of asphalt pavement showed that, adding a graded macadam base course as the stress-absorbing layer is conductive to reducing the tensile stress of the base layer of the semi-rigid base asphalt pavement and effectively delaying or inhibiting reflection cracks generating on the pavement. The study of this paper provided a theoretical reference for the design and construction of asphalt pavement.

Analysis of Performance Decay Behavior for Asphalt Pavement Based on Aging

2013 ◽  
Vol 723 ◽  
pp. 22-26 ◽  
Author(s):  
Pei Long Li ◽  
Zhan Ding ◽  
Zheng Qi Zhang
Keyword(s):  
Shear Stress ◽  
Service Life ◽  
Tensile Stress ◽  
Simulation Analysis ◽  
Asphalt Pavement ◽  
Maximum Shear Stress ◽  
Maximum Tensile Stress ◽  
Pavement Structure ◽  
Analysis Of Performance ◽  
Decay Behavior

Aging is a main factor affecting the durability of asphalt pavement. To study decay behavior of asphalt pavement with aging, aged asphalt was extracted from stratified pavement mixtures for different service-life. The changes of asphalt properties with service time and depth variations of the pavement were discussed. And numerical simulation analysis of pavement structure was conducted with pavement gradient modulus changes caused by aging. The results indicate that asphalt stiffness increases and low-temperature performance decays sharply with the extension of pavement service life, especially in the first several years. The vertical aging differences from top to bottom of pavement were significant, the aging extents decrease continuously from the surface, which cause the gradient changes of pavement modulus. The maximum tensile stress and maximum shear stress all increase with surface modulus increasing, so more serious aging can induce greater gradient modulus, shear stress and tensile stress are larger under the same loads, which have more serious damage to the pavement structure.

Mechanics Analysis of Flexible Base Pavement Structure

2014 ◽  
Vol 580-583 ◽  
pp. 632-635
Author(s):  
Li Ya Su
Keyword(s):  
Elastic Modulus ◽  
Tensile Stress ◽  
Asphalt Pavement ◽  
Rapid Development ◽  
Vertical Displacement ◽  
Rigid Base ◽  
Load Factors ◽  
Mechanics Analysis ◽  
Flexible Base ◽  
Pavement Structure

With the rapid development of traffic cause in our country, the operating requirement of driving load factors to pavement structure become higher and higher. The Semi-rigid base asphalt pavement structure exposed some defects and shortcomings, so the study of flexible base asphalt pavement structure is put on the agenda under the circumstances.Based on the research achievements at home and abroad of the existing asphalt pavement structure , choosing different elastic modulus and thickness to calculate and analyze the flexible base by ANSYS, gaining the law and trend of mechanics response (the vertical displacement and tensile stress) about pavement structure for the flexible base pavement of each layer foundation to provide the design reference.

The Study on Road Performance and Pavement Structure Analysis for the Base Layer Material Stabilized by SRX

2012 ◽  
Vol 594-597 ◽  
pp. 1402-1406 ◽  
Author(s):  
Yue Zhang ◽  
Yun Long Zhao ◽  
Bao Yang Yu
Keyword(s):  
Resilient Modulus ◽  
Asphalt Pavement ◽  
Base Material ◽  
Base Layer ◽  
Rigid Base ◽  
The Road ◽  
Flexible Material ◽  
Calculation Results ◽  
Road Performance ◽  
Pavement Structure

In order to overcome the weakness of semi-rigidity base layer，the road performance of the SRX(Solution Road RomixSoilfix) stabilized base material and the mechanics response of asphalt pavement with the base layer stabilized by SRX have been studied in this paper. The CBR value and resilient modulus of SRX stabilized base material were given by indoor test. Based on the multiple layer elastic theory, both the mechanical responses of asphalt pavement structure with the SRX stabilized base and semi-rigid base were given, and according to the calculation results, the two kinds of pavement structure fatigue life were analyzed. The results have shown that the CBR value of SRX flexible material is greater than that of graded crushed stone; the SRX stable material can be used as pavement base layer, but the fatigue performance of SRX flexible base materials should be paid much attention.

