路面层底拉应力最大，对融沉变形反映敏感；

The maximum tension stress appears at the base bottom, which is sensitive to thawing settlement.

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基层[公路]：路面层之下路基之上的道路结构部分。

Base course [highways] : the part of a road structure Below the wearing course and above the road Base.

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基层[公路]：路面层之下路基之上的道路结构部分。

Base; road base [highways] : the part of the road structure Below the base course and above the sub-base.

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