高原湖相泥炭土渗透特性试验研究

发布时间：2018-04-08 15:34

本文选题：泥炭土　切入点：有机质　出处：《昆明理工大学》2017年硕士论文

【摘要】：泥炭土(包括泥炭和泥炭质土)是一种由有机质团聚体、无机矿物以及植物残根等组成的特殊土,其物理力学性质与一般的软土和有机质土有较大差异。本文以昆明及大理地区泥炭土为对象,研究了云南高原湖相泥炭土的渗透特性,并结合泥炭土固结过程中的孔隙分布特征对其渗透特性进行了机理分析。具体研究内容有:(1)对高原湖相泥炭土进行一维固结渗透联合试验,研究其在侧限条件下的压缩与渗透性状。通过长期及分级加载试验,研究了加载时长T、固结应力σ与渗透系数kv之间的相关关系,并对泥炭土 e-kv归一化模型进行了探索。(2)通过三轴固结渗透试验,对等向固结条件下泥炭土渗透特性进行了研究,探索等向固结下渗透系数kv与固结围压σ及孔隙比e之间的关系,对比分析了三轴等向固结与一维侧限固结条件下泥炭土渗透系数变化规律的异同。(3)通过电镜扫描试验,分析了纤维泥炭土与高分解泥炭土中孔隙特征的不同,从微观角度定性分析了高原湖相泥炭土的渗透特性机理。通过压汞试验对一维固结过程中高原湖相泥炭土的孔隙分布特征进行了研究,分析了一维固结分级加载时,泥炭土内部孔隙的分布变化规律。建立泥炭土微结构模型图,从压缩过程中泥炭土孔隙分布变化情况出发,定量分析了泥炭土渗透特性变化的微观机理。
[Abstract]:In this paper, the percolation characteristics of lake-facies peat soils in Kunming and Dali areas are studied, and the mechanism of percolation characteristics is analyzed based on the pore distribution during the consolidation process of peat soils.The main contents of this study are as follows: (1) A one-dimensional consolidation and osmotic test was carried out to study the compression and permeability properties of the peat soils in the lake facies of the plateau under the lateral limit.The correlation between long T, consolidation stress 蟽 and permeability coefficient KV was studied by long-term and stepwise loading tests, and the e-kv normalized model of peat soil was explored.The permeation mechanism of plateau lacustrine peat is analyzed qualitatively from the microscopic point of view.The pore distribution characteristics of plateau lacustrine peat during one dimensional consolidation were studied by mercury injection test, and the distribution and variation of porosity in peat soil under one-dimensional consolidation and grading loading were analyzed.The microstructure model diagram of peat soil was established and the microscopic mechanism of the change of permeability characteristics of peat soil was quantitatively analyzed from the change of pore distribution in the course of compression.
【学位授予单位】：昆明理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU41

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