河南科技大学学报（自然科学版）2025，Vol.46Issue(5)：51-60,10.DOI:10.15926/j.cnki.issn1672-6871.2025.05.007
干湿循环下改良洛阳膨胀土力学特性
Mechanical Properties of Improved Luoyang Expansive Soil under Dry-wet Cycle
摘要
Abstract
To investigate the improvement effect of cement on Luoyang expansive soil,and to reveal the strength degradation laws and crack evolution characteristics under wet-dry cycles,indoor experiments were conducted on Luoyang expansive soil with different cement ratios under dry-wet cycles.The grey relational degree and random forest methods were introduced to establish a macro-meso analysis model for expansive soil.The results indicate that the incorporation of cement alters the composition of Luoyang expansive soil and significantly reduces the free swelling rate.When the cement content reaches 6％(mass fraction),the expansive soil is transformed into non-expansive soil.With the increase in cement content,the compactness,unconfined compressive strength,and elastic modulus of the expansive soil first increase and then decrease,and the failure mode of the specimen transitions from plastic to brittle failure.As the number of dry-wet cycles increases,the strength and elastic modulus of the improved expansive soil exhibit a nonlinear decreasing trend and eventually stabilize.The optimal cement content is determined to be 6％.Analysis reveals that crack indicators are significantly correlated with compressive strength,with the mean crack width showing the strongest correlation.A random forest model was established for regression analysis,and the model demonstrated high accuracy and excellent performance in prediction.关键词
洛阳膨胀土/干湿循环/无侧限抗压试验/裂隙指标/随机森林模型Key words
Luoyang expansive soil/dry-wet cycle/unconfined compression test/fracture index/random forest model分类
建筑与水利引用本文复制引用
马建军,张玉刚,王超圣,程树凯,赵明冲..干湿循环下改良洛阳膨胀土力学特性[J].河南科技大学学报（自然科学版）,2025,46(5):51-60,10.基金项目
国家自然科学基金项目(11502072) （11502072）
河南省重点研发与推广专项—科技攻关项目(232103810082,222102320462) （232103810082,222102320462）
