A NON-RESONANCE METHOD FOR MEASURING DYNAMIC SOIL PROPERTIES
A NON-RESONANCE METHOD FOR MEASURING DYNAMIC SOIL PROPERTIES
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DOI：
10.1520/gtj12125
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发表时间：
2005
影响因子：
1.6
通讯作者：
G. Rix;J. Meng
中科院分区：
文献类型：
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作者：
G. Rix;J. Meng
引入非共振 (NR) 测试方法，使用传统的共振柱/扭剪 (RC/TS) 装置确定宽频率范围内低应变振幅下的动态土壤特性。介绍了 NR 方法的理论背景，并表明剪切模量和材料阻尼比可以通过施加的扭矩和由此产生的样本旋转位移之间的频率响应测量来获得。通过正确考虑惯性效应，NR 方法允许在频率（例如 2-30 Hz）下进行测量，填补了传统 RC 和 TS 测试之间的空白。给出了铝合金、聚甲基丙烯酸甲酯 (PMMA) 和土壤样本在 0.01–30 Hz 频率范围内的实验结果。使用 NR 方法获得的用作校准材料的铝合金和 PMMA 的值与文献中的参考值非常吻合，有助于验证该方法。对两个土壤样本的测试表明，NR 方法允许在较宽的频率范围内连续测量土壤的剪切模量和材料阻尼比，这有可能加深对粘弹性土壤行为的理解，并提供适合各种自然和人为振动源的频率范围内的动态土壤特性。
A non-resonance (NR) test method is introduced to determine dynamic soil properties at low strain amplitudes over a broad frequency range using a conventional resonant column/torsional shear (RC/TS) apparatus. The theoretical background of the NR method is presented and it is shown that the shear modulus and material damping ratio can be obtained from frequency response measurements between the applied torque and resulting rotational displacement of the specimen. By properly accounting for inertia effects, the NR method allows measurements at frequencies (e.g., 2–30 Hz) that fill the gap between conventional RC and TS tests. Experimental results are presented for aluminum alloy, polymethyl methacrylate (PMMA), and soil specimens over the frequency range of 0.01–30 Hz. Values for aluminum alloy and PMMA, used as calibration materials, obtained with the NR method agree well with reference values from the literature and help validate the approach. Tests on two soil specimens indicate that the NR method permits continuous measurements of shear modulus and material damping ratio of soils over a broad frequency range, which has the potential to yield improved understanding of viscoelastic soil behavior and provide dynamic soil properties over a range of frequencies appropriate for a variety of natural and man-made vibration sources.