| Because of abominable weather and complicated topography, Asphalt overlay on concrete pavement in mountain areas usually suffers rather serious reflection cracking, track and cutting-slippage prematurely, which has serious influence on the service ability of reconstructed pavement. Looking through the project of pavement reconstruction in Danjiang section of No.316 national highway, the author studies the technique of building asphalt overlay on concrete pavement in mountain areas.After investigation and assessment of the old concrete pavement in Danjiang section of No.316 national highway, taking local climate and the characteristic of pavement load into consideration, the author brings forward the reconstruction method and the structure of reconstruction pavement on the base of analyzing the three main damages: reflection, cracking track and cutting-slippage, of asphalt overlay on concrete pavement in mountain areas.In the survey of highway route, the author realizes that sections of route with big longitudinal gradient and small radius take a high proportion. It is inevitable that it influences the stress condition in the pavement. Hence, this paper analyzes the vertical load and horizontal load when vehicles travel on slopes, track curves, and when vehicles brake separately. And then it analyzes the stress in asphalt overlay and the stress at different depth in the reconstruction pavement in each instance with 3-D finite element software. Finally it also analyzes the stress in pavement with different overlay modulus and different overlay thickness.The analysis of the pavement reveals that horizontal load produced due to the characteristics of pavement route in mountain areas has increased the tensile stress and shearing stress within the pavement, which pricks up the damage of pavement, so the overlay should be of suitable modulus and thickness. At present, Danjiang section of No. 316 national highway has been run for more than one year, and the pavement is still in order.
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