Mechanics Analysis of the Structure of Fly-Ash-Flushed-by-Seawater Base Asphalt Pavement under Heavy Load

2012 ◽  
Vol 256-259 ◽  
pp. 1866-1870
Author(s):  
Ling Yu ◽  
Jing Yang ◽  
Long Sheng Bao ◽  
Guang Shan Zhu
Keyword(s):  
Fly Ash ◽  
Tensile Stress ◽  
Asphalt Pavement ◽  
Structural Parameters ◽  
Structural Parameter ◽  
Structural Stress ◽  
Road Asphalt ◽  
Heavy Load ◽  
The Road ◽  
Road Pavement

In order to find out the loading mechanism of Fly-Ash-Flushed-by-Seawater base asphalt pavement under heavy load and verify reasonable road pavement structure, this paper analysed the road model under different axel load with ABAQUS. The influence of structural stress and the road asphalt pavement deflection in different road structural parameters were shown in the paper. The result indicates that the structural stress and the deflection under heavy load are greater than they are under the standard load. When the vehicle is over load by 100％, the tensile stress of subbase is close to the allowable tensile stress. The structure of Fly-Ash-Flushed-by-Seawater base asphalt pavement can be designed to adapt to the over load traffic of Yingkou by adjusted the structural parameter in a certain range.

Effect of Asphalt Layer Modulus on the Mechanical Properties and Service Life of Heavy Load Semi-Rigid Asphalt Pavement

2011 ◽  
Vol 368-373 ◽  
pp. 193-196
Author(s):  
Xiao Hua Wang ◽  
Ji Shu Sun ◽  
Tian Xiao ◽  
Hui Ran Pi
Keyword(s):  
Mechanical Properties ◽  
Service Life ◽  
Tensile Stress ◽  
Asphalt Pavement ◽  
Pavement Design ◽  
Heavy Load ◽  
Surface Deflection ◽  
Pavement Structure ◽  
Base Course ◽  
Design Result

Asphalt layer modulus is one of the important mechanical parameters in pavement design. It will directly influence the design result and the mechanical properties of asphalt pavement structure. Using pavement design and analysis software, the effects of asphalt layer modulus on surface deflection, tensile stress at the bottom of base and sub-base course, stress at the the bottom of asphalt layer and service life of heavy load semi-rigid asphalt pavement structure were analyzed systematically. And the influencing laws were analyzed, too. The results indicate that the mechanical properties, deforming characteristics and service life of heavy load asphalt pavement were influnced significantly by asphalt layer modulus. With the increasing of asphalt layer modulus, the surface deflection, tensile stress at the bottom of base and sub-base course would significantly decrease, and service life of heavy load semi-rigid asphalt pavement structure would be improved.

Influence Analysis of Crack Depth and Position on Asphalt Pavement Structure with 3D Finite Element

2012 ◽  
Vol 450-451 ◽  
pp. 267-272 ◽  
Author(s):  
Peng Wang ◽  
Can Cui
Keyword(s):  
Finite Element ◽  
Shear Stress ◽  
Shear Strength ◽  
Surface Layer ◽  
Tensile Stress ◽  
Asphalt Pavement ◽  
Top Down ◽  
Eccentric Load ◽  
3D Finite Element ◽  
Pavement Structure

In recent years the research on Surface-initiated longitudinal cracking along wheelpath (or Top-Down cracking) is become a fresh hotspot in the field of pavement damage focused by international asphalt pavement engineering.Because the traditional load is the vertical surface load with uniform tire pressure, this loading is applied at only one position and no effort is made to distinguish between tire pattern.The traditional method can’t explain the mechanism of the top-down cracking. In order to discuss the mechanism of TDC, this paper establish a 3D finite element model of semi-rigid pavement structure and use the large finite element software Abaqus. The analysis shows that, in the crack beginning stage, the main tensile stress appears under the center of the load on the sub-base of the pavement,and its value increases with the time. When cracks appear in the base, the position of the main tensile stress appears at the bottom of the surface layer, under the outside edge of wheel path. The value of the main shear stress increases at the stage of the cracks beginning, but the increase is small. The value of the main shear stress decreases when the cracks appear in the middle of the surface layer, and the position of the main shear stress changes with the depth of the cracks. With the increase of the cracks’ depth, the adverse influence of the shear stress becomes weaker and weaker.So the key of controlling the cracks in the surface layer is prevention. To prevent the development of the cracks, the tensile strength of the layer’s material should be enhanced in any way. The stress and its value resulted from the vehicle loaded on the structure layer is bigger than the other cases when the position of the cracks is at the edge of wheel path, and the stress is much bigger than the shear strength and the fracture toughness of the material of the layer. As the shear strength of the material is not enough, the vertical cracks are easier to appear at the edge of wheel path under the load of the vertical. Once it appearing, the cracks will extended into the layer because of the load of vertical. Eccentric load generates greater stress in the structure than the load loaded upright. In fact, though, non-channeling can reduce the appearance of the tracks, eccentric load enhance the development of the cracks in the surface because of the existence of the cracks in the surface layer.

