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On the role of pore pressure in dynamic instabilities of saturated model granular materials

机译：孔隙压力在饱和模型颗粒材料动态造型中的作用

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Drained triaxial axisymmetric isotropic and subsequently shear compression tests are performed on fully water-saturated short cylindrical samples of nearly monodisperse glass beads, initially assembled in a loose state by moist tamping and undercompaction technique. Both fully drained isotropic and shear tests are affected by dynamic instabilities triggered under uncontrolled isotropic or deviatoric stress. These dynamic instabilities encompass isotropic collapses, compression stick-slips and especially the unexpected isotropic liquefaction. The most reasonable but imprecise scenario points to a possible dynamical collapse of the granular structure triggered by a spontaneous failure of the force chains, generating an instantaneous surge of excess pore pressure in a fully saturated system. This paper aims in exploring the key role of pore pressure outburst on some global macroscopic parameters of these dynamic events. It focuses on the unforeseen, short-lived and stabilised excess dynamic pore pressure and proposes an in-depth assessment of the validity and the reliability of pore pressure measurements. Irrespective of loading condition (i.e. isotropic or drained compression shear) the ephemeral stabilised excess dynamic pore pressure controls the evolution of the axial and volumetric strains in an essentially dynamic consolidation process. Some appearance conditions for these unexpected dynamic instabilities are discussed.
机译：排出的三轴轴对称各向同性和随后的剪切压缩试验在几乎单分散的玻璃珠的完全水饱和的短圆柱形样品上进行，最初通过湿润夯实和底部分离技术组装在松散状态下。完全排水的各向同性和剪切测试都受到在不受控制的各向同性或偏离的压力下触发的动态不稳定性的影响。这些动态稳定性包括各向同性折叠，压缩棒滑动，特别是意想不到的各向同性液化。最合理但不精确的情况指向由力链的自发性故障引发的粒状结构的可能动态塌陷，在完全饱和的系统中产生过量孔隙压力的瞬时喘振。本文旨在探讨孔隙压力突出在这些动态事件的一些全球宏观参数的关键作用。它侧重于不可预见，短暂的和稳定的过量动态孔隙压力，并提出对孔隙压力测量的有效性和可靠性的深入评估。无论加载条件（即各向同性或排出的压缩剪切），短暂稳定的过量动态孔隙压力控制在基本动态的固结过程中轴向和体积菌株的演变。讨论了这些意外的动态不稳定性的一些外观条件。

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