周期温度边界条件下一维融化固结特性研究

发布时间：2018-04-01 17:02

  本文选题：周期温度边界　切入点：融化固结行为　出处：《冰川冻土》2014年04期

【摘要】：在周期温度边界条件下,冻土呈现出与常温边界不同的融化固结特性.基于融化固结理论提出了一种适用于周期温度边界条件下融化固结计算的数值模拟方法,并通过试验验证了该方法的有效性.通过对比分析试验及数值结果表明,提出的数值方法能够很好地描述周期温度边界条件下冻土的融化固结特性.同时,融化深度和变形均随时间呈现出阶梯型的变化趋势.这是周期温度边界下土体融化固结行为最显著的特点.随着冻融次数的增加,融化深度和变形均趋近于常温边界条件下的结果,这表明若干个冻融循环后周期温度边界对融化固结行为的影响将逐渐消失.
[Abstract]:Under the condition of periodic temperature boundary, the frozen soil exhibits different melting and consolidation characteristics from the normal temperature boundary.Based on the thawing consolidation theory, a numerical simulation method for the calculation of melting consolidation at periodic temperature boundary conditions is proposed, and the validity of the method is verified by experiments.The experimental results and numerical results show that the proposed numerical method can well describe the thawing and consolidation characteristics of frozen soil under periodic temperature boundary conditions.At the same time, the melting depth and deformation show a ladder trend with time.This is the most obvious characteristic of soil melting and consolidation behavior at periodic temperature boundary.With the increase of freeze-thaw times, the thawing depth and deformation tend to the results of the boundary condition at room temperature, which indicates that the influence of the periodic temperature boundary on the thawing consolidation behavior will gradually disappear after several freeze-thaw cycles.
【作者单位】： 兰州大学土木工程与力学学院;中国地震局兰州地震研究所;
【基金】：国家自然科学基金项目(41201064;50978239) 中国科学院寒区旱区环境与工程研究所人才成长基金项目(Y451091001)资助
【分类号】：U416.1
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本文编号：1696457