水泥土流变特性的试验研究

发布时间：2018-07-05 18:59

本文选题：水泥土 + 流变试验　；参考：《地下空间与工程学报》2016年S2期

【摘要】：利用土体流变试验机对温州地区水泥土进行了流变试验,研究结果显示:水泥土具有较强的流变性,水泥土的流变特性随轴向应力水平的增大而加剧;同一围压下,轴向应力水平越大,应变速率也越大;水泥土的瞬时变形非常显著;随着围压的增大,流变变形有减小的趋势,围压对水泥土的流变变形起限制作用。水泥土的流变特性可以采用经验模型和三维Burgers模型进行描述。对水泥土的电镜照片进行分析,发现水泥土内部存在着许多裂纹、孔隙等初始损伤。随着应力水平提高,水泥土体内部出现新的损伤;应力水平越大,持续时间越长,损伤积累越多,因此水泥土流变特性随应力和时间增加而加剧,稳态速率增加。
[Abstract]:The rheological test of cement soil in Wenzhou area was carried out by using the soil rheological testing machine. The results showed that the rheological properties of cement soil increased with the increase of axial stress level, and the rheological characteristics of cement soil increased with the increase of axial stress level, and under the same confining pressure, The greater the axial stress level, the greater the strain rate; the more obvious the instantaneous deformation of cement-soil is, the smaller the rheological deformation is with the increase of confining pressure, and the confining pressure is limiting the rheological deformation of cement-soil. The rheological properties of cement soil can be described by empirical model and three-dimensional Burgers model. It is found that there are many cracks, pores and other initial damage in the cement soil. With the increase of stress level, new damage occurs in cement soil, and the larger the stress level, the longer the duration, the more damage accumulation, so the rheological characteristics of cement soil increase with the stress and time increase, and the steady state rate increases.
【作者单位】：中国电力建设集团华东勘测设计研究院有限公司;天津城建大学土木工程学院;天津城建大学天津市软土特性与工程环境重点实验室;
【基金】：中国电力建设集团科技项目(SD2013-10)
【分类号】：TU41

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