路基工程Issue(4)：1-6,6.DOI:10.13379/j.issn.1003-8825.202501020
膨胀土用作路基填料的工程特性及改良方案研究
On Engineering Characteristics and Improvement Schemes of Expansive Soil as A Subgrade Filling Material
摘要
Abstract
To improve expansive soil for use in subgrade embankment,a study on its expansion characteristics and improvement measures was conducted based on laboratory tests.The results show that the soil in the test area is characterized by high liquid limit and high plasticity index,and is classified as moderately expansive soil when used as subgrade fill material.The permeability coefficient exhibits a three-stage variation with increasing numbers of tests,which is the main factor influencing the expansion ratio of soil samples at different locations.The swelling pressure shows a positive correlation with time and eventually tends to stabilize;the expansion ratio is negatively correlated with applied load,gradually approaching zero.When the applied load exceeds the stabilized swelling pressure,the soil enters a collapsible state.The test curves of expansion characteristics are fitted to exponential function equations with a consistent structure,allowing the allowable swelling pressure to be determined based on the allowable deformation value of the soil.After comparing four improved utilization schemes,the optimal solution was found to be the addition of 3%cement with a compaction degree of 94%.关键词
路基工程/膨胀土/改良利用/试验比选/渗透性/膨胀特性/处治建议/经济性Key words
subgrade engineering/expansive soil/improved utilization/experimental comparison and selection/permeability/expansion characteristics/treatment recommendations/economic feasibility分类
交通工程引用本文复制引用
沈朝政,代志俊,苗学云,程佳..膨胀土用作路基填料的工程特性及改良方案研究[J].路基工程,2026,(4):1-6,6.基金项目
中国铁路青藏集团有限公司科技研究开发计划项目(QZ2023G01) （QZ2023G01）
中铁西北科学研究院有限公司自主创新项目(2022XBK03、2023XBK03) （2022XBK03、2023XBK03）
中国中铁股份有限公司科技研究开发计划(科研院2023-重大-01) （科研院2023-重大-01）
