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桩的质量用动力试验可以很快地检查出来,这只要用锤在桩的上端敲击使桩发生振动。能从振动图形断定这桩是否严重颈缩或中断了,以及在地基土层里的埋藏情况。与静载试验相比还可以按动力试验的结果来估计桩的承载能力。至目前,这些关系在许多压桩试验中被检验。本文提供了用静拉法和用动力法的桩的类似试验的比较资料。在拉桩的长度与振动频率及振幅之间可以建立起一个清楚的关系。在动力试验的结果和受拉桩的承载能力之间还找到了明确的关系。
The quality of the pile can be quickly checked by the dynamic test, which is done by hammering the pile at the upper end of the pile. It is possible to determine from the vibration pattern whether the pile is severely necked or interrupted, as well as the burial in the foundation soil. Compared with the static load test can also be based on the results of dynamic test to estimate the bearing capacity of the pile. To date, these relationships have been tested in many piling tests. This article provides comparative data on similar tests of piles using static and dynamic methods. A clear relationship can be established between the length of the piles and the vibration frequency and amplitude. A clear relationship has also been found between the results of the dynamic test and the carrying capacity of tensioned piles.