长春工程学院学报（自然科学版）2025，Vol.26Issue(2)：7-14,8.DOI:10.3969/j.issn.1009-8984.2025.02.002
冻融循环对粉煤灰改良土剪切特性影响规律试验研究
Experimental Study on the Influence Law of Freeze-Thaw Cycles on Shear Characteristics of Fly Ash Improved Soil
摘要
Abstract
To investigate the shear performance of silty clay improved by fly ash under freeze-thaw cycles,soils around the foundation of power transformation towers in Liaoyuan area are selected as experimental materials,and shear tests are conducted on the sample interface under different fly ashes contents,normal stress conditions,and freeze-thaw cycles.A constitutive model of stress-strain relationship is established,and the influence law of various factor on interface strength parameters is analyzed.The test results are in-dicated that the shear stress and displacement curves exhibit nonlinear variations.The range of variation can be divided into three stages,initial linear elastic deformation,plastic deformation,and residual stability.With the increase of freeze-thaw cycles,the cohesion and internal friction angle of the improved silty clay show a decreasing trend.The strength characteristics of the improved soil are influenced by fly ash con-tent,showing a regular trend of increasing first and then decreasing.When the fly ash content is 10%,the mechanical indicators of the sample reach the maximum value.If the fly ash content continues to increase,the shear strength decreases instead.The incorporation of appropriate fly ash content into improved silty clay can significantly improve the structural and connectivity between soil particles.The research results can provide practical reference for the foundation design of construction projects in seasonal frozen soil are-as.关键词
季节性冻土/冻融循环/土壤改良/抗剪强度/粉煤灰Key words
seasonal frozen soil/freeze-thaw cycle/soil improvement/shear strength/fly ash分类
建筑与水利引用本文复制引用
梁冲,张以晨,丁嘉顺,刘华南..冻融循环对粉煤灰改良土剪切特性影响规律试验研究[J].长春工程学院学报（自然科学版）,2025,26(2):7-14,8.基金项目
国网吉林省电力有限公司科技项目(2022JBGS-07)吉林省科技发展计划项目(20230203130SF) （2022JBGS-07）
