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Continuous Monitoring of Bender Element Shear Wave Velocities During Triaxial Testing

机译：在三轴测试过程中连续监测弯曲单元剪切波速度

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摘要

Bender element testing is used to measure shear wave velocities (V_S) across soil specimens in the laboratory. Conventional bender element testing is carried out at a few discrete points during an experiment. This paper presents a method which uses bender elements to monitor V_S continuously throughout a triaxial test. The method is based on monitoring the change in phase angle between a continuous trigger signal and a received signal. It allows the phase velocity at multiple selected frequencies to be monitored throughout a test. The method is described in detail and its use is illustrated for triaxial tests on loose specimens of Fraser River sand prepared by water pluviation. The variation of shear wave velocity is demonstrated during consolidation, ageing, and shearing to failure along a conventional stress path. Potential difficulties of interpretation are presented and discussed. In addition, the potential for continuous excitation of the specimen to alter the test results is considered and dismissed based on a comparison of samples tested without benders and with continuous benders at a range of excitation voltages. The proposed method for continuously monitoring bender element shear wave velocities does not use special or unique equipment. It results in a continuous V_S from a trigger and receiver element installed on opposite ends of a triaxial specimen. This method provides a measure of V_S during dynamic phases of an experiment that have not previously been observed. For example, this paper includes measures of V_S at the onset of creep, the onset of shearing, and over the phase transformation from contractive to dilative behaviour. The relationship between fundamental soil behaviour and V_S can now be more easily explored.
机译：弯曲元件测试用于在实验室中测量土壤样品上的横波速度（V_S）。在实验过程中，传统的弯曲器元件测试是在几个离散点进行的。本文提出了一种在整个三轴测试中使用弯曲元件连续监控V_S的方法。该方法基于监视连续触发信号和接收信号之间的相角变化。它允许在整个测试过程中监视多个选定频率的相速度。详细介绍了该方法，并举例说明了其在通过水富处理法制备的弗雷泽河砂的松散标本上进行三轴试验的用途。在沿传统应力路径的固结，老化和剪切至破坏过程中，证明了剪切波速度的变化。提出和讨论了潜在的解释困难。另外，根据在一定激励电压范围内不使用弯曲机和使用连续弯曲机的测试样品的比较，考虑并消除了连续激发样品以改变测试结果的可能性。所提出的连续监测弯曲元件剪切波速度的方法没有使用特殊或独特的设备。它导致安装在三轴试样相对两端的触发和接收器元件产生连续的V_S。此方法提供了以前未观察到的动态阶段的V_S量度。例如，本文包括蠕变开始，剪切开始以及从收缩行为到扩张行为的相变过程中的V_S量度。现在可以更容易地探索基本土壤行为与V_S之间的关系。

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  • 来源
    《Geotechnical testing journal》 |2014年第2期|218-229|共12页
  • 作者

    Mark A. Styler; John A. Howie;

  • 作者单位

    Univ. of British Columbia, Department of Civil Engineering, Vancouver, BC, V6J2K2, Canada;

    Univ. of British Columbia, Department of Civil Engineering, Vancouver, BC, V6J2K2, Canada;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    bender elements; shear wave velocity; triaxial; sand;

    机译：弯曲元件;剪切波速度三轴砂;

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