冻融条件下黏土水理特性研究  

作　　者：闫芃森 白彦臣 陈一阁 高宇[1] 聂堂哲 陈末 

机构地区：[1]黑龙江大学水利电力学院,哈尔滨150000

出　　处：《科技创新与应用》2024年第32期63-66,共4页Technology Innovation and Application

基　　金：黑龙江省普通本科高等学校青年创新人才培养计划(UNPYSCT-2020012)。

摘　　要：土壤是地球表面重要的组成部分,其中水分和养分对农作物的生长至关重要。因此,了解土壤水理特性是农业和环境科学等领域的重要课题。目前,关于黏土的水理特性的研究较少。该研究采用室内模拟试验,对土壤进行反复冻融试验,分别测定冻融黏土在不同初始含水量、干密度和冻融循环次数下的容水度、持水度以及给水度。结果表明,当土样干密度相同、土样初始含水率较低时,容水度和持水度较高;土样初始含水率上升,土样容水度和持水度较小,但给水度几乎没有发生改变。当初始含水量相同、干密度较大时,土样容水度较小、持水度较高并且给水度较低;当干密度减小时,土样的容水度增大、持水度减少并且给水度升高。经历冻融循环后,土样容水度、持水度和给水度减少。当冻融循环次数增加到3次后,容水度、持水度和给水度有所上升,但当土样在经历7次冻融循环后,土颗粒结构和孔隙数量趋于稳定。Soil is an important part of the earth's surface,and water and nutrients are crucial to the growth of crops.Therefore,understanding soil hydraulic properties is an important topic in fields such as agriculture and environmental science.At present,there are few studies on the hydraulic characteristics of clay.In this study,indoor simulation tests were used to conduct repeated freeze-thaw tests on soil to measure the water capacity,water holdup and water yield of freeze-thaw clay under different initial water content,dry density and number of freeze-thaw cycles.The results show that when the dry density of the soil samples is the same and the initial moisture content of the soil samples is low,the water capacity and water holdup are higher;the initial moisture content of the soil samples increases,and the water capacity and water holdup of the soil samples are small,but the water supply is almost unchanged.When the initial water content is the same and the dry density is large,the water holding capacity of the soil sample is small,the water holding capacity is high,and the water yield is low;when the dry density is reduced,the water holding capacity of the soil sample increases,the water holding capacity is reduced and the water yield is increased.After undergoing freeze-thaw cycles,the water capacity,water holdup and water supply of the soil samples decreased.When the number of freeze-thaw cycles increased to 3,the water capacity,water holdup and water yield increased,but when the soil sample experienced 7 freeze-thaw cycles,the soil particle structure and pore number tended to be stable.

关 键 词：黏土 初始含水量 水理特性 冻融循环次数 冻融条件 

分 类 号：S157[农业科学—土壤学]