工程地质学报2017，Vol.25Issue(5)：1299-1306,8.DOI:10.13544/j.cnki.jeg.2017.05.016
饱和细粒土固结过程中矿物组分与有机质的三维表征
THREE-DIMENSIONAL CHARACTERIZATION OF MINERAL AND ORGANIC COMPOSITIONS IN PROCESS OF CONSOLIDATION OF SATURATED FINE-GRAINED SOIL
摘要
Abstract
The particles in the saturated fine-grained soils are small.Their specific surface areas are large.The pore water and organics in the soil tends to form aggregates.This combination has important influence on the physical and mechanical properties of the soil.In this paper,the effect of multi-material structure of saturated fine-grained soil on its consolidation and evolutionary properties is discussed from the perspective of three-dimensional microstructure.The components in the soil samples are classified into four groups:pores,organics,multi-minerals and illite-dominated minerals.The structures were analyzed by synchrotron radiation μCT combined with the data constrained modelling in the consolidation process.The results show that illite-dominated minerals are hydrophilic and displaya coexistence of multiple phases in a voxel with pore,so that the water is difficult to be discharged under high pressure(1600kPa).Organics combined with illite minerals form organoclay agglomerated particles.It is not only adsorbed on the illite-dominated mineral surface,but also embedded in the mineral structure.The organics migrated in consolidation progress,which is illustrated by gradually increased volume of organics(in 40 ~400μm diameter).The strength of the soil between the soil particles weakened.This research utilizes qualitative and quantitative analysis to obtain evolutionary characteristics of minerals and organics.The approach presented would be applicable in studying the relationship between microstructure and macro-properties for special engineering soils.关键词
矿物组分/有机质/同步辐射μCT/数据约束模型Key words
Minerals compositions/Organics/Synchrotron radiation μCT/Data constrained modelling分类
天文与地球科学引用本文复制引用
刘治清,宋晶,李学,杨玉双,任玉琦..饱和细粒土固结过程中矿物组分与有机质的三维表征[J].工程地质学报,2017,25(5):1299-1306,8.基金项目
国家自然科学基金(41402239,41572277,61505266),广东省自然科学基金(S201204000733)资助. （41402239,41572277,61505266）
