In the design and construction of the pipeline concomitant road,the specialsubgrade is extremely common.Without special treatment measures,road settlement and frost boiling will occur frequently and the road traffic efficiency will be affected.Through specific engineering cases,subgrades in permafrost areas,salivary flow ice sections and collapsible loess areas and other specialsubgradescommonly seen in the concomitant road construction are introduced,and design key points and construction quality control measures of each kind of subgrades are expounded:crushed stone replacement and providing insulating berms at the side slope can be adopted for the subgrade in permafrost areas;raising the subgrade,setting the ice collecting ditch,ice guard dike and other treatment ways can be adopted for the subgrade in salivary flow ice sections;watering compacting,replacement filling and other treatment ways are mainly adopted for the collapsible loess subgrade.After treatment of the special subgrade,the substrate strength can be improved,the road diseases can be reduced and the road service life can be increased.%在管道伴行路的设计施工中,特殊路基极为常见,若不采取特殊措施处理,往往会导致道路沉降、翻浆,影响道路通行效率.通过具体工程实例,对多年冻土地区路基、涎流冰地段路基、湿陷性黄土地区路基等在伴行路施工中常见的特殊路基进行了介绍,阐述了每种路基的设计要点及施工质量控制措施:多年冻土地区路基可以采用碎石换填、在边坡设置保温护道等方式处理;涎流冰地段路基可采用抬高路基、设置聚冰沟、挡冰堤等处理方式;湿陷性黄土地区路基主要采用洒水夯实、换填等处理方式.特殊路基经处理后,可提高基底强度,减少道路病害,增加道路使用年限.
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