Small-strain shear modulus and liquefaction resistance of calcareous sand with non-plastic fines

Jian Hu, Yang Xiao, Jinquan Shi, A. Stuedlein, T. M. Evans
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Abstract

Incorporation of nonplastic fines can dramatically affect the liquefaction resistance and stiffness of sands. This study aims to evaluate the influence of nonplastic fines on the liquefaction resistance and small-strain shear modulus of calcareous sand under cyclic loading. Forty-seven sets of undrained cyclic triaxial tests and companion bender element tests are conducted on reconstituted specimens. The cyclic behavior of clean sand and silty sand with varying fines content is examined with respect to the global void ratio, relative density, and granular skeleton void ratio. The findings demonstrate that the microscopic contacts between coarse and fine grains have a significant impact on the macroscopic behavior of sand-fines mixtures. The experimental findings are evaluated using the equivalent granular skeleton void ratio, which has been recognized as a suitable parameter to describe the overall effect of fines. The findings on calcareous sand with fines are supplemented and compared with published data in accordance with the semiempirical simplified approach for liquefaction triggering based on shear wave velocity.
含非塑性细粒的钙质砂的小应变剪切模量和抗液化性能
非弹性细粒的加入会极大地影响砂的抗液化性和刚度。本研究旨在评估非弹性细粒对循环加载下钙质砂抗液化性和小应变剪切模量的影响。对重组试样进行了 47 组无排水循环三轴试验和配套的弯管元件试验。针对整体空隙率、相对密度和颗粒骨架空隙率,研究了不同细粒含量的洁净砂和淤泥砂的循环行为。研究结果表明,粗粒和细粒之间的微观接触对砂-细粒混合物的宏观行为有重大影响。实验结果使用等效粒状骨架空隙率进行评估,该参数被认为是描述细粒整体影响的合适参数。根据基于剪切波速度的液化触发半经验简化方法,对含细粒钙质砂的研究结果进行了补充,并与已公布的数据进行了比较。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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