摘 要：吹填土的工程地质性质受土体的物质组成和微观结构综合影响，由于取样、制样难等因素，微观结构在以往的研究中涉及较少。以天津滨海新区吹填土为研究对象，用X射线衍射分析方法确定吹填土中的矿物成分，并结合扫描电子显微镜微观结构照片，利用WD-5 图像处理系统对土体的微观结构作定量分析，讨论两种不同加固处理方法下天津滨海新区吹填土结构单元体、孔隙的丰度和定向频率等评价指标的变化情况。试验分析表明，经过排水处理后，孔隙率变小，土中结构单元体从较为松散的状态转变为团聚状态，孔隙也随之进行调整，孔隙数量减少，定向性逐渐不明显，土体固结程度变高。
Abstract: Geological characters of dredger fill have been studied in recent years and the engineering geological properties of dredger fill is comprehensively affected by the material composition and microstructure. Because there’re many difficult factors such as sampling and sample preparation, microstructure is indispensable but seldom involved in the former research. Taking the dredger fill in Tianjin Binhai New Area as study object, the mineral composition is identified by X-ray diffraction approach, and the microstructure is studied by scanning electronic microscope (SEM), along with quantificational analysis of the microstructure using WD-5 picture processing system. And then the changing of evaluation indicators in two different reinforcement approaches, such as the size of structure element and pore, abundance, and directional frequency are discussed. The conclusion indicates that after water drainage treatment, the porosity becomes smaller, the dispersed structural elements of soil become agglomerated elements, displaying a variety of oblate. Simultaneously, the pores in the soil are diminished and lose balance, and directing property becomes indistinct. Consolidation degree of soil becomes higher.