The traditional non-destructive method of pipe piles and concrete plates is impact-echo technique based on one-dimensional stress wave theory, and it can detect the big defects.
对管桩和混凝土板的传统无损检测方法则是基于一维波动理论的冲击回波方法，这种方法只能检测比较大的缺陷。
Then, the propagation of one-dimensional strain wave caused by the plate impact is investigated, and the attenuation of stress wave is evaluated.
然后研究了在平板撞击下的一维应变波的传播和衰减特性。
Firstly, the testing principle with axial precompression stress is re-examined based on one-dimensional wave theory.
首先按照一维应力波传播理论，对动静组合加载的试验原理进行理论论证。
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