Chemical Clay Soil Improvement: From Laboratory to Field Test

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• 作者：Jacopo De Rosa ; Dario M. Pontolillo ; Caterina Di Maio ; ^{caterina.dimaio@unibas.it" class="auth_mail" title="E-mail the corresponding author} ; Roberto Vassallo
• 关键词：Clay ; pore fluid composition ; shear strength ; landslide ; soil improvement ; KCl
• 刊名：Procedia Engineering
• 出版年：2016
• 出版时间：2016
• 年：2016
• 卷：158
• 期：Complete
• 页码：284-289
• 全文大小：453 K

文摘

Soil deterioration can be an important cause of earthflow activity. Current studies try to provide a deeper understanding of the processes that influence soil deterioration and of the processes that, on the contrary, can improve soil mechanical properties. This paper points out the role of the composition of pore fluid. In the m>Costa della Gavetam> slope, this is an aqueous ion solution, with concentration increasing with depth to values typical of seawater. Na⁺ is the prevailing cation, a reduction of its concentration causes dramatic decrease in strength. On the other side, the laboratory results show that exposure of the soil to KCl solutions, inducing an increase in pore K⁺ concentration, makes shear strength increase greatly and permanently. First results of chemical treatment by KCl columns at m>Costa della Gavetam> show that ion transport is faster than hypothesized on the basis of m>in situm> falling head permeability tests, probably because of preferential flow patterns along the slip surface and other discontinuities.