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Research on Dynamic Response and Crack Mechanism of Composite Pavement with Stress Absorbing Layer

Author: ZhouJuanLan
Tutor: ZhengMuLian
School: Chang'an University
Course: Road and Railway Engineering
Keywords: Composite Pavement Stress-absorbing layer Moving Load Dynamic response Reflective cracking Fatigue life Structural design
CLC: U416.2
Type: Master's thesis
Year: 2011
Downloads: 64
Quote: 0
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Abstract


Numerous studies show that paved asphalt surface layer built on cement concrete pavement the composite pavement can overcome the shortcomings of cement concrete pavement and asphalt pavement , centralized structure has the advantage of two pavement . However, due to the existence of original concrete panel seams , cracks and defects in the external loads asphalt layer apt reflection cracks . Set in concrete panels and asphalt layer between stress-absorbing layer can ease or even prevent reflection cracks , this article on the set of modified asphalt mixture stress-absorbing layer composite mechanical response of the pavement and cracking mechanism systematic study . The papers moving sine wave loads applied to the pavement , using the finite element software absorb the mechanical characteristics of the composite pavement structure layers of two cases , no stress and comparative analysis of the pavement structure under static and dynamic loading , the mechanical response and analysis of the impact of the of different flatness of the stress and deflection of the pavement structure , the results show that with the flatness reduce stress and deflection of the two structural seams are gradually increasing . On this basis , the analysis of moving loads of asphalt overlay thickness and modulus , stress-absorbing layer thickness and modulus , cement concrete slab thickness , modulus , grassroots thickness , modulus and soil base modulus parameters change set with no stress-absorbing layer composite pavement structure by the force of the impact of the law to come to set the stress-absorbing layer , the concrete panel joints at stress concentration can be significantly improved , and recommended based on the results of the stress-absorbing layer thickness The modulus of the recommended value . In addition , through Franc2d software simulates no stress fracture path absorption layer composite pavement structure and to draw its fatigue life , results show that the set stress absorption layer can be effectively improved by the force of the pavement structure , prevent and delay reflective cracking generation , to significantly extend the fatigue life of the pavement structure . Finally , the previous text computational analysis based on a combination of design composite pavement structure proposed pavement structure design the ultimate destruction of the state and its design method discussed .

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CLC: > Transportation > Road transport > Road works > Roadbed, pavement engineering > Pavement Engineering
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