吉首大学学报（自然科学版）2026，Vol.47Issue(4)：43-50,8.DOI:10.13438/j.cnki.jdzk.2026.04.007
基于微观结构变化的水泥改良花岗岩残积土的击实特性
Compaction Characteristics of Cement-Amended Granitic Residual Soil Based on Micro-Structural Evolution
摘要
Abstract
To investigate the effects of cement content on the compaction characteristics and microstruc-tural evolution of granite residual soil,this study used granite residual soil from Yiyang,Hunan Prov-ince,and conducted compaction tests,scanning electron microscopy(SEM)image analysis,and energy dispersive spectrometer(EDS)spectroscopy with cement contents of 0%,3%,5%,7%,and 9%.The ex-periments revealed that the modifying effect of cement does not continue to increase as the cement con-tent rises.Microscopic tests further revealed the underlying mechanisms within the soil.SEM observa-tions showed that as the hydration reaction progressed,the microscopic porosity decreased significantly from 14.16%in its natural state to 6.00%;EDS spectroscopy results showed that the mass fraction of Ca in the soil increased significantly from 0%to 10.02%,indicating enhanced cement hydration.The for-mation of hydration products promoted pore filling and led to a redistribution of the elemental composi-tion in the specimens.In engineering practice,it is recommended that the admixture dosage for conven-tional subgrade projects be controlled at around 5%;if higher compaction requirements are needed for specific sections,a dosage of 7%may be selected,but this must be accompanied by strict crack-prevention and curing measures.关键词
花岗岩残积土/水泥改良土/击实特性/三阶段模型Key words
granite residual soil/cement-improved soil/compaction characteristics/three-stage model分类
建筑与水利引用本文复制引用
薛文卓,刘新宇,邓宗伟..基于微观结构变化的水泥改良花岗岩残积土的击实特性[J].吉首大学学报（自然科学版）,2026,47(4):43-50,8.基金项目
湖南省自然科学基金联合项目(2025JJ70388) （2025JJ70388）
