岩土工程学报2026，Vol.48Issue(6)：1332-1337,6.DOI:10.11779/CJGE20241234
无荷和有荷条件下膨胀土的膨胀屈服特性
Swelling yield characteristics of expansive soils under unloaded and loaded conditions
摘要
Abstract
To investigate the yield characteristics of expansive soils under unloaded and loaded swelling conditions,a series of unloaded and loaded swelling rate tests are conducted on intact weakly expansive soils with different initial suctions under measuring suction conditions using a consolidation apparatus for unsaturated soils.The study systematically examines the variation patterns of void ratio and suction during the swelling deformation process and explores the swelling yield characteristics of expansive soils.The results show that:under loaded swelling conditions,the void ratio decreases as suction decreases,which contrasts with the unloaded condition where the void ratio decreases as suction increases.Under one-dimensional compression conditions,a higher initial suction leads to a faster reduction rate in the void ratio of expansive soil.After compression stabilization under a net vertical stress,the void ratio decreases as the suction increases.As the net vertical stress increases,the LC yield curve shifts approximately parallel to the right,while both the one-dimensional compression yield suction and the loaded swelling yield suction decrease.The SD and SI yield curves remain nearly parallel and form an obtuse angle with the s-axis.With an increase in initial suction,the plastic region of void ratio enclosed by the LC and SD yield curves and the s-and p-axes expands,whereas the elastic domain bounded by the LC,SI,and SD yield curves and the s-axis contracts.关键词
膨胀土/屈服特性/膨胀变形/吸力/膨胀率Key words
expansive soil/yield characteristic/swelling deformation/suction/swelling ratio分类
建筑与水利引用本文复制引用
方瑾瑾,冯以鑫..无荷和有荷条件下膨胀土的膨胀屈服特性[J].岩土工程学报,2026,48(6):1332-1337,6.基金项目
河南省高校基本科研业务费专项资金项目(NSFRF230408) （NSFRF230408）
安全与能源工程学部"双一流"创建工程培育项目(AQ20250720) （AQ20250720）
河南省科技攻关项目(262102321105)This work was supported by the Fundamental Research Funds for the Henan Provincial Universities(Grant No.NSFRF230408),the"Double First-Class"Initiative Creation Project of the Faculty of Safety and Energy Engineering(Grant No.AQ20250720),and the Technology Research Project of Henan Province(Grant No262102321105). （262102321105）
