Liquefaction mechanisms of sand deposits with silt interlayer

IF 2.9 3区工程技术 Granular Matter Pub Date : 2025-02-05 DOI:10.1007/s10035-024-01494-4

Ye Yang, Mincai Jia

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Abstract

Liquefaction behaviors of sand deposits with impervious stratum are quite different from that of homogeneous geological conditions. However, the micro- liquefaction behaviors of the interlayered deposits have been infrequently documented. This study introduces a novel experimental methodology aimed at examining the influence of silt interlayer on the liquefaction mechanisms of sand deposits from both macro and micro perspectives. In the experiments, the Excess Pore Water Pressure (EPWP) was analyzed in conjunction with recorded micro liquefaction images. The migration mechanism of fine sand particles beneath the silt interlayer was revealed. The existence of low permeability interlayer leads to prolonged retention of EPWP beneath the silt interlayer. Substantially, the water film on the base of the interlayer is demonstrated to be the mixture of pore water and silt particles flowing with high velocity under seismic motions, thereby resulting in significant strain localization. An agminated zone of loose fine sand particles is usually generated beneath the silt interlayer after the dissipation of EPWP.

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粉砂夹层砂体液化机理研究

具有不透水地层的砂土液化行为与均匀地质条件下的砂土液化行为有很大不同。然而，关于层间沉积物的微液化行为却鲜有文献记载。本文介绍了一种新的实验方法，旨在从宏观和微观两个角度研究粉砂夹层对砂土液化机制的影响。在实验中，结合记录的微液化图像分析了超孔隙水压力（EPWP）。揭示了粉土夹层下细砂颗粒的运移机理。低渗透夹层的存在导致淤泥质夹层下EPWP滞留时间延长。实质上，夹层底部的水膜是孔隙水和淤泥颗粒在地震运动下高速流动的混合物，从而导致明显的应变局部化。EPWP耗散后，在粉土夹层下方通常会形成松散细沙颗粒的膨胀带。图形抽象

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来源期刊

Granular Matter MATERIALS SCIENCE, MULTIDISCIPLINARY-MECHANICS

CiteScore

4.30

自引率

8.30%

发文量

期刊介绍： Although many phenomena observed in granular materials are still not yet fully understood, important contributions have been made to further our understanding using modern tools from statistical mechanics, micro-mechanics, and computational science. These modern tools apply to disordered systems, phase transitions, instabilities or intermittent behavior and the performance of discrete particle simulations. >> Until now, however, many of these results were only to be found scattered throughout the literature. Physicists are often unaware of the theories and results published by engineers or other fields - and vice versa. The journal Granular Matter thus serves as an interdisciplinary platform of communication among researchers of various disciplines who are involved in the basic research on granular media. It helps to establish a common language and gather articles under one single roof that up to now have been spread over many journals in a variety of fields. Notwithstanding, highly applied or technical work is beyond the scope of this journal.