能量变化下砂质粉土的冲击液化机理

IF 1.3 4区 工程技术 Q3 ENGINEERING, GEOLOGICAL
C. Dong, Z. Duan, Renwei Li, Jiang Li, Heng Li, Nianqin Wang, Jian-bing Peng, Xin Chen
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引用次数: 2

摘要

滑坡路径上沉积物的冲击液化会减小滑面摩擦力,导致滑坡的速度和距离增加。本研究采用自行设计的冲击液化试验,探讨了不同冲击能量作用下土的压力发展规律。通过核磁共振(NMR)和扫描电子显微镜(SEM)的方法揭示了微观机制。结果表明:土体中层孔隙水压力高于上层和底层孔隙水压力;这些部位孔隙水压力变化相对稳定,峰值压力随冲击能量线性增大。砂质粉土中大孔隙的崩塌是砂质粉土产生高孔隙水压力的主要原因。但当土壤受到高能冲击时,中孔和小孔被压缩和堵塞,也会刺激孔隙水压力。结果还表明,在快速冲击作用下,砂质粉土的排水特性较弱。当冲击能量足够时,砂质粉土孔隙水压力抑制了耗散,导致砂质粉土内部快速液化。补充资料:https://doi.org/10.6084/m9.figshare.c.6655482
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Impact liquefaction mechanism of sandy silt under energy change
The impact liquefaction of sediments in the path of a landslide would reduce the friction of sliding surface, leading to increase in the speed and distance of the landslide. In this study, a self-designed impact-liquefaction test was used to explore the pressure development of soil under the effect of different impact energies. The microscopic mechanisms were unravelled by using Nuclear Magnetic Resonance (NMR) and Scanning Electron Microscope (SEM) methods. The results show that the soil at the middle depth shows higher pore water pressure than at the top and bottom of the layer. Furthermore, the variation of pore water pressure in these parts is relatively stable, and the peak pressure linearly increases with impact energy. The collapse of large pores in sandy silt is the primary reason for the generation of high pore water pressures in sandy silt. But when the soils are high-energy impacted, the mesopores and small-pores are compressed and blocked, which also stimulate the pore water pressure. The result also demonstrates weak drainage behaviour of sandy silt under rapid impacting. If the impact energy is sufficient, the pore water pressure in sandy silt suppresses the dissipation, causing quick liquefaction in the interior of the sandy silt. Supplementary material: https://doi.org/10.6084/m9.figshare.c.6655482
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来源期刊
CiteScore
3.40
自引率
14.30%
发文量
66
审稿时长
6 months
期刊介绍: Quarterly Journal of Engineering Geology and Hydrogeology is owned by the Geological Society of London and published by the Geological Society Publishing House. Quarterly Journal of Engineering Geology & Hydrogeology (QJEGH) is an established peer reviewed international journal featuring papers on geology as applied to civil engineering mining practice and water resources. Papers are invited from, and about, all areas of the world on engineering geology and hydrogeology topics. This includes but is not limited to: applied geophysics, engineering geomorphology, environmental geology, hydrogeology, groundwater quality, ground source heat, contaminated land, waste management, land use planning, geotechnics, rock mechanics, geomaterials and geological hazards. The journal publishes the prestigious Glossop and Ineson lectures, research papers, case studies, review articles, technical notes, photographic features, thematic sets, discussion papers, editorial opinion and book reviews.
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