CAJ | 학술논문

运用高压固结仪对压实黄土进行了长期蠕变试验，试验结果发现，压实黄土有很明显的蠕变变形，蠕变变形占总变形的6%～23%。试样含水率越高，压实度越小，蠕变占总变形的比例也越大，随着应力水平的提高，蠕变占总变形的比例减小。提出了适合描述压实黄土变形规律的非线性经验蠕变模型，结合分层总和法，对此模型进行了验证，并运用此模型，研究了不同含水率、不同压实度下黄土高填方工后沉降的变化规律，发现工后沉降与填料压实度和含水率之间符合对数关系。若以工后沉降速率v<0.1 mm/d为工后沉降稳定标准，则高填方沉降在工后200～650 d稳定，且压实度越高，含水率越低，沉降稳定需要的时间越长。
운용고압고결의대압실황토진행료장기연변시험，시험결과발현，압실황토유흔명현적연변변형，연변변형점총변형적6%～23%。시양함수솔월고，압실도월소，연변점총변형적비례야월대，수착응력수평적제고，연변점총변형적비례감소。제출료괄합묘술압실황토변형규률적비선성경험연변모형，결합분층총화법，대차모형진행료험증，병운용차모형，연구료불동함수솔、불동압실도하황토고전방공후침강적변화규률，발현공후침강여전료압실도화함수솔지간부합대수관계。약이공후침강속솔v<0.1 mm/d위공후침강은정표준，칙고전방침강재공후200～650 d은정，차압실도월고，함수솔월저，침강은정수요적시간월장。
A series of long-term 1D oedometer test on compacted loess has been conducted using a high pressure consolidometer. It is found that the compacted loess has remarkable creep deformation and the proportion of the creep deformation in total deformation can come up to 6%-23%. The creep deformation proportion goes higher as the water content of the sample increases and the compaction degree reduces. And the creep deformation proportion decreases with the increase of stress level. A nonlinear creep model, which can well describe the rules of post-construction settlement of compacted loess, is proposed. The validity of model is verified by comparing the results from proposed model with those from the layer-wise summation method. The proposed model is employed to examine the variation law of the post-construction settlement under the conditions of the different water contents and compaction degrees. It is found that there exist logarithmic relationships between the post-construction settlement and the compaction degree/water contents. Supposing the velocity of the post-construction settlement v<0.1 mm/d is the stabilized standard, the high embankment settlement trends to be stable in 200 to 650 days after construction. The higher the compaction degree is, the lower the water content is, the longer the time up to stable required is.