通过实际工程的低应变桩基动测，发现打入桩的波速随时间提高。
Low strain dynamic testing on actual pile was conducted to investigate if the wave velocity is varied in the installed pre-cast pile.
对非线性模量与应变的关系作了非线性拟合，用非线性模量来代替弹性模量，对弹性介质中的波速公式作了修正。
The nonlinear fitting is made on the relations between the nonlinear modulus and strain. The velocity formula in the elastic medium is corrected by using nonlinear modulus instead of elastic modulus.
结果表明，在给定的应变破坏标准下，饱和砂土剪切波速与抗液化强度具有良好的相关性。
The result shows that the shear-wave velocity of saturated sand could be strongly related to the liquefaction resistance under a certain liquefaction criterion.
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