刚度与质量参数随机时相频特性均值曲线的拐点位置不变，只是拐点附近曲线陡峭度减小。
The position of knee point of Phase-frequency characteristic mean value curve is invariant, but the kurtosis of the curve near the knee point decreases.
试验结果表明，波速大小和波速变化的拐点能准确判断粉喷桩的质量和加固深度。
The results show that the rational quality and strengthening depth could be detected with the SASW method;
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