有机质在吹填淤泥固结中的微宏观特征

发布时间：2018-04-18 05:32

  本文选题：吹填淤泥 + 有机质　； 参考：《中国海洋大学学报(自然科学版)》2017年10期

【摘要】：有机质是吹填淤泥的重要组成部分,吹淤造陆工程中,有机质对土体团聚体的形成和稳定所起的作用亟待研究。本研究通过室内模拟实验,获取物理力学指标,定量分析有机质对吹填淤泥工程地质性质的宏观影响;同时,进行多能量同步辐射显微CT实验,采用数据约束模型,分析孔隙、有机质、矿物质1组和矿物质2组四个组分,定量分析有机质在固结过程中的结构赋存及组分相关性特征。研究表明,有机质含量与物理稠度指标(液限、塑限和塑性指数)正相关、与抗剪强度指标负相关;有机质与原生矿物相互独立赋存、与黏土矿物较为密切共存。吹填淤泥固结过程中,孔隙通道和原生矿物组成土体骨架结构,有机质依附于黏土矿物表面,黏土矿物依附于原生矿物表面,形成逐渐稳定的团絮状结构。本研究定量分析了有机质微宏观特征,一定程度上突破了常规方法视场和分辨率的矛盾,实现纳米分辨的各成分三维结构。
[Abstract]:Organic matter is an important part of dredging silt. The role of organic matter in the formation and stability of soil aggregates is urgent to be studied.In this study, the physical and mechanical indexes were obtained by indoor simulation experiments, and the macroscopic effects of organic matter on the engineering geological properties of dredged silt were quantitatively analyzed. At the same time, the multi-energy synchrotron radiation microCT experiment was carried out, and the pore was analyzed by data constraint model.Organic matter, mineral group 1 and mineral group 2 were quantitatively analyzed by quantitative analysis of the structural occurrence and component correlation characteristics of organic matter during the consolidation process.The results show that the content of organic matter is positively correlated with the physical consistency index (liquid limit, plastic limit and plasticity index) and negatively correlated with the shear strength index, and the organic matter and the primary mineral exist independently and coexist closely with clay minerals.In the process of consolidation, pore channels and primary minerals form the skeleton structure of soil, organic matter is attached to the surface of clay minerals and clay minerals are attached to the surface of primary minerals, forming a gradually stable flocculating structure.In this study, the micro-macro characteristics of organic matter were quantitatively analyzed, which broke through the contradiction between the field of view and the resolution of conventional methods to a certain extent, and realized the three-dimensional structure of each component of nano-resolution.
【作者单位】： 中山大学地球科学与工程学院;澳大利亚联邦科学与工业研究组织;
【基金】：国家自然科学基金项目(41402239,4157227,61505266) 广东省自然科学基金项目(S201204000733) 国家留学基金项目(201506385046)资助~~
【分类号】：P642;P756.8
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本文编号：1767030