scholarly journals Decision of National and Provincial Highway Asphalt Pavement Structure Based on Value Engineering

2014 ◽  
Vol 2014 ◽  
pp. 1-8
Author(s):  
Yingwei Ren ◽  
Jingsong Shan
Keyword(s):  
Evaluation Method ◽  
Asphalt Pavement ◽  
Value Engineering ◽  
Pavement Performance ◽  
Road Maintenance ◽  
Good Reliability ◽  
Financial Investment ◽  
The Road ◽  
Engineering Theory ◽  
Pavement Structure

It is important that decision of asphalt pavement structure requires overall considerations of the performance and financial investment. To have asphalt pavement structure fulfilling good reliability, the asphalt pavement structure decision was researched based on value engineering theory. According to the national and provincial highway investigation data in Shandong Province during the last decade, the asphalt pavement performance attenuation rules of traffic levels and asphalt layer thicknesses were developed, and then the road performance evaluation method was presented. In addition, the initial investments, the costs of road maintenance, and middle-scale repair in a period were analyzed. For the light traffic and medium traffic example, using the value engineering method, the pavement performance and costs of which thickness varies from 6 cm to 10 cm were calculated and compared. It was concluded that value engineering was an effective method in deciding the asphalt pavement structure.

Mechanics Analysis of Semi-Rigid Subgrade Pavement Structure

2014 ◽  
Vol 580-583 ◽  
pp. 105-108
Author(s):  
Li Ya Su
Keyword(s):  
Tensile Stress ◽  
Elasticity Modulus ◽  
Asphalt Pavement ◽  
Vertical Displacement ◽  
Pavement Design ◽  
Rigid Base ◽  
Mechanics Analysis ◽  
Pavement Structure ◽  
Early Damage

The semi-rigid base asphalt pavement structure was choose often used to the highway in our country, but the semi-rigid base asphalt pavement early damage almost has become a common phenomenon.In this paper, the rule and trend of mechanics response about pavement structure (the vertical displacement and tensile stress) were analyzed under the semi-rigid base choose different elasticity modulus and thickness by ANSYS for muti-layer foundation of semi-rigid base pavement design to provide reference.

scholarly journals Analysis on Mechanical Behavior of Typical Asphalt Pavement Structure based on the Tire Load Effect

2021 ◽  
pp. 338-344
Author(s):  
Fuming Liu, Liming Zhang, Hongyan Sun
Keyword(s):  
Mechanical Behavior ◽  
Asphalt Pavement ◽  
Science And Technology ◽  
National Development ◽  
Road Construction ◽  
Design Specification ◽  
Load Effect ◽  
The Road ◽  
Significant Difference ◽  
Pavement Structure

Further development of modern science and technology has made more science and technology technologies used in the modern social and life practice, and much more is this with the road construction. National development cannot be separate from the convenient traffic facilities, and in the current stage, the asphalt pavement design specification in China requires the road construction by simulating the force of the vehicle on the pavement structure with the round uniformly distributed load under the supposition of continuous interlayer pavement structure. However, as time goes on, the disadvantages of such design specification have gradually exposed, in which different materials, construction schedule and weather conditions will result in the significant difference in the asphalt pavement construction, thus resulting in weak interlayer viscous structure of the pavement, and finally causing the road subsidence and cracking. For this reason, this article has analyzed the mechanical behavior of typical asphalt pavement structure on the basis of explaining the influencing factors of the tire on typical asphalt pavement pressure under the tire load effect, with the expectation that there will be more professional construction of the asphalt pavement.

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