Inspection and Evaluation of Technical Conditions of Asphalt Pavement on Permafrost Highways
In order to study the road performance of asphalt pavement in permafrost regions,the FWD method,pavement core drilling,human survey and other means are used to detect and evaluate the strength and damage of asphalt pavement in permafrost regions of National Highway No.214.The research results show that the average deflection representative values of the left and right carriageways of National Highway No.214 are 31.5(0.01 mm)and 37.5(0.01 mm)respectively,indicating that the right side is affected by heavy traffic leading to Yushu,and the strength of asphalt pavement decreases rapidly.The maximum average deflection representative value of asphalt pavement along the whole route is 100(0.01 mm),and the minimum value is less than 5(0.01 mm),which is related to the differential development of permafrost along the road and the strength of frost heaving and thawing settlement.The pavement evenness of the whole route of National Highway No.214 is 24.6％,32.1％,6.3％and 37％respectively for good,medium,secondary and poor sections,while 61.6％,26.8％and 11.6％for good,medium and poor sections in pavement damage,which has a great impact on driving comfort and relatively small impact on driving safety.Pavement core drilling shows that the structural integrity has been seriously damaged,which is the fundamental reason for the reduction of asphalt pavement strength and the occurrence of defects in permafrost regions.The research results provide a reference value for the design and maintenance of asphalt pavement in permafrost regions.
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