| 赵博雅,邵龙潭*,孙翔,郭晓霞,刘港.基于数字图像测量技术的尾粉砂动三轴试验研究[J].实验力学,2018,33(2):175~182 |
| 基于数字图像测量技术的尾粉砂动三轴试验研究 |
| On the dynamic triaxial experiment of tailings silty sand based on digital image measurement |
| 投稿时间：2017-01-12 修订日期：2017-03-03 |
| DOI：10.7520/1001-4888-17-009 |
| 中文关键词: 数字图像测量技术 动三轴试验 动弹性模量 动应变 |
| 英文关键词:digital image measurement dynamic triaxial test dynamic modulus dynamic strain |
| 基金项目:国家自然科学基金(51309047)资助 |
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| 中文摘要: |
| 尾粉砂的动力学特性往往通过室内动三轴试验来进行研究，因此试验数据的精度尤为重要。本文将数字图像测量技术应用于土工动三轴试样的应变测量中。采用Butterworth数字滤波器进行数据降噪处理，并将图像测量获得的整体应变结果与传感器测量的应变结果进行了比较，表明通过图像测量方法测得的数据更能反映试样的真实变形。以某地饱和尾粉砂动三轴试验为例，通过采用该种非接触式测量方法，分别得到试样局部的动位移和动应变，进而得到动模量随动应变的变化规律，并与传感器得到的数据进行比较,结果表明，局部的动模量分布在整体动模量衰减曲线周围，并且在小变形下不同位置处其动模量与整体动模量差别较大，应变较大时，局部动模量趋于整体动模量。 |
| 英文摘要: |
| Dynamic characteristics of tailings silty sand are often studied by indoor dynamic triaxial experiment, so the accuracy of experimental data is very important. In this paper, digital image correlation technique is applied to strain measurement of triaxis dynamic specimens of geotechnical engineering. Butterworth digital filter was used to denoise data, and overall strain measurement results by DIC were compared with that obtained by using transducers, which demonstrates that the data obtained by DIC measurement can more truly reflect the deformation. Taking dynamic triaxis experiment of somewhere saturated tailings silty sand as an example, the local dynamic displacement and strain of specimens were obtained respectively based on this non-contact measurement method. Then, the variation pattern of dynamic modulus with dynamic strain was also obtained, which was compared with that obtained by transducers. Results show that local dynamic modulus is distributed around the attenuation curve of overall dynamic modulus. Moreover, under small deformation condition, the local dynamic modulus is greatly different from the overall dynamic modulus at different locations. When strain is larger, the local dynamic modulus is closer to overall dynamic modulus. |
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