科研之友
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摘要
The influence of bonding condition between surface course and uncracked base course on pavement structure mechanical response has been studied for many years. All research indicate that the bonding condition should be firm as far as possible to decrease the flexural stress at bottom of layers. It is inevitable for semi-rigid base course to crack due to temperature shrinkage and moisture shrinkage. Shear stress at crack tip due to offset load applying on one side of crack was calculated at different friction coefficient between surface course and cracked base course. Flexural stress at crack tip due to temperature dropping was also calculated at different friction coefficient between surface course and cracked base course. The calculated data show that shear stress and flexural stress at crack tip both increase when the friction coefficient increases, which indicates that the bonding condition should be as smooth as possible for cracked pavement structure. For actual pavement structure, there exists uncracked section between two adjacent cracks. It is discussed based on stress data to estimate which section cracks firstly. The results indicate that there exists the optimum bonding condition between surface course and base course.
- 出版日期2009
- 单位长沙理工大学
