重塑黏土恒压湿化变形试验研究

发布时间：2018-06-06 00:30

  本文选题：非饱和土 + 孔隙比　； 参考：《南水北调与水利科技》2017年06期

【摘要】：针对某重塑黏土,通过常规固结仪,研究了恒压下初始孔隙比、应力及初始饱和度对湿化变形的影响。试验结果显示,应力和初始孔隙比e对湿化变形影响明显,低应力下,变形随e的提高逐渐由膨胀变为压缩;高应力下,试样均发生压缩,压缩量随e的增大而增大;定量分析了湿化变形与应力和e之间的关系。试样湿化稳定时间t0受应力和初始孔隙比e影响明显,t0随应力的增加而增大;低应力下,t0随e的增加而增大,高应力下,t0随e的增加先增大后减小。初始饱和度Sr对湿化变形也有较大影响,低压应力下,试样膨胀量随着Sr的增加先减小后增大,可能存在"最优初始饱和度",使得变形量最小;高压应力下,试样压缩量随Sr的增加而减小,二者可近似用直线拟合。
[Abstract]:The effects of initial void ratio, stress and initial saturation on the wetting deformation of a remolded clay under constant pressure were studied by a conventional consolidation instrument. The results show that stress and initial void ratio (e) have obvious effects on wetting deformation. At low stress, the deformation gradually changes from expansion to compression with the increase of e, and the compression rate increases with the increase of e under high stress. The relationship between wetting deformation and stress and e is quantitatively analyzed. The effect of stress and initial void ratio (e) on the wetting stability time (t _ 0) of the sample increases obviously with the increase of stress, and increases with the increase of e at low stress, and increases at first and then decreases with the increase of e at high stress. Initial saturation Sr also has great influence on wetting deformation. Under low pressure stress, the sample expansion decreases first and then increases with the increase of Sr, and there may be "optimal initial saturation", which makes the deformation minimum. The compression of the sample decreases with the increase of Sr, which can be approximately fitted with a straight line.
【作者单位】： 山东农业大学水利土木工程学院;河海大学岩土力学与堤坝工程教育部重点实验室;LEM3 CNRS
【基金】：山东省重点研发计划(2017GSF16104) 中央高校基本科研业务费专项资助项目(2017B651X14) 江苏省研究生科研与实践创新计划资助项目(KYCX17_0475) 山东省科技发展计划项目(2012GNC11203)~~
【分类号】：TV41
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本文编号：1984141