有机质在吹填淤泥固结中的微宏观特征

Micro-Macro Characteristics of Organic Matters in Dredger Fill Consolidation

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。

Organic matters are important parts of dredged fill.It is necessary to research the influences on the formation and stability of soil aggregates in the land reclamation project.The authors quantitatively analyzed the macro effect of organic matters on the engineering geological properties through laboratory simulation experiment to obtain the physical and mechanical indexes.At the same time,the study is also dedicated to the quantitative analysis of the relationship between the structure and characteristics of occurrence of organic matters in the process of consolidation through multi energy synchrotron radiation X-rayμCT experiment and analysis of the pore,organic matters,minerals group 1 and minerals group 2 with the data model.The results show that organic matters content is positively correlated to physical consistency index（liquid limit,plastic limit and plasticity index）and negatively correlated to shear strength index.Organic matters mutually independent with minerals,but closely coexistent with clay minerals.Moreover,pores and primary minerals present soil structure in the consolidation process of dredged fill.Organic matters attached to clay minerals while clay minerals attached to the original mineral surface.Quantitative analysis of the characteristics has been studied.Organic matters research with micro-macro will break through the conventional method.It achieve nanometer characterization of 3 Dstructure.