岩土工程学报2026，Vol.48Issue(2)：280-290,11.DOI:10.11779/CJGE20241053
动力湿化作用下土体水分迁移规律试验研究
Experimental study on moisture migration law of soils under dynamic slaking conditions
摘要
Abstract
Understanding the moisture migration mechanisms in railway subgrade soils under dynamic slaking(D-S)is critical for elucidating the formation mechanisms of frost heave and mud pumping defects in heavy-haul railways.This study employs an autonomously developed hydromechanical coupled testing system to conduct dynamic slaking triaxial tests on subgrade soils.By analyzing resistivity characteristics,we investigate the moisture migration processes and reveal the underlying mechanisms of dynamic effects on moisture transport.A normalized resistivity-based water content calculation method is established to analyze the coupled interaction mechanisms of dynamic stress and dry density on moisture migration.Key findings include as follows:(1)Soil sample resistivity exhibits a three-stage evolution pattern("decreasing-increasing-stabilizing")under dynamic slaking,validating the applicability of the hydromechanical coupling testing system for dynamic slaking experiments;(2)With increasing dynamic stress,moisture migration velocity decreases by approximately 11%,while equilibrium water content reduces by about 0.8%;(3)Higher dry density accelerates initial water content growth,with capillary suction phenomena observed in high-density samples,promoting upward moisture migration from the bottom.These findings provide experimental evidence for improving dynamic slaking moisture migration models and advancing the understanding of frost heave and mud pumping pathogenesis in railway subgrades.关键词
动力湿化/水分迁移规律/水-力联合测试/路基土Key words
dynamic slaking/moisture migration/hydro-mechanical joint apparatus/subgrade soil分类
建筑与水利引用本文复制引用
马德良,韩弘驰,董静,李腾,冯怀平,杨志浩..动力湿化作用下土体水分迁移规律试验研究[J].岩土工程学报,2026,48(2):280-290,11.基金项目
国家自然科学基金项目(52308458,52302518) （52308458,52302518）
国家自然基金联合基金项目(U22A20233) （U22A20233）
中央引导地方项目(236Z5409G) （236Z5409G）
河北省自然科学基金项目(E2023210054)This work was supported by National Natural Science Foundation of China(Grant Nos.52308458,52302518,U22A20233),Central Guidance Local Project(Grant No.236Z5409G),and Natural Science Foundation of Hebei Province Project(Grant No.E2023210054). （E2023210054）
