切向冻胀力（tangential frost-heave forces），地基土在冻结膨胀时，沿切向作用在基础侧表面的力。
切向冻胀力在桩身缺陷处，会产生应力集中，使桩身破坏。
The tangent frost heaving stress will generate stress concentration at the pile defects, thus damaging the pile body.
对于扩颈桩，由于扩颈处桩周侧面积增大而使切向冻胀力增大对桩产生不利影响。
As for the pile with the expanding neck, the tangent stress grows due to the increased area around the pile's side, which is detrimental to the pile body.
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