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高应变动力试桩法采用数吨重锤锤击，同时实测了桩顶的力信号和速度信号，具有很高的信噪比。在桩基质量检测中，均能获得可靠的桩底反射信息，如获得准确的反射波双程旅行时△ｔ，给定应力波波速Ｃ，即可据时距方程Ｌ＝Ｃ×△ｔ／２求出桩长Ｌ。并讨论了预应力管桩的应力波纵波平均波速，其值约为４１００ｍ／ｓ。
The high-strain dynamic trial pile method uses several tons of hammer to hammer, and at the same time measured the force signal and velocity signal at the top of the pile, and has a high signal-to-noise ratio. In the quality inspection of pile foundation, reliable bottom pile reflection information can be obtained. For example, when the accurate reflection wave is in two-way travel, △t, given the stress wave speed C, it can be calculated according to the time equation L=C×△t/ 2 Find the pile length L. The mean wave velocity of the longitudinal wave of the stress wave of the prestressed pipe pile is discussed. Its value is about 4100m/s.