陕西蒲城黄土微观结构特征及定量分析  

QUANTITATIVE ANALYSIS OF MICROSTRUCTURE CHARACTERISTICS OF PUCHENG LOESS IN SHAANXI PROVINCE

作　　者：方祥位[1] 申春妮[2] 李春海[1] 汪龙[1] 陈正汉[1] 

机构地区：[1]后勤工程学院岩土力学与地质环境保护重庆市重点实验室,重庆401311 [2]重庆科技学院建筑工程学院,重庆401331

出　　处：《岩石力学与工程学报》2013年第9期1917-1925,共9页Chinese Journal of Rock Mechanics and Engineering

基　　金：国家自然科学基金资助项目(11272354);后勤工程学院学术创新项目(YZ11–42201);国家科技支撑计划项目(2012BAK05B00)

摘　　要：利用Quanta环境扫描电镜对陕西蒲城电厂各土层黄土特别是Q2黄土试样进行微观结构测试,得到大量微观结构图片。针对黄土的微观结构特征,提出骨架颗粒的连接可分为直接点接触、直接面接触、间接点接触及间接面接触4种形式。微观结构定量分析表明,随着深度的增加,各土层黄土的灰度熵、颗粒和孔隙的数量、圆形度等没有明显的变化规律;颗粒的面积比例、定向度、分布分维逐渐增大;而欧拉数、孔隙的面积比例、定向度、分布分维逐渐减小。研究表明,Q3和Q2黄土微观结构特征与其湿陷性具有较好的相关性。The microstructure characteristics of loess, especially Q2 loess, at Pucheng power plant in Shaanxi Province were investigated using Quanta environment scanning electron microscope（ESEM）. Consequently, various microstructure pictures were obtained. The four forms of particle connections, i.e. direct point contact, direct face contact, indirect point contact and indirect face contact, are suggested. The microstructure quantitative analysis results of loess show the area proportion, the orientation and the distribution fractal dimensions of particles increase with depth. Whilst the area proportion, the orientation and the distribution fractal dimension of pore, and the Euler value decrease with depth. However, the number and the roundness of particle, the number of pore, and the gray entropy have not significant change law with depth. The microstructure characteristics and the collapsibility of Q3 and Q2 loesses have a good relationship.

关 键 词：土力学 黄土 微观结构 定量分析 湿陷性 

分 类 号：TU444[建筑科学—岩土工程]