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振动加载过程中砂土液化引起的声发射

Acoustic emission induced by sand liquefaction during vibration loading.

作者信息

Frid Vladimir, Shulov Semen

机构信息

Civil Engineering Department, Sami Shamoon College of Engineering, 84 Jabotinsky St., Ashdod, Israel.

出版信息

Sci Rep. 2022 Oct 7;12(1):16881. doi: 10.1038/s41598-022-21257-6.

DOI:10.1038/s41598-022-21257-6
PMID:36207397
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9546850/
Abstract

The article deals with the study of poorly graded sand samples of different grain content subjected to liquefaction. The research results show the V-shaped behavior of the AE parameters that correspond to the three-stage sand behavior: Phase A is associated with microfractures/displacements between sand grains caused by an increase in pore pressure before the liquefaction point. Phase B (the stage of AE silence just before the liquefaction point) reflects the equality between pore pressure and stress in the confining chamber. Phase C (the stage of increase in AE parameters' values) is explained by intense friction between sand grains during their movement caused by liquefaction. Our results show that the AE behavior before, at, and after the liquefaction point is significantly affected by the sand grain content. The change in the sand composition from the poorly graded dune sand to "extremely poorly graded sand" significantly increases the time for the creation of the liquefaction state while the coarser the sand grains become, the longer duration of vibration loading is required to reach the liquefaction state.

摘要

本文研究了不同颗粒含量的级配不良砂样的液化情况。研究结果表明，声发射（AE）参数呈V形变化，对应于砂样的三个阶段行为：A阶段与液化点之前孔隙压力增加导致的砂粒间微裂缝/位移有关。B阶段（就在液化点之前的AE沉默阶段）反映了孔隙压力与围压室应力之间的平衡。C阶段（AE参数值增加阶段）是由于液化导致砂粒运动时的剧烈摩擦所致。我们的结果表明，液化点之前、之时和之后的AE行为受砂粒含量的显著影响。砂的组成从级配不良的沙丘砂变为“极级配不良砂”时，显著增加了形成液化状态的时间，而且砂粒越粗，达到液化状态所需的振动加载持续时间就越长。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/514a/9546850/c2a620afcc70/41598_2022_21257_Fig12_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/514a/9546850/3435ed68ad55/41598_2022_21257_Fig1_HTML.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/514a/9546850/47e2e705a9c7/41598_2022_21257_Fig5_HTML.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/514a/9546850/70a010a736b7/41598_2022_21257_Fig7_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/514a/9546850/f40a67401a70/41598_2022_21257_Fig8_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/514a/9546850/0c05b34ac3a9/41598_2022_21257_Fig9_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/514a/9546850/5ab5604d76e3/41598_2022_21257_Fig10_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/514a/9546850/35492f16786b/41598_2022_21257_Fig11_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/514a/9546850/c2a620afcc70/41598_2022_21257_Fig12_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/514a/9546850/3435ed68ad55/41598_2022_21257_Fig1_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/514a/9546850/43cc405cc454/41598_2022_21257_Fig2_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/514a/9546850/309ff7852ade/41598_2022_21257_Fig3_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/514a/9546850/9c6ee7ab613c/41598_2022_21257_Fig4_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/514a/9546850/47e2e705a9c7/41598_2022_21257_Fig5_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/514a/9546850/430f60e26863/41598_2022_21257_Fig6_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/514a/9546850/70a010a736b7/41598_2022_21257_Fig7_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/514a/9546850/f40a67401a70/41598_2022_21257_Fig8_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/514a/9546850/0c05b34ac3a9/41598_2022_21257_Fig9_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/514a/9546850/5ab5604d76e3/41598_2022_21257_Fig10_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/514a/9546850/35492f16786b/41598_2022_21257_Fig11_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/514a/9546850/c2a620afcc70/41598_2022_21257_Fig12_HTML.jpg

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本文引用的文献

1
Use of acoustic emission to evaluate the micro-mechanical behavior of sands in single particle compression tests.利用声发射技术评估单颗粒压缩试验中砂的微观力学行为。
Ultrasonics. 2019 Nov;99:105962. doi: 10.1016/j.ultras.2019.105962. Epub 2019 Jul 13.
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