Notice of Retraction: Correction factor of surface deflection for asphalt pavement of granular sub-base based on linear-anisotropy

2011 ◽  
Author(s):  
Li Zhenfeng ◽  
Guo Xiangyun ◽  
Zhang Ming
Keyword(s):  
Correction Factor ◽  
Asphalt Pavement ◽  
Surface Deflection

Correction Factor of Surface Deflection for Inverted Asphalt Pavement Based on Linear-Anisotropy

2011 ◽  
Vol 255-260 ◽  
pp. 3311-3315
Author(s):  
Zhen Feng Li ◽  
Xiang Yun Guo ◽  
Ming Zhang
Keyword(s):  
Granular Material ◽  
Correction Factor ◽  
Asphalt Pavement ◽  
Practical Application ◽  
Material Anisotropy ◽  
Current Design ◽  
Surface Deflection ◽  
The Common ◽  
Different Thickness ◽  
Isotropic Theory

Inverted asphalt pavement has been widely used in practical application. Anisotropy of granular material has been proved by experiment, but the current design specifications are also based on isotropic theory. Based on linear-anisotropic model, on the condition of the high, medium and low strength of soil subgrade, 4 different thickness of asphalt layer and 3 different thickness of granular sandwich are been systematically studied, the results show that, the strength of the soil subgrade has bigger effect on the pavement deflection, the deflection difference of the low to the high subgrade is about 14~23%, with the increase of granular material anisotropy, the deflection correction factor is bigger, with the granular sandwich anisotropic rates from 0.1 to 0.5, the deflection correction factor is within 1.04, the thin asphalt layer and the thick granular sandwich have bigger effect on the deflection correction factor, for the common inverted asphalt pavement structure, the proposed deflection correction factor is 1.02~1.04, it can be used directly in asphalt pavement design.

Dynamic Response of Asphalt Pavement on Semi-Rigid Base due to Heavy Load

2013 ◽  
Vol 405-408 ◽  
pp. 1745-1752
Author(s):  
Li Juan Zhang
Keyword(s):  
Shear Stress ◽  
Surface Layer ◽  
Tensile Stress ◽  
Compressive Stress ◽  
Asphalt Pavement ◽  
Road Surface ◽  
Rigid Base ◽  
Heavy Load ◽  
Vertical Strain ◽  
Surface Deflection

The purpose of this paper is to study dynamic-characteristics of asphalt-pavement on semi-rigid base loaded with moving, heavy-load. Based on transient-dynamics theory, three-dimensional finite-element (FE) model was developed for structural dynamic-responses analysis using ANSYS software. The heavy-duty axle-load model was established according to Belgium-Design Code, and the dynamic-load was simplified as sinusoidal-wave load. For the pavement mechanics indexes (road-surface deflection, the vertical and lateral stress, the shear stress and the strain), the time-history curves and distribution conditions in the structure were presented. Expect tensile-strain at surface-layer, the relationship between axle-load weight and mechanic-indexes are almost linearly proportional. The calculation shows that under moving heavy-load, the surface-layer suffers from rather high vertical compressive-stress and shear-stress, the base and subbase are loaded with high tensile-stress and the subgrade top undergoes large vertical-strain . For asphalt-pavement on semi-rigid loaded with moving, heavy-load, besides the conventional indexes (including road-surface deflection and tensile-stress at the bottom of base or subbase), the design indexes should also include the shear-stress on road surface, the vertical-strain on the top of subgrade and the vertical compressive-stress on road surface.

Structural Mechanics Analysis of Asphalt Pavement Using Large Stone Asphalt Mixture as Base

2013 ◽  
Vol 838-841 ◽  
pp. 1221-1226
Author(s):  
Xu Liang ◽  
Yin Gu ◽  
Jin Chang Wang ◽  
Ming Xing Yan ◽  
Si Zeng You
Keyword(s):  
Asphalt Pavement ◽  
Asphalt Mixture ◽  
Rigid Base ◽  
Pavement Rehabilitation ◽  
Large Stone ◽  
Base Materials ◽  
Bending Strain ◽  
Flexible Base ◽  
Surface Deflection ◽  
Pavement Base

Asphalt pavement with semi-rigid base is the major structure adopted in the new built highway and municipal roads in China. So as to reduce the unfavorable impact on the rehabilitation of municipal roads which require quick resumption of traffic, better base materials should be adopted. If a pavement base fails, the flexible base, i.e. large stone asphalt mixture (LSAM), should be employed in the pavement rehabilitation practice. Focusing on the practice pavement sections using LSAM as base in Hangzhou municipal roads, the effect factors of subgrade modulus, base modulus and base thickness on surface deflection and bending strain in base bottom is analyzed. That work is done through finite element method of software BISAR3.0. The results provide a practice reference for municipal roads rehabilitation needing to open traffic early.

