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Impact and cyclic shaking on loose sand properties in laminar box using gap sensors

机译:间隙传感器对层流箱中松散砂性的冲击和周期性振动

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摘要

This paper focuses on using high-frequency GAP-SENSORs (GSs), accelerometers, and load cells in a laminar shear box (LSB) filled with loose Toyoura sand to understand the effects of impact loads and cyclic shaking at 1-G on soil properties. The shear wave velocity at small strain (V-s) was calculated directly from first arrival reference using displacement time-history of two GSs under impact loading. Moreover, from first peak using the reduced deformation amplitude technique, damping ratio was calculated. In addition, shaking table tests were performed under harmonic loading with amplitude of acceleration inside the model ground varying from 0.02 g to 1 g. The frequencies of excitation varied from 1 Hz to 10 Hz. GSs and inside accelerometers were used to directly measure the outside lateral deformation and shear stress at different elevations of LSB, respectively. Results show that the shear modulus (G) and the damping ratio (D) behavior of model sand are generally consistent with the behavior presented by similar tests using only accelerometers. In addition, damping ratio increases as frequency loading increases. Characteristic changes in two shear stress components in shaking loading conditions were also investigated using high precision inside load cells. (C) 2014 Elsevier Ltd. All rights reserved.
机译:本文重点研究在充满松散的Toyoura砂的层状剪切盒(LSB)中使用高频GAP传感器(GSs),加速度计和称重传感器,以了解冲击载荷和1-G循环震动对土壤特性的影响。 。使用两个GS在冲击载荷下的位移时程,从首次到达参考直接计算出小应变(V-s)下的剪切波速度。此外,使用减小的变形幅度技术从第一个峰计算阻尼比。此外,在谐波载荷下进行了振动台测试,模型地面内部的加速度幅度在0.02 g至1 g之间变化。激发频率从1 Hz到10 Hz不等。 GSs和内部加速度计分别用于直接测量LSB不同高度处的外部横向变形和切应力。结果表明,模型砂的剪切模量(G)和阻尼比(D)行为通常与仅使用加速度计的类似测试所显示的行为一致。另外,阻尼比随着频率负载的增加而增加。还使用高精度内部称重传感器研究了在振动载荷条件下两个剪切应力分量的特性变化。 (C)2014 Elsevier Ltd.保留所有权利。

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