首页> 外文期刊>Geotechnical testing journal >Shear Modulus and Damping Ratio of Unsaturated Kaolin Measured by New Suction-Controlled Cyclic Triaxial Device
【24h】

Shear Modulus and Damping Ratio of Unsaturated Kaolin Measured by New Suction-Controlled Cyclic Triaxial Device

机译:新型抽吸控制循环三轴仪测量不饱和高岭土的剪切模量和阻尼比

获取原文
获取原文并翻译 | 示例
       

摘要

The cyclic triaxial test is the most widely used way to measure the cyclic stress-strain properties of saturated soils because of its availability in most geotechnical laboratories. Further, it can be viewed as a suitable tool with which to analyze the cyclic behavior of unsaturated soils in a wide strain range. In this study, a new stress path suction-controlled cyclic triaxial device is presented. It is fitted for suction-controlled testing by the axis-translation technique. Pore-air and pore-water pressures are applied at the top and bottom of the specimen by using two electro-pneumatic regulators. The capability of the new apparatus is demonstrated in this paper with the results of some suction-controlled cyclic triaxial tests. The tests are carried out on compacted specimens of lean clay that are prepared in the same initial condition and tested following different stress paths. The stress paths include suction equalization, constant suction ramped isotropic compression, series of constant suction cyclic loading, and post-cyclic constant suction ramped isotropic compression stages. Volumetric behavior and evolution of the yield curves along suction equalization, constant suction ramped isotropic compression, and post-cyclic compression stages are discussed on the basis of the Barcelona Basic Model elasto-plastic framework. The stiffness and damping ratio of the specimens are subsequently presented, highlighting the dependency of the Young's modulus (E), shear modulus (G), and damping ratio (D) on the shear strain amplitude, number of cycles, and suction. The results show that E and G increase, whereas D decreases significantly by increasing suction at similar strain levels and number of cycles.
机译:循环三轴试验是测量饱和土循环应力-应变特性的最广泛使用的方法,因为它在大多数岩土工程实验室中都可以使用。此外,它可以被视为分析宽应变范围内非饱和土循环特性的合适工具。在这项研究中,提出了一种新的应力路径吸入控制的循环三轴装置。它适用于通过轴平移技术进行吸力控制的测试。通过使用两个电动气动调节器,在样品的顶部和底部施加孔隙压力和孔隙水压力。本文通过一些抽吸控制的循环三轴试验的结果证明了这种新仪器的功能。对在相同初始条件下制备并按照不同应力路径测试的贫化粘土压实样品进行测试。应力路径包括吸力均衡,恒定吸力斜向各向同性压缩,一系列恒定吸力循环载荷以及循环后恒定吸力斜向各向同性压缩阶段。在巴塞罗那基础模型弹塑性框架的基础上,讨论了沿吸力均衡,恒定吸力斜向各向同性压缩和循环后压缩阶段的体积行为和屈服曲线的演变。随后介绍了样品的刚度和阻尼比,强调了杨氏模量(E),剪切模量(G)和阻尼比(D)对剪切应变幅度,循环次数和吸力的依赖性。结果表明,在相似的应变水平和循环次数下,通过增加吸力,E和G显着降低,而D显着降低。

著录项

  • 来源
    《Geotechnical testing journal》 |2011年第5期|p.525-536|共12页
  • 作者单位

    Ph.D. Student, Depart. of Geotechnical Engineering, International Institute of Earthquake Engineering and Seismology, Tehran, Iran;

    Professor, Depart. of Geotechnical Engineering, International Institute of Earthquake Engineering and Seismology, Tehran, Iran;

    Assistant Professor. Depart, of Geotechnical Engineering, International Institute of Earthquake Engineering and Seismology, Tehran, Iran;

    Professor, Depart. of Geotechnical Engineering, Dipartimento di Ingegneria Idraulica, Geotecnica ed Ambientale at the University of Naples Federico II,Napoli, Italy;

    Professor, Depart. of Geotechnical Engineering, Dipartimento di Ingegneria Idraulica, Geotecnica ed Ambientale at the University of Naples Federico II,Napoli, Italy;

  • 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

    unsaturated kaolin; shear modulus; damping ratio; suction-controlled cyclic triaxial device; number of cycles;

    机译:非饱和高岭土;剪切模量;阻尼比;吸力控制三轴装置;循环次数;
  • 入库时间 2022-08-18 00:11:58

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号