Mechanical Analysis on the New Type of Semi-Rigid Asphalt Pavement Structure Based on Dynamic Parameters
01 Jan 2013-
TL;DR: In this paper, the dynamic response of the new type of semi-rigid asphalt pavement structure under different speed and continuous variable speed of vehicle was studied. And the results showed that the vehicle speed has few effects on dynamic responses of pavement structure.
Abstract: In order to study the dynamic response of the new type of semi-rigid asphalt pavement structure under different speed and continuous variable speed of vehicle,the 3Dfinite element model is built by ABAQUS based on the elastic layered system theory,the dynamic modulus parameters of pavement materials are utilized,and the subroutine UTRACLOAD and DSLOAD are compiled.In addition,mechanical responses of pavement structure calculated by static parameters are compared.And difference of mechanical performance indexes between new semi-rigid and the traditional pavement structure are also analysed.The results show that the vehicle speed has few effects on dynamic responses of pavement structure.Compared to the calculations by static modulus,strain of semi-rigid base layer is reduced and shear stress of asphalt surface course is increased when dynamic modulus is used.Furthermore,the new type of semi-rigid pavement structure can effectively reduce the rutting probability of intersections and improve its resistance to permanent deformation.
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TL;DR: In this paper, visual intervention has a significant influence on drivers' behavior, which may cause the redistribution of wheel tracks, relieving the stress from the concentration of axial loads so that the rut...
Abstract: Visual intervention has a significant influence on drivers’ behaviour, which may cause the redistribution of wheel tracks, relieving the stress from the concentration of axial loads so that the rut...
39 citations
Cites background from "Mechanical Analysis on the New Type..."
...Based on Luo (2005), Chen and Liu (2013), for typical asphalt pavement structure with semi-rigid base, (1) permanent deformation of subbase and subgrade only accounts for less than 10% of total rutting deformation; (2) when surface layer is thick enough, the rutting deformation of subbase and…...
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TL;DR: In this article, a series of the true triaxial undrained test were carried out on the GDS apparatus, and the 3D deformation, failure, and other characteristics of the dense sand are obtained.
Abstract: Aimed at the characteristics of aeolian sand under rapid construction conditions in desert geotechnical engineering, a series of the true triaxial undrained test were carried out on the GDS apparatus. The 3D deformation, failure, and other characteristics of the dense sand are obtained. Under the condition of same , the state transition point where the void water pressure changes from increasing to decreasing appears earlier and leads to enhanced dilatancy with the increase of b, which means the enhanced dilatancy of dense sand caused the increase in strength. The results of the same b shows that the void water pressure generally indicates a decrease at low confining pressure and an increase at high confining pressure, indicating that the aeolian sand shows dilatancy at low confining pressure and contraction at high confining pressure. The state transition point increases with the increase of , but all points tend to the same critical state line and state transition line. When b = 0, the critical state line is q = 1.57 , and the state transition line is q = 1.23 . When b = 1, the critical state line is q = 1.24 , and the state transition line is q = 1.04 . The results at same b obtained the unified critical state line and the state transition line. Therefore, the true triaxial test can obtain the unified relationship of void ratio, and b, which overcomes the fact that the existing test cannot consider the influence of b. The test results provide a basis data for the design, construction, and maintenance of geotechnical engineering in Tengger Desert.
8 citations
References
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TL;DR: In this paper, visual intervention has a significant influence on drivers' behavior, which may cause the redistribution of wheel tracks, relieving the stress from the concentration of axial loads so that the rut...
Abstract: Visual intervention has a significant influence on drivers’ behaviour, which may cause the redistribution of wheel tracks, relieving the stress from the concentration of axial loads so that the rut...
39 citations
••
TL;DR: In this article, a series of the true triaxial undrained test were carried out on the GDS apparatus, and the 3D deformation, failure, and other characteristics of the dense sand are obtained.
Abstract: Aimed at the characteristics of aeolian sand under rapid construction conditions in desert geotechnical engineering, a series of the true triaxial undrained test were carried out on the GDS apparatus. The 3D deformation, failure, and other characteristics of the dense sand are obtained. Under the condition of same , the state transition point where the void water pressure changes from increasing to decreasing appears earlier and leads to enhanced dilatancy with the increase of b, which means the enhanced dilatancy of dense sand caused the increase in strength. The results of the same b shows that the void water pressure generally indicates a decrease at low confining pressure and an increase at high confining pressure, indicating that the aeolian sand shows dilatancy at low confining pressure and contraction at high confining pressure. The state transition point increases with the increase of , but all points tend to the same critical state line and state transition line. When b = 0, the critical state line is q = 1.57 , and the state transition line is q = 1.23 . When b = 1, the critical state line is q = 1.24 , and the state transition line is q = 1.04 . The results at same b obtained the unified critical state line and the state transition line. Therefore, the true triaxial test can obtain the unified relationship of void ratio, and b, which overcomes the fact that the existing test cannot consider the influence of b. The test results provide a basis data for the design, construction, and maintenance of geotechnical engineering in Tengger Desert.
8 citations