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Study on Top-Down Crack Formation Mechanism and Propagation Law Near Load Area of Asphalt Pavement

Author: ZhangHong
Tutor: PeiJianZhong
School: Chang'an University
Course: Road and Railway Engineering
Keywords: Asphalt Pavement Near the loading area Top-Down Cracks Formation Mechanism Stress intensity factor
CLC: U416.217
Type: Master's thesis
Year: 2011
Downloads: 50
Quote: 0
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Abstract


Top-Down crack asphalt pavement to a new form of early disease , causes complex , far-reaching , it is a hot research at home and abroad in recent years and one of the difficult problems . Insight into the Top-Down Crack cracking mechanism of crack propagation law for preferred asphalt mix design improve the crack resistance of the pavement structure , improvement of the existing pavement design methods , and rational use of funds are important . We collect reviews relevant literature and research , and a classified summary of the asphalt pavement surface cracks . Given the diversity and complexity of the influencing factors , only by means of the finite element method , a three-dimensional model , and focus on the analysis of static load ( concave load , convex load , uniformly distributed load ) near the loading area pavement under conditions of stress and strain response law analyzed the possible location and reason for Top-Down crack formation . The analysis shows that uneven pavement near the loading area high stress and strain distribution area is easy to form surface cracks , non - uniformly distributed the upload and grassroots modulus will significantly affect nearly the distribution of high stress and strain of the loading area pavement surface cracks initial The location and time . In addition, by means of linear elastic fracture mechanics finite element method , simulation analysis of the pavement structure parameters , development regularity the different crack traits conditions , the asphalt pavement surface crack tip stress intensity factor . : Regardless of how much the thickness of the surface layer , the cracks in the depth of cut will significantly affect the stress intensity factor ; cracks along the direction of the carriageway level throughout the length of the only significant impact close to the load position at the stress intensity factor . Pavement structure parameters will significantly affect the stress intensity factor , and the impact of the law of similarity . Regardless of the pavement structure parameters , cracks cracking to 3-4cm away from the road surface , the stress intensity factor values ??are extremely disadvantageous .

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CLC: > Transportation > Road transport > Road works > Roadbed, pavement engineering > Pavement Engineering > Road : use of the material points > Asphalt Pavement
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