初始干密度对脱湿红土含水吸力特性的影响  

Effect of Initial Dry Density on Water-bearing Features and Suction Properties of Dehumidified Laterite

作　　者：沈长云 黄英[1] 吴跃康 李奎 王志鹏 南海宇 金克盛[1] SHEN Changyun;HUANG Ying;WU Yuekang;LI Kui;WANG Zhipeng;NAN Haiyu;JIN Kesheng(Faculty of Electric Power Engineering,Kunming University of Science and Technology,Kunming 650504,Yunnan,China)

机构地区：[1]昆明理工大学电力工程学院,云南昆明650504

出　　处：《水力发电》2023年第6期110-114,121,共6页Water Power

基　　金：国家自然科学基金资助项目(51568031)。

摘　　要：以昆明非饱和红土为研究对象,以脱湿作用作为控制条件,考虑初始干密度的影响,通过滤纸法试验,研究初始干密度对昆明脱湿红土含水吸力特性的影响。结果表明,各脱湿含水率下,脱湿红土的质量含水率、滤纸含水率随初始干密度的增大分别呈缓慢减小、波动减小的变化趋势;各初始干密度下,土-水特征曲线呈现出基质吸力与体积含水率的变化趋势相反的特征;初始干密度一定时,脱湿红土的基质吸力总体上随着体积含水率的增加呈现缓慢减小~快速减小的变化趋势,突变体积含水率为26.5%;体积含水率一定时,随着初始干密度的增大,脱湿红土的基质吸力呈波动升高的变化趋势;基质吸力一定时,脱湿红土的体积含水率随初始干密度的增大亦呈波动升高的变化趋势。初始干密度不同,脱湿过程中红土颗粒的持水能力不同。Taking Kunming unsaturated laterite as the research object,the effect of initial dry density on water-bearing features and suction characteristics of Kunming dehumidification laterite is studied by filter paper method after taking dehumidification as the control condition.The results show that,(a)under each dehumidification moisture content,the mass moisture content and filter paper moisture content of dehumidified laterite decrease slowly and fluctuately with the increase of initial dry density,respectively;(b)under each initial dry density,the soil-water characteristic curve shows the opposite trend of matric suction and volumetric water content;(c)when the initial dry density is constant,the matric suction of the dehumidification laterite generally decreases slowly and then decreases rapidly with the increase of volumetric water content,and the sudden volumetric water content is 26.5%;(d)when the volumetric water content is constant,with the increase of the initial dry density,the matric suction of the dehumidification laterite shows a trend of fluctuating increase;and(e)when the matrix suction is constant,the volumetric water content of the dehumidification laterite also fluctuates with the increase of the initial dry density.When the initial dry density is different,the water-holding capacity of laterite particles is different during the dehumidification process.

关 键 词：脱湿红土 持水能力 土-水特征曲线 滤纸法 初始干密度 基质吸力 

分 类 号：TU411[建筑科学—岩土工程]