硅酸盐通报2025，Vol.44Issue(5)：1927-1938,12.DOI:10.16552/j.cnki.issn1001-1625.2024.1146
水泥固化高填方黄土抗压强度特性及其影响因素
Compressive Strength Characteristics and Its Influencing Factors of High Fill Loess Solidified by Cement
摘要
Abstract
Evaluating the reinforcement effect of loess foundation involves determining the compressive strength characteristics of cement-solidified loess,which serves as the basis for analysis.Using high fill loess in Yan'an New Area as the subject,the unconfined compressive strength tests and direct shear tests were conducted under various conditions to analyze the effects of cement content,curing age,compaction degree,moisture level,and immersion environment on unconfined compressive strength.The correlation between compressive strength,and shear strength,deformation modulus of cement-solidified loess was investigated.The findings indicate the occurrence of oblique cracks at 30°～40° angles in cement-solidified loess following compression failure,demonstrating brittle failure characteristics.The stress-strain curve of cement-solidified loess exhibits a strain-softening behavior,encompassing elastic stage,plastic yield stage,stress decay stage,and residual stability stage.The unconfined compressive strength of cement-solidified loess demonstrates a linear increase with higher cement content,longer curing age,and greater compaction degree.However,the rate of increase gradually diminishes as these factors escalate.Additionally,the unconfined compressive strength decreases exponentially with initial water content.The unconfined compressive strength of cement-solidified loess decreases under water immersion condition,and the unconfined compressive strength of the samples after water immersion is more than 26％ lower than that before water immersion.Furthermore,there is a linear correlation between the unconfined compressive strength of cement-solidified loess and shear strength as well as deformation modulus.The cohesion represents approximately 20％～30％ of unconfined compressive strength,and the deformation modulus is 23～250 times of unconfined compressive strength.关键词
高填方黄土/水泥固化黄土/无侧限抗压强度/破坏模式/影响因素Key words
high fill loess/cement-solidified loess/unconfined compressive strength/destruction mode/influencing factor分类
土木建筑引用本文复制引用
邱明明,杨萌,李晓敏,李盛斌..水泥固化高填方黄土抗压强度特性及其影响因素[J].硅酸盐通报,2025,44(5):1927-1938,12.基金项目
陕西省自然科学重点研发计划项目(2020ZDLSF06-03) （2020ZDLSF06-03）
陕西省教育厅服务地方专项计划项目(21JC035) （21JC035）
延安市重点研发计划项目(2019ZCSY-006) （2019ZCSY-006）
延安大学科研计划资助项目(2023KXJ-010,2021ZCQ011) （2023KXJ-010,2021ZCQ011）
