考虑含水率和干湿循环影响的原状黄土孔隙微观结构研究  

Pore microstructure of original loess considering water content and drying-wetting cycle effects

作　　者：袁志辉[1] 唐春[1] 杨普济[1] 刘晓 甘建军[1] 唐家备 YUAN Zhihui;TANG Chun;YANG Puji;LIU Xiao;GAN Jianjun;TANG Jiabei(School of Hydraulic and Ecological Engineering,Nanchang Institute of Technology,Nanchang 330099,China)

机构地区：[1]南昌工程学院水利与生态工程学院,江西南昌330099

出　　处：《南昌工程学院学报》2021年第4期48-55,共8页Journal of Nanchang Institute of Technology

基　　金：江西省教育厅科学技术研究项目(GJ1161119);江西省科技重点研发计划项目(20177BBG70046);国家科技支撑计划项目(2013BAJ06B04)。

摘　　要：为了明确不同含水率和干湿循环作用下原状黄土的微观结构特征,以陕西洛川黄土为研究对象,对不同含水率和干湿循环条件下的原状黄土的微观结构变化进行了研究。研究结果表明,含水率的增大和干湿循环作用均会使得原状黄土大孔隙的平均孔隙直径和孔隙数目增多、孔隙形态更趋于椭圆以及孔隙边缘形态更趋于简单、孔隙排列更趋于定向和有序。孔隙大小特征及数目的变化主要是水分溶解胶结物质,使得不同孔隙贯通和扩张所造成;孔隙形态和排列特征的变化主要是水分的运动以及胶结物质的迁移导致颗粒的移动和摩擦等作用形成。The loess in Luochuan City of Shaanxi Province was taken as the research object to study the microscopic structural characteristics of the original loess under different water content and drying-wetting cycle,and the condition of different water content and drying-wetting cycle was measured by scanning electron microscope.The microscopic structural changes of original loess were analyzed.The results show that the increase of water content and drying-wetting cycle will increase the average pore diameter and pore number of undisturbed loess macropores.The pore shape tends to be ellipse,the pore edge shape tends to be simple,and the pore arrangement tends to be directional and orderly.The change of pore size and number is mainly caused by the penetration and expansion of different pores caused by water dissolving cemented materials.The change of pore morphology and arrangement characteristics is mainly caused by the movement of water and the migration of cementing substance,which leads to the formation of particle movement and friction.

关 键 词：原状黄土 干湿循环 微观结构 孔隙形态 孔隙排列 

分 类 号：TU432[建筑科学—岩土工程]