重金属污染土物化特性和固化机理试验研究

发布时间：2018-01-12 00:17

本文关键词：重金属污染土物化特性和固化机理试验研究　出处：《中原工学院》2017年硕士论文　论文类型：学位论文

【摘要】：针对重金属污染土孔隙比高、压缩性大,抗剪强度低、承载力差等原因导致的地基强度低、变形大和不均匀沉降等问题,本文选取重金属(Pb~(2+)、Zn~(2+)、Cu~(2+))污染土为研究对象,首先对现场未污染土的化学成分和微观结构进行分析;然后运用室内试验、各种测试技术和相关数学方法,深入研究重金属污染土的固化机理,全面分析重金属污染土的各种物化特性、矿物成分、微观结构、重金属离子浓度、固化剂及其掺量和龄期等因素对重金属污染土固化效果的影响和相关性;进而研究“土-固化剂-重金属离子”相互作用的重金属污染土的固化机理,给出固化剂及其掺量(配比)、重金属离子(浓度和组成成分)、土体强度、淋滤性和渗透性等因素对固化过程的影响规律及其关系式,为重金属污染土壤的工程开发建设提供了一定的理论和技术支持。主要研究内容如下:(1)重金属(Pb~(2+)、Zn~(2+)、Cu~(2+))污染土的物化特性研究首先以现场取样土体为研究对象,研究重金属污染土污染前后的物化特性、重金属离子的作用影响及其各影响因素的相关性。然后以试验室制样为研究对象,研究重金属污染土和未污染土的物化特性、重金属离子的作用影响及其各影响因素的相关性。最后将现场取样和试验室制样两种情况下的研究成果进行比较研究,探讨室内试验的合理性,分析二者研究成果的相关性。(2)重金属(Pb~(2+)、Zn~(2+)、Cu~(2+))污染土固化机理研究以试验室制样为研究对象,考虑“土-固化剂-重金属离子”相互作用的影响,通过研究固化过程中重金属污染土的微观结构变化规律。探讨重金属污染土的固化机理。(3)重金属(Pb~(2+)、Zn~(2+)、Cu~(2+))污染土固化技术研究采用室内试验,研究合理的重金属(Pb~(2+)、Zn~(2+)、Cu~(2+))污染土固化处理新方法,探讨处理不同污染程度的重金属污染土时固化剂与添加剂及其掺量(配合比)的选用方案和适用条件。
[Abstract]:Heavy metal pollution in soil pore ratio, high compressibility, low shear strength, the strength of the foundation bearing capacity and other reasons lead to poor low, large and uneven settlement of problems such as deformation, this paper selected heavy metals (Pb~ (2+), Zn~ (2+), Cu~ (2+)) contaminated soil as the research object, the first analysis the first chemical composition on site uncontaminated soil and micro structure; and then use the indoor test, various testing techniques and related mathematical methods, in-depth study of curing mechanism of heavy metal pollution in soil, a comprehensive analysis of various physical and chemical properties, heavy metal pollution of soil mineral composition, microstructure, concentration of heavy metal ions, factors of curing agent and its dosage and age the influence of heavy metal pollution in soil during the curing effect and correlation; curing mechanism of soil curing agent of heavy metal ions "soil heavy metal pollution interaction, curing agent and its dosage given (ratio), the concentration of heavy metal ions ( And composition), the strength of soil, leaching and permeability and other factors influence on the curing process and its relation, provides a theoretical and technical support for the development and construction of heavy metal pollution in soil engineering. The main contents are as follows: (1) heavy metal (Pb~ (2+), Zn~ (2+), Cu~ (2+)) study on physicochemical characteristics of contaminated soil at first sampling soil as the research object, the physicochemical characteristics before and after the study of heavy metal pollution in soil pollution, and the correlation of each influencing factor of heavy metal ions. Then by test sample preparation as the research object, the study of heavy metal pollution in soil and uncontaminated soil physicochemical properties, and the correlation of each influencing factor of heavy metal ions. Finally compare research results of field sampling and laboratory sample preparation under two kinds of situations, reasonable of indoor test, the analysis results of the two The correlation of heavy metals. (2) (Pb~ (2+), Zn~ (2+), Cu~ (2+)) on the mechanism of soil pollution curing by test sample preparation as the research object, considering the influence of the soil curing agent of heavy metal ion interaction, through the micro structure changes of soil heavy metal pollution in the curing process to investigate the curing mechanism of heavy metal pollution. Soil heavy metals. (3) (Pb~ (2+), Zn~ (2+), Cu~ (2+)) on the curing technology of contaminated soil by laboratory experiments to study the reasonable heavy metal (Pb~ (2+), Zn~ (2+), Cu~ (2+)) contaminated soil curing processing new methods of treatment of soil heavy metal pollution in different degree of pollution when curing agent and additive and admixture (mix) selection scheme and application conditions.

【学位授予单位】：中原工学院
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：X53

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