Stick-slip behaviours of dry glass beads in triaxial compression
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- 作者：Deshan Cui ; Wei Wu ; Wei Xiang ; Thiep Doanh ; Qiong Chen ; Shun Wang…
- 关键词：Stick ; slip ; Dry dense glass beads ; Triaxial compression ; Instabilities ; High confining stress ; Low strain rate
- 刊名：Granular Matter
- 出版年：2017
- 出版时间：February 2017
- 年：2017
- 卷：19
- 期：1
- 全文大小：2,732 KB
- 刊物类别：Physics and Astronomy
- 刊物主题：Physics
Granular Media
Industrial Chemistry and Chemical Engineering
Engineering Fluid Dynamics
Structural Foundations and Hydraulic Engineering
Engineering Thermodynamics and Transport Phenomena - 出版者：Springer Berlin / Heidelberg
- ISSN：1434-7636
- 卷排序：19
文摘
Consolidated undrained triaxial compression tests are conducted on standard cylindrical samples of nearly monodisperse glass beads, initially assembled in a dense state by a funnel pouring technique. Deviator stress, volumetric strain and induced pore air pressure are measured as functions of vertical strain under different confining stress and vertical strain rates. We find that in stick phase the glass beads accumulate energy and regain strength, which can lead to slow sliding in volumetric strain curve without stress drop in deviatoric stress curve for confining stress of 1000 kPa. Particularly after the previous slip event, as the deviatoric stress increases, the volume of sample repetitively compacts and then dilates before reaching the next slip events under high confining stress, which never happens at the lower. In slip phase, a stress drop coincides with a jump of volumetric strain and vertical strain, which make the pore air pressure grow sharply. The effects of confining stress and vertical strain rate on stick-slip instabilities are discussed in dry dense glass beads samples.