酸污染红土的浸泡特性研究

发布时间：2018-04-28 03:38

本文选题：浸泡条件 + 酸污染红土　；参考：《昆明理工大学》2014年硕士论文

【摘要】：本文结合云南基础设施建设中广泛使用的红土及酸污染红土的存在问题,提出了“酸污染红土的浸泡特性研究”这一课题。围绕这一课题,主要开展了浸泡条件下,酸液泡入红士及酸液泡出红土两种不同方式的酸污染形式,研究了酸污染红土的强度变形特性、微结构变化特性、物质组成变化特性及宏微观响应关系四个方面的研究工作,为揭示酸污染红土问题奠定了基础。酸污染红土的强度变形试验结果表明：酸液泡入红土及酸液泡出红土,随着酸液浓度的增大、浸泡时间的延长及环境温度的增大,红土的抗剪强度最终逐渐减小,压缩性逐渐增大。微结构试验结果表明：酸液泡入红土及酸液泡出红土,随着酸液浓度的增大、浸泡时间的延长及环境温度的增大,红土的微结构特征呈现不同的趋势,土颗粒逐渐变小,孔隙逐渐增大，土颗粒形状越来越不规则,土颗粒表面越粗糙。酸污染红土的物质组成特性试验结果表明：酸液泡入红土及酸液泡出红土,红土中的氧化铁和氧化铝含量逐渐减小,浸泡溶液中的铁离子和铝离子浓度逐渐增大。浸泡条件下酸污染红土的强度特性可以从吸水作用、侵蚀作用、凝聚作用及溶解作用来解释,这四个作用来共同影响了酸污染红土的浸泡特性。
[Abstract]:Based on the existing problems of red soil and acid-contaminated laterite which are widely used in infrastructure construction in Yunnan Province, this paper puts forward the subject of "study on soaking characteristics of acid-polluted laterite". Focusing on this subject, two different forms of acid pollution were carried out under the condition of soaking, the acid solution was soaked in the red soil and the acid solution bubble out of the red soil, and the strength and deformation characteristics and microstructure change characteristics of the acid contaminated red soil were studied. The research work on material composition change characteristics and macro and micro response relationship lays a foundation for revealing the problem of acid contaminated laterite. The results of strength deformation test of acid-contaminated laterite show that the shear strength of laterite decreases gradually with the increase of acid concentration, the prolongation of soaking time and the increase of ambient temperature. The compressibility increases gradually. The results of microstructure test showed that the microstructural characteristics of red soil showed different trends with the increase of acid concentration, soaking time and environment temperature, and the particle size of the red soil gradually decreased with the increase of acid concentration, soaking time and environment temperature. The porosity increases gradually, the shape of soil particle becomes more and more irregular, and the surface of soil particle becomes rougher. The results show that the content of iron oxide and alumina in red soil decreases gradually, and the concentration of iron ion and aluminum ion in soaking solution increases gradually. The strength characteristics of acid-contaminated laterite under soaking conditions can be explained by water absorption, erosion, agglomeration and dissolution, which affect the soaking characteristics of acid-contaminated laterite.
【学位授予单位】：昆明理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：X53;TU43

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