静动应力下正常固结黏土循环特性研究

发布时间：2018-03-03 17:05

本文选题：土力学　切入点：循环荷载　出处：《岩石力学与工程学报》2015年06期 　论文类型：期刊论文

【摘要】：利用动三轴仪对天津正常固结饱和黏土进行循环剪切试验,重点研究静偏应力与动应力组合作用下土体动变形、动弹性模量及动孔压的变化规律。结果表明静偏应力对黏土循环特性影响显著。静偏应力为0时,土体产生拉应变,其随动应力增加不断增大,量级为10-3。静偏应力大于0时,土体产生压应变,此时若动静应力比小于1,压应变随动应力增加不断增大;若动静应力比大于1,压应变不断减小。相同静偏应力下,动弹性模量随动应力增加不断减小;相同动应力下,动弹性模量随静偏应力增加不断减小,且土体更易发生应变软化。静偏应力为0或为拉时,动孔压在-1~1 kPa范围波动。
[Abstract]:The three triaxial cyclic shear tests were carried out in Tianjin normally consolidated saturated clay, focuses on the study of static deviator stress and dynamic deformation of soil stress under the combined action of dynamic elastic modulus and dynamic pore pressure variation. The results show the partial stress effect on clay cycle characteristics significantly. Static deviator stress is 0 the soil produces, the tensile strain increases with the increase of the dynamic stress, the order of 10-3. static deviator stress is greater than 0, the soil produces compressive strain, if static stress ratio is less than 1, the compressive strain increases with the increase of the dynamic stress; if the static stress ratio is greater than 1, the compressive strain is reduced. The same static deviator stress, the dynamic elastic modulus decreases with the increase of the dynamic stress; the same dynamic stress, dynamic elastic modulus and static deviator stress increase decreases, and the soil more susceptible to strain softening. The static deviator stress is 0 or pull, dynamic pore pressure in the -1~1 kPa range.

【作者单位】：中国民航大学机场学院;天津大学建筑工程学院;
【基金】：国家自然科学基金资助项目(51308534,51378344) 中央高校基金B类项目(3122014B003)
【分类号】：TU442

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