基于单线法试验的黄土增湿变形非线性模型研究

发布时间：2018-05-21 02:06

本文选题：黄土 + 增湿变形　；参考：《水利学报》2017年06期

【摘要】：黄土增湿变形一般由地面水入渗或地下水位抬升引起,是岩土工程中需要解决的一个技术难题。虽然在该领域有一些研究,提出了描述该变形的本构模型,但是与实际地基中力和水的作用路径有较大差异。本文引入"增湿水平"这一概念来描述黄土的湿度状态,通过开展分级浸水试验,着重研究先施加应力后浸水增湿路径下黄土的湿度状态与增湿变形的相关关系,建立了增湿变形非线性本构模型;用增湿变形系数和湿陷系数的比值与增湿水平关系曲线反映黄土增湿变形的敏感性,分析了竖向应力、土质对黄土增湿变形敏感性的影响;采用不同应力比的增湿水平与侧向变形曲线,分析了增湿过程中的侧向挤出变形规律。
[Abstract]:Loess humidification deformation is usually caused by surface water infiltration or underground water level uplift, which is a technical problem to be solved in geotechnical engineering. Although there are some researches in this field, a constitutive model describing the deformation is proposed, but it is different from the action path of the force and water in the actual foundation. In this paper, the concept of "humidification level" is introduced to describe the wetness state of loess. By means of stepwise soaking test, the correlation between the wetness state and humidification deformation of loess under the first stress and then the wetting path is studied emphatically. The nonlinear constitutive model of humidification deformation is established, the sensitivity of loess humidification deformation is reflected by the ratio of humidifying deformation coefficient and collapsing coefficient and the horizontal curve of humidification, and the influence of vertical stress and soil quality on the sensitivity of loess humidification deformation is analyzed. The horizontal and lateral deformation curves of humidification with different stress ratios were used to analyze the lateral extrusion deformation in the process of humidification.
【作者单位】：中国水利水电科学研究院;西北农林科技大学水利与建筑工程学院;
【基金】：国家自然科学基金项目(51379220,51279171)
【分类号】：TU444

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