水化学环境对湛江组黏土结构强度的影响研究

发布时间：2018-01-14 13:02

本文关键词：水化学环境对湛江组黏土结构强度的影响研究　出处：《岩土工程学报》2017年11期 　论文类型：期刊论文

【摘要】：为研究水化学环境对湛江组黏土结构强度的影响,收集湛江地区地下水水文地质资料,并通过钻孔取水进行化学分析,分析该区地下水的化学环境与影响因素;利用离心过滤法提取土中水溶液,调查土中溶液的化学成分与特性;在此基础上,采用选择溶解法去除土中胶结物质,利用扫描电子显微镜与能谱分析,对比分析去除胶结物质前后的微观结构变化。研究表明:湛江地区的地下水与湛江组黏土中水溶液的化学构成与比例含量基本一致,水化学类型为Cl-Na型,表现出偏酸性与富含铁离子的特征,水中大量的铁为土颗粒的联结提供了胶结物质,酸性环境促使游离氧化铁产生胶结效果进而提高土的结构强度。最后,提出了考虑地下水环境影响的湛江组黏土结构强度的形成机理,研究表明湛江组黏土较强的结构性源于开放式的絮凝结构加上颗粒间的强胶结作用。
[Abstract]:In order to study the influence of hydrochemical environment on the structural strength of clay in Zhanjiang formation, the hydrogeological data of groundwater in Zhanjiang area were collected, and the chemical environment and influencing factors of groundwater in Zhanjiang area were analyzed by means of chemical analysis. The aqueous solution of soil was extracted by centrifugal filtration, and the chemical composition and characteristics of the solution were investigated. On this basis, the selective dissolution method was used to remove the cemented substance in the soil, and the scanning electron microscope and energy spectrum were used to analyze it. The results show that the chemical composition and proportion of groundwater in Zhanjiang area is basically the same as that of aqueous solution in Zhanjiang formation clay. The type of hydrochemistry is Cl-Na type, which shows the characteristics of partial acidity and rich in iron ions. A large amount of iron in water provides cementing materials for the bonding of soil particles. Acidic environment promotes free iron oxide to produce cementing effect and then improves the structural strength of soil. Finally, the formation mechanism of structural strength of Zhanjiang formation clay considering the influence of groundwater environment is put forward. The results show that the strong structure of Zhanjiang formation clay is due to open flocculation structure and strong cementation between particles.
【作者单位】：中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室;吉林大学建设工程学院;
【基金】：国家自然科学基金项目(41672293;41402277) 2016年中国科学院大学生创新实践训练计划项目
【分类号】：TU442
【正文快照】： 土的结构性是指土中颗粒或颗粒集合体以及它们之间孔隙的大小、形状、排列组合及联结等综合特征[1]。沈珠江指出,土的结构性模型的建立将成为21世纪土力学的核心问题[2]。这是因为从微观结构角度研究土的力学性质是一种“寻根溯源”的方法,不仅可以解释宏观工程现象,还可以掌

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