Effects of internal erosion on the cyclic and post-cyclic mechanical behaviours of reconstituted volcanic ash
Effects of internal erosion on the cyclic and post-cyclic mechanical behaviours of reconstituted volcanic ash
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DOI：
10.1016/j.sandf.2022.101111
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发表时间：
2022-04
影响因子：
3.7
通讯作者：
S. Chitravel;M. Otsubo;R. Kuwano
中科院分区：
文献类型：
--
作者：
S. Chitravel;M. Otsubo;R. Kuwano
内部侵蚀是指由于渗流，土壤颗粒从地下主体结构内部或之下的运移。内部侵蚀影响土壤的力学和水力行为。本文研究了内侵蚀对日本佐津县火山灰循环和后循环力学行为的影响。利用侵蚀三轴装置对松散、中等和致密条件下的火山灰进行了一系列实验。此外，还考虑了循环加载后的再固结，以研究再固结对后循环力学行为的影响。结果表明，冲蚀后试件的循环抗力不受冲蚀细粉含量和初始相对密度的影响。冲蚀后试件的高循环阻力是由于冲蚀后晶间孔隙率的降低、组构的变化以及冲蚀过程中的预应变历史所致。循环加载对单调加载的临界状态摩擦角(Ucri)和峰值应力比R峰值的降低对冲蚀试件的影响较大。然而，再固结冲刷试件的ucri和RPeak增加，低于未冲刷试件和未加循环载荷的冲刷试件。这可能是由于循环加载期间土壤结构的变化，在循环加载后，侵蚀的积极影响消失了。这种有限的偏应力与变形的恢复是密度相关的。这是一篇CC BYNC-ND许可证(http://creativecommons.)下的开放访问文章Org/许可证/by-nc-nd/4.0/)。
Internal erosion is the transportation of soil particles from within or beneath the main structure inside the ground due to seepage flow. Internal erosion impacts the mechanical and hydraulic behaviour of soil. The present study investigates the impact of internal erosion on the cyclic and post-cyclic mechanical behaviours of volcanic ash sampled from Satozuka, Japan. A series of experiments using volcanic ash with loose, medium, and dense conditions have been performed using an erosion triaxial apparatus. Further, reconsolidation after application of cyclic loading was considered to study the impact of reconsolidation on the post-cyclic mechanical behaviour. The results show that the cyclic resistance of eroded specimens is improved regardless of the percentage of eroded fines and the initial relative density. The higher cyclic resistance for the eroded specimens is found to be due to a decrease in the intergranular void ratio after the erosion, change in fabric, and pre-strain history during erosion. Reduction in the critical state friction angle (ucri) and peak stress ratio ðRpeak) for the monotonic loading due to cyclic loading is greater for the eroded specimens. However, reconsolidated eroded specimens show increases in ucri and Rpeak, which are lower than those of the non-eroded and eroded specimens without cyclic loading. This could be due to the change in the soil fabric during cyclic loading where the positive impact of erosion is lost after cyclic loading. Such limited recovery of deviatoric stress with deformation is density-dependent.© 2021 Production and hosting by Elsevier BV on behalf of The Japanese Geotechnical Society. This is an open access article under the CC BYNC-ND license (http://creativecommons. org/licenses/by-nc-nd/4.0/).