• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Granular matter >Unexpected liquefaction under isotropic consolidation of idealized granular materials
【24h】

Unexpected liquefaction under isotropic consolidation of idealized granular materials

机译：理想化颗粒材料各向同性固结下的意外液化

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The drained isotropic compression behaviour of very loose and fully saturated monodisperse glass beads in triaxial compression is investigated in this paper. Short cylindrical samples were prepared by moist-tamping technique and isotropically compressed in a classical axisymmetric triaxial machine. Very loose glass bead samples exhibit numerous local collapses with sudden volumetric compaction and axial contraction of very large amplitude and experience ultimately global collapse with spontaneous liquefaction under undetermined external isotropic stress. Excess pore pressure instantaneously generated at the beginning of the collapse phenomenon, and rapidly dissipated with the usual drainage system, shows a global complex system with local dynamic instability. The dynamic time evolution of the excess pore pressure Delta U consists in a first and fast transient phase I at constant volume and constant axial strain with large spikes Delta U-peak, followed by an intermediate second phase II of large increase of volumetric compaction and axial contraction at stabilizing Delta U-stable or constant effective stress sigma' and finally a third and longest phase III of excess pore water pressure dissipation at nearly constant axial strain toward the initial back-pressure. For local collapses, the second phase is totally missing. Upon ignoring the local collapses, very loose idealized granular materials have a unique and global isotropic compressibility behaviour, independently of the void ratio at the end of the fabrication stage; and liquefaction-free for dense state below a threshold void ratio at fabrication e(30)(liq), representing the transition from global instability with total failure to local instability with partial collapse. This paper provides the first reported spontaneous liquefaction instability under isotropic consolidation. It gives the necessarily conditions for an isotropic liquefaction and emphases some usually hidden or partially developed mechanisms underlying the diffuse instability phenomenon and adds a new intriguing layer to the complex behaviour of idealized granular materials in classical drained triaxial isotropic compression.
机译：本文研究了非常松散且完全饱和的单分散玻璃珠在三轴压缩下的排水各向同性压缩行为。短圆柱样品通过湿夯技术制备，并在经典轴对称三轴机械中各向同性压缩。极松散的玻璃珠样品表现出大量局部塌陷，并伴有突然的体积压缩和非常大的轴向收缩，最终在未确定的外部各向同性应力下经历了自发液化的整体塌陷。坍塌现象开始时瞬间产生的超高孔隙压力，并通过常规的排水系统迅速消散，显示出具有局部动态不稳定的整体复杂系统。过量孔隙压力Delta U的动态时间演化包括处于恒定体积和恒定轴向应变且峰值尖峰ΔU峰较大的第一快速瞬变阶段I，随后是体积压实度和轴向增大较大的中间第二阶段II在稳定的Delta U稳定或恒定有效应力sigma'的作用下收缩，最后在向初始背压几乎恒定的轴向应变下，第三和最长的第三阶段多余的孔隙水压力耗散。对于局部坍塌，第二阶段完全消失了。当忽略局部塌陷时，非常松散的理想化颗粒材料具有独特的全局各向同性可压缩性，而与制造阶段结束时的空隙率无关。且在制造e（30）（liq）时低于阈值空隙率的致密状态下无液化，代表从整体失稳的整体失稳过渡到局部失稳的局部失稳。本文提供了第一个报告的各向同性固结下的自发液化不稳定性。它为各向同性液化提供了必要条件，并强调了一些通常为隐藏的或部分发展的机制，这些机制是弥散不稳定性现象的基础，并为理想的粒状材料在经典排水三轴各向同性压缩中的复杂行为添加了新的有趣的层。

著录项

  • 来源
    《Granular matter》 |2016年第3期|67.1-67.25|共25页
  • 作者

    Doanh T.; Abdelmoula N.; Nguyen T. T. T.; Hans S.; Boutin C.; Le Bot A.;

  • 作者单位

    Ecole Natl Travaux Publ Etat LGCB, LTDS UMR 5513, 2 Rue M Audin, F-69518 Vaulx En Velin, France;

    Ecole Natl Travaux Publ Etat LGCB, LTDS UMR 5513, 2 Rue M Audin, F-69518 Vaulx En Velin, France;

    Ecole Natl Travaux Publ Etat LGCB, LTDS UMR 5513, 2 Rue M Audin, F-69518 Vaulx En Velin, France;

    Ecole Natl Travaux Publ Etat LGCB, LTDS UMR 5513, 2 Rue M Audin, F-69518 Vaulx En Velin, France;

    Ecole Natl Travaux Publ Etat LGCB, LTDS UMR 5513, 2 Rue M Audin, F-69518 Vaulx En Velin, France;

    Ecole Cent Lyon, LTDS UMR 5513, 36 Ave Guy De Collongue, F-69134 Ecully, France;

  • 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

    Liquefaction; Diffuse instability; Idealized granular materials; Isotropic consolidation; Friction; Dynamic;

    机译：液化扩散不稳定性理想的粒状材料各向同性固结摩擦动态;

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