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多孔介质中渗流致细颗粒运移实验探讨
Authors
张旭辉
王晶
罗大双
鲁晓兵
Publication date
13 August 2017
Publisher
Abstract
多孔介质中渗流引起的细颗粒运移是自然界普遍存在的现象,如管涌、油气开采中的出砂等。细颗粒在多孔介质孔隙内的冲刷、重沉积以及多孔介质的变形是典型的流-固耦合力学问题。本文以粉细砂、钙质砂、人工砂和塑料砂等不同颗粒级配和细颗粒含量的土体类型为实验介质,采用圆柱形有机玻璃管模拟一维渗流致出砂,探讨岩土中渗流导致出砂的基本现象和特征,分析了细颗粒含量和渗流压差对出砂的影响。实验结果表明:颗粒级配及细颗粒含量确定土体骨架的孔隙结构及颗粒间相互作用形式,在一定渗流压差下,渗流致出砂主要取决于多孔介质孔隙大小以及细颗粒占比;对于某一颗粒级配,可以发生出砂的情况下,出砂量与渗流压差呈现正相关,渗流压差越大,出砂程度越高
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Institute Of Mechanics,Chinese Academy of Sciences
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Last time updated on 09/01/2019