CAJ | 학술논문

通过室内试验模拟自然沉积作用下黄土中水的渗透性，发现黄土垂直节理是地表水入渗过程中形成的。根据室内模型试验，建立一理想颗粒排列模型，利用 TEN-15型张力计实测的土水特征曲线，计算从饱和到非饱和状态的变化过程中土颗粒的相互作用力的变化。结果表明：地表水在下渗过程中，初始沉积的黄土含水量发生变化，基质吸力和表面张力产生的粒间引力也发生变化；粒间引力会随着粒间距的减小而急剧增大，而且其随含水量的变化规律与粒间距的大小有很大关系；由于初始沉积的黄土粉粒结构疏松，粒间有极弱的支撑，改变含水量状态产生的粒间引力在较小的量级便会使土颗粒相互靠近，而颗粒间距减小，则粒间引力急剧增大，土体整体收缩导致局部拉裂形成垂向裂隙，即垂直节理。
통과실내시험모의자연침적작용하황토중수적삼투성，발현황토수직절리시지표수입삼과정중형성적。근거실내모형시험，건립일이상과립배렬모형，이용 TEN-15형장력계실측적토수특정곡선，계산종포화도비포화상태적변화과정중토과립적상호작용력적변화。결과표명：지표수재하삼과정중，초시침적적황토함수량발생변화，기질흡력화표면장력산생적립간인력야발생변화；립간인력회수착립간거적감소이급극증대，이차기수함수량적변화규률여립간거적대소유흔대관계；유우초시침적적황토분립결구소송，립간유겁약적지탱，개변함수량상태산생적립간인력재교소적량급편회사토과립상호고근，이과립간거감소，칙립간인력급극증대，토체정체수축도치국부랍렬형성수향렬극，즉수직절리。
It is observed that the loess vertical joints form in the process of rainfall penetration by the model test for simulating loess penetration under the sedimentation.According to the model test,an ideal model of soil particle arrangement was built;based on the soil-water characteristic curve of loess sample measured by TEN-15 tension meter,the interaction force between soil particles under different moisture contents was induced by the relationship between matric suction and curvature radius of water shrink film.The results show that the vertical joint is caused by the change of inter-particle force because of the matric suction and surface tension in the process of rainfall penetration;the inter-particle force increases sharply with the decrease of the inter-particle distance,and the relationship between the inter-particle force and water content is significantly influenced by the inter-particle distance;the structure of initial sediment loess is loose and the support of inter-particle is weak,so that the particles will be close to each other because of the inter-particle force at small order caused by the change of water content,and the inter-particle force increases sharply with the decrease of the inter-particle distance,and then the shrinkage of soil leads to local cracks and forms vertical joints.