冻融循环下砂土物理特性变化分析  

Analysis of Physical Property Changes in Sandy Soil under Freeze-Thaw Cycles

作　　者：王宇亮 陈末 Wang Yuliang;Chen Mo(Heilongjiang University,School of Hydraulic and Electric Power,Harbin 150000,Heilongjiang;Institute of Cold Groundwater Research,Heilongjiang University,Harbin 150000,Heilongjiang)

机构地区：[1]黑龙江大学水利电力学院,黑龙江哈尔滨150000 [2]黑龙江大学寒区地下水研究所,黑龙江哈尔滨150000

出　　处：《陕西水利》2025年第4期19-21,25,共4页Shaanxi Water Resources

摘　　要：我国东北地区地形受冻融侵蚀严重。土壤中的水因冻融而结冰,改变了土壤的体积,使其膨胀或收缩,破坏了土壤的结构,改变了土壤的性质,进而导致水土流失的改变和增加。由于对冻融侵蚀的研究较少,目前很难预测和评估中国的水土流失情况。分析在冻融作用下,室内单向封闭冻融循环实验如何改变砂土的物理特性,并研究这一过程对土壤可侵蚀性的力学影响。结果表明:冻融作用会降低土壤容重和增加孔隙度,进而影响土壤侵蚀;土壤的渗透性会随着冻融循环次数的增加而增加,其变化趋势与孔隙度的变化趋势非常相似;冻融温差和土壤样本初始含水量的增加会导致土壤容重下降、孔隙度和渗透性增加。The terrain in Northeast China is seriously eroded by freeze-thaw.The water in the soil freezes due to freezing and thawing,which changes the volume of the soil,causes it to expand or shrink,destroys the structure of the soil,changes the properties of the soil,and then leads to the change and increase of soil erosion.Due to the lack of research on freeze-thaw erosion,it is difficult to predict and evaluate soil erosion in China.This paper analyzes how the indoor oneway closed freeze-thaw cycle experiment changes the physical characteristics of sandy soil under the action of freeze-thaw,and studies the mechanical influence of this process on soil erodibility.The results show that freeze-thaw action will reduce soil bulk density and increase porosity,thus affecting soil erosion.The permeability of soil will increase with the increase of freeze-thaw cycles,and its change trend is very similar to that of porosity.The increase of freeze-thaw temperature difference and initial water content of soil samples will lead to the decrease of soil bulk density and the increase of porosity and permeability.

关 键 词：冻融侵蚀 冻融循环 土壤容重 水土流失 

分 类 号：S157[农业科学—土壤学]