多年冻土公路沥青路面技术路况检测与评价

Inspection and Evaluation of Technical Conditions of Asphalt Pavement on Permafrost Highways

为研究多年冻土地区公路沥青路面的路用性能,采用FWD法、路面钻芯和人工调查等多种手段,对国道214公路多年冻土地区沥青路面强度、破损状况进行了检测与评价,研究结果表明:国道214公路左、右幅行车道路面平均弯沉代表值分别为31.5(0.01 mm)和37.5(0.01 mm),表明右侧受通往玉树地区的重载交通影响,路面强度衰减较快。全线沥青路面平均弯沉代表值最大为100(0.01 mm),最小不到5(0.01 mm),与公路沿线多年冻土差异性发育和冻胀融沉强度相关。国道214公路全线路面平整度良、中、次、差路段分别达到24.6%、32.1%、6.3%和37%,而路面破损状况良、中、差路段分别为61.6%、26.8%和11.6%,对行车舒适度影响较大,行车安全性影响相对较小。路面钻芯表明结构整体性遭到严重破坏,是多年冻土地区沥青路面强度降低和病害产生的根本原因。研究成果为多年冻土地区沥青路面的设计与养护提供了参考。

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.214are 31.5(0.01mm)and 37.5(0.01mm)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(0.01mm),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.214is 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.