Study on the Axle Load Conversion Formula for Asphalt Pavement Based on Actually Measured Deflection Equivalent

2011 ◽  
Vol 97-98 ◽  
pp. 271-274
Author(s):  
Ji Shu Sun ◽  
Tian Xiao ◽  
Chun Feng Yang ◽  
Jian Cheng Sun
Keyword(s):  
Service Life ◽  
Asphalt Pavement ◽  
Pavement Design ◽  
Service Performance ◽  
Vehicle Load ◽  
Factors Influencing ◽  
Surface Deflection ◽  
Conversion Formula ◽  
Axle Loads ◽  
Research Achievement

Vehicle load is one of the most important factors influencing service performance and service life of pavement. In the pavement design and analysis, different axle loads need be conversed to the standard axle load based on the equivalent deterioration principle of pavement. Pavement surface deflection values under different axle loads have been measured on several expressways in this paper. The correlation relationships between deflection and axle loads are analyzed. The regularity of deflection and axle conversion index based on deflection equivalent are analyzed, too. The axle conversion formula based on deflection equivalent for asphalt pavement is regressed according to the actually measured deflection data. This research achievement can provide us with a reliable axle load conversion method for asphalt pavement design.

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.

Deformation Analysis of Pavement Structures under Coexistence of Vertical and Horizontal Loads

2010 ◽  
Vol 44-47 ◽  
pp. 3053-3059
Author(s):  
Nian Mei Zhang ◽  
Xu Dong Wang
Keyword(s):  
Strain Distribution ◽  
Integral Transform ◽  
Asphalt Pavement ◽  
Deformation Analysis ◽  
Maximum Displacement ◽  
Transform Method ◽  
Moving Vehicles ◽  
Surface Deflection ◽  
Pavement Structures ◽  
Integral Transform Method

The surface deflection and displacement is an important performance index to evaluate the bearing capacity of pavement structures. In this work, the dynamical responses of elastic pavement structures subjected to moving vehicles are studied. Based on the elasticity, the strain distribution and the deformation of asphalt pavement structures under coexistence of vertical and horizontal loads are investigated. Integral transform method is used to obtain the deflection response function. The influence of the horizontal braking load on the dynamic response of the pavement structure is analyzed. The results show that the horizontal force plays important roles on the maximum displacement and deflection, distribution of first principal strain of structure.

Impact of Subgrade Resilience Modulus on Heavy Load Asphalt Pavement Mechanical Properties

2011 ◽  
Vol 97-98 ◽  
pp. 28-31 ◽  
Author(s):  
Tian Xiao ◽  
Hui Ran Pi ◽  
Can Zhang Jin
Keyword(s):  
Tensile Stress ◽  
Design Method ◽  
Asphalt Pavement ◽  
Heavy Load ◽  
Pavement Surface ◽  
Stress Surface ◽  
Surface Deflection ◽  
Pavement Structure ◽  
Design Result ◽  
Resilience Modulus

Subgrade resilience modulus is an important mechanical parameter in pavement design. It will directly influence the design result of pavement structure. Using BISAR3 of SHELL design method, the impacts of subgrade resilience modulus on pavement surface deflection, base and subbase bottom tensile stress, surface layer bottom tensile stress of the heavy load asphalt pavement structure were analyzed. And the influencing laws were analyzed, too. The results show that the mechanical and deforming characteristics of heavy load asphalt pavement were influnced significantly by subgrade resilience modulus. With the increasing of subgrade resilience modulus, the pavement surface deflection, base bottom tensile stress would significantly decrease, and fatigue life would be improved.

Sign in / Sign up

Export Citation Format

Share Document