Research on Construction Technology of Asphalt Upper Surface Course in Extra-long Tunnel
In order to ensure the construction quality of tunnel pavement,this paper takes the LM5-1 bid section on Jiuzhaigou(Gansu-Sichuan boundary)to Mianyang Expressway in Sichuan Province as the research object,and analyzes the mixture proportion design results of the asphalt upper surface course of the extra-long tunnel from the aspects of mineral aggregate gradation and optimal oil-stone ratio.The key points of the construction technology of the upper surface course are analyzed from the aspects of lower bearing course treatment and asphalt mixture mixing,transportation and compaction.At the same time,the construction safety guarantee measures of the upper surface course are put forward,and the research results can provide guidance for the construction of similar projects.
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