水力发电学报2025，Vol.44Issue(4)：1-11,11.DOI:10.11660/slfdxb.20250401
低黏粒含量黄土填料的分散性判别及其分散机理分析
Dispersibility evaluation and dispersive mechanism analysis of low-clay-content loess
摘要
Abstract
Clay content is a key factor in evaluating soil dispersibility,but few previous studies are found in literature of the dispersive mechanism of low clay content loess.This study evaluates the dispersibility of such soil-collected from Guyuan,Ningxia-using five commonly used methods and a comprehensive evaluation method.We examine the factors of soil dispersibility and its mechanism through mineral composition,microscopic morphology,and chemical analysis.The results indicate that the comprehensive evaluation of different methods reveal this low-clay-content loess as a dispersive soil.The exchangeable sodium percentage of this soil is quite low,implying its dispersion mainly results from the physical factors instead of chemical factors.The bonding effect of aggregates cemented by clay particles and the aggregate structures agglomerated by aggregates are both weak due to low clay contents.Therefore,we develop a physical dispersive mechanism for low clay content loess:under the action of water,non-water-stable aggregates formed by the cementation of clay particles quickly disintegrate,leading to an increase in soil pores or certain changes in pore structure,i.e.,erosion and similar phenomena.关键词
水利工程/低黏粒黄土/分散性/颗粒团聚/物理分散Key words
hydraulic engineering/low-clay-content loess/dispersibility/particle aggregation/physical dispersion分类
土木建筑引用本文复制引用
张刚,刘鑫泽,马文国,ISRAR Jahanzaib..低黏粒含量黄土填料的分散性判别及其分散机理分析[J].水力发电学报,2025,44(4):1-11,11.基金项目
国家自然科学基金项目(52369020) （52369020）
宁夏自然科学基金项目(2023AAC02024) （2023AAC02024）
宁夏高等学校一流学科建设(水利工程)资助项目(NXYLXK2021A03) （水利工程）
