基于一维固结试验的压实黄土蠕变模型

发布时间：2018-01-13 01:07

本文关键词：基于一维固结试验的压实黄土蠕变模型　出处：《岩土力学》2015年11期 　论文类型：期刊论文

【摘要】：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v0.1 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。
[Abstract]:The use of high-pressure consolidation apparatus for the long-term creep tests on compacted loess, the test results show that the creep deformation of compacted loess has obvious creep deformation, water samples of 6%~23%. total deformation rate is high, the compaction degree is small, the proportion of the total creep deformation increases with the increase of stress levels, the total creep the proportion of deformation decreases. Proposed for describing the nonlinear empirical creep model deformation of compacted loess, the layer wise summation method, this model is validated, and using this model, effects of different water content, different degree of compaction variation of loess high fill settlement, a logarithmic relationship was found between the settlement and the the degree of compaction and moisture. If the settlement rate of v0.1 mm/d for the settlement of high embankment settlement is stable, in the industry after 200~650 D is stable, and the compaction degree is higher, the lower water content, stable subsidence The longer it takes.

【作者单位】：西安理工大学岩土工程研究所;机械工业勘察设计研究院;
【基金】：国家科技支撑计划项目(No.2013BAJ06B02) 国家自然科学基金项目(No.51179153,No.51308456)~~
【分类号】：TU444
【正文快照】： 1引言一般地,土体在上覆荷载的作用下其变形的发展不会立刻完成,而是随着时间的推移逐渐增长,称之为土的蠕变。土体的蠕变概念源于固体材料力学,它的大小与土体的种类、荷载持续的时间以及周围的环境有关。对于西部地区覆盖层较厚的黄土来说,其蠕变可能在几天就完成,也可能需

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