高应变动力试桩法检测桩长
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摘要
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。
Under the impact of a large hammer, a high signal noise ratio of the force and velocity can be acquired in the high-strain dynamic testing. In fact, an accurate two-way time of the reflection wave △t can be acquired too, because a reliable toe echo can be obtained from the field curves. According to the time distance equation L=C× △t / 2, if a P-wave speed is given,a reliable pile length L can be got. In addition,this paper discusses the P-wave speed of the pipe pile. And a conclusion C≈4100 m/a is drawn.
Under the impact of a large hammer, a high signal noise ratio of the force and velocity can be acquired in the high-strain dynamic testing. In fact, an accurate two-way time of the reflection wave △t can be acquired too, because a reliable toe echo can be obtained from the field curves. According to the time distance equation L=C× △t / 2, if a P-wave speed is given,a reliable pile length L can be got. In addition,this paper discusses the P-wave speed of the pipe pile. And a conclusion C≈4100 m/a is drawn.
引文
1雷林源．桩基瞬态动测响应的数学模型及基本特性．地球物理学报，1992，35（4）：501～5092徐攸在，刘兴满．动力测桩新技术．北京：中国建筑工业出版社，1989．290～3043何樵登．地震勘探原理和方法．北京：地质出版社，1986．77～97
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