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动力湿化作用下土体水分迁移规律试验研究

马德良, 韩弘驰, 董静, 李腾, 冯怀平, 杨志浩

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. DOI: 10.11779/CJGE20241053
引用本文: 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. DOI: 10.11779/CJGE20241053
Experimental Study on the Moisture Migration Law of Soils under Dynamic Slaking Conditions[J]. Chinese Journal of Geotechnical Engineering. DOI: 10.11779/CJGE20241053
Citation: Experimental Study on the Moisture Migration Law of Soils under Dynamic Slaking Conditions[J]. Chinese Journal of Geotechnical Engineering. DOI: 10.11779/CJGE20241053

动力湿化作用下土体水分迁移规律试验研究  English Version

基金项目: 国家自然科学基金(52308458,52302518,52272439);国家基金联合基金项目(U22A20233);中央引导地方项目(236Z5409G);河北省自然科学基金项目(E2023210054);

Experimental Study on the Moisture Migration Law of Soils under Dynamic Slaking Conditions

  • 摘要: 揭示动力湿化作用下路基土的水分迁移规律对于分析重载铁路翻浆冒泥病害成因至关重要。本文通过开发水力联合测试系统,开展了路基土的动力湿化三轴试验。研究发现,电阻率出现了先减小后增加,最后稳定的趋势,并提出了含水率计算方法,验证了水力联合测试系统在动力湿化试验的适用性;分析了动应力对水分迁移规律的影响。水分迁移速度随动应力增高而增加,含水率随动应力增高而降低。揭示了干密度对水分迁移规律的影响,随着动荷载和试样干密度的提高,试验前期含水率增速也提高。干密度和振动荷载的耦合作用对前期的水分分布影响较大,在较小的孔隙中产生了抽吸现象,加速了水分向上迁移。研究结果为揭示翻浆冒泥病害发病机理,保证既有线安全和完善设计理论提供依据。
    Abstract: Revealing the moisture migration law of subgrade soils under dynamic wetting conditions is crucial for analyzing the causes of mud pumping in heavy-haul railways. This study developed a hydraulic combined testing system to conduct triaxial tests on subgrade soils under dynamic wetting. The research found that resistivity initially decreases, then increases, and finally stabilizes, and proposed a method for calculating moisture content, verifying the applicability of the hydraulic combined testing system in dynamic wetting tests. The influence of dynamic stress on moisture migration was analyzed, showing that the moisture migration rate increases with higher dynamic stress, while moisture content decreases. The study also revealed the impact of dry density on moisture migration. With increased dynamic load and sample dry density, the initial moisture content increase rate also rises. The coupling effect of dry density and vibration load significantly affects early moisture distribution, creating a suction phenomenon in smaller pores that accelerates upward moisture migration.
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出版历程
  • 收稿日期:  2024-10-22
  • 网络出版日期:  2025-06-16

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