CAJ | 학술논문

甘肃省永靖县黑方台地区灌溉水下渗导致地下水位抬升,加之季节性冻结滞水促滑效应的影响,进而诱发了大量黄土滑坡. 为了进一步研究地下水长期作用对黄土强度的影响,采用环剪仪装置开展了不同饱水时间下(1,3,5,7,10,15,20 d)重塑黄土的强度试验研究. 试验结果显示,黄土强度饱水时间曲线呈"勺形",指出"勺底"数值更符合完全软化强度的定义,并且从水、土相互作用的微观角度对曲线形状作出了合理解释.初步认为,该地区饱水3d左右的抗剪强度接近于完全软化强度.
감숙성영정현흑방태지구관개수하삼도치지하수위태승,가지계절성동결체수촉활효응적영향,진이유발료대량황토활파. 위료진일보연구지하수장기작용대황토강도적영향,채용배전의장치개전료불동포수시간하(1,3,5,7,10,15,20 d)중소황토적강도시험연구. 시험결과현시,황토강도포수시간곡선정"작형",지출"작저"수치경부합완전연화강도적정의,병차종수、토상호작용적미관각도대곡선형상작출료합리해석.초보인위,해지구포수3d좌우적항전강도접근우완전연화강도.
The infiltration of irrigation water in Heifangtai loess plateau, Yongjing County Gansu Province, elevates the under-ground water level and triggers dozens of loess landslides due to sliding-promoting effect of seasonal frozen stagnant water. In or-der to study the long term influence of groundwater on strength of loess, the ring shear apparatus was used to study the shear strength variation of saturated remodeled loess with different saturation time (1, 3, 5, 7, 10, 15d and 20d). The test result shows that the shape of strength-saturation time curve is in the shape of "spoon", and the value at the spoon bottom conforms with the definition of fully softened strength. Then the curve shape is analyzed in term of interactions of water and loess in a micro perspective. It is preliminarily concluded that the shear strength of 3d saturated time closes to the fully softened strength in Hei-fangtai area.