The stress - wave reflection method exist limitation in testing the quality of foundation pile. The direction of defects in pile body exerts a tremendous influence on testing results.
应力波反射法在检测基桩质量的应用上存在着方法上的局限，且桩身缺陷的方向性对检测结果影响极大。
The tangent frost heaving stress will generate stress concentration at the pile defects, thus damaging the pile body.
切向冻胀力在桩身缺陷处，会产生应力集中，使桩身破坏。
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.
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.
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。
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