二维实验评估砂-粘土混合物中相互作用能引发的窒息现象

Jongmuk Won, Incheol Joo
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引用次数: 0

摘要

渗流可定义为间隙分级土壤中相对较小的土壤颗粒在没有任何体积变化的情况下流失。本研究通过实验室规模的二维流动池,研究了砂-粘土混合物中相互作用能诱发窒息的敏感性。在三个出口测量了注入过程中被过滤的粘土,以评估重力和再附着效应与粘土类型(高岭石、伊利石和膨润土)和砂粒度的函数关系。研究发现,分离的粘土颗粒在砂介质中的沉降和输送过程中的再附着效应与粘土的膨胀势以及砂和粘土的粒度比密切相关。此外,出口处观察到的粘土粒度分布表明,相对较小和较大的粘土颗粒分别容易受到非膨胀和膨胀粘土的挤压。通过比较二维流动池和典型土柱实验(一维流动)的滤出粘土总量,发现用土柱实验来评估砂-粘土混合物的淤积情况很有可能被低估。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Two-dimensional experimental assessment of interaction energy-induced suffusion in sand-clay mixtures
Suffusion can be defined as the loss of relatively small soil particles in gap-graded soils without any volume change. This study investigates the susceptibility of interaction energy-induced suffusion in sand-clay mixtures through laboratory-scale two-dimensional flow cell. The filtrated clay during the injection was measured at three outlets to assess the gravity and reattachment effects as a function of clay type (kaolinite, illite, and bentonite) and sand grain size. It was found that the settling of detached clay particles and the reattachment effect during their transport through the sand medium is a strong function of the swelling potential of clay and the size ratio between sand and clay. In addition, observed particle size distributions of clay at the outlet demonstrated that the relatively small and large clay particles are susceptible to suffusion for non-swelling and swelling clay respectively. The comparison of total filtrated clay between two-dimensional flow cell and the typical soil-column experiments (one-dimensional flow) revealed a high chance of underestimating suffusion using soil-column experiments to assess the suffusion of sand-clay mixtures.
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