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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。
The rheological tests of cement soil in Wenzhou area were carried out by using soil rheology testing machine. The results show that the cement soil has strong rheological properties, and the rheological properties of cement soil aggravate with the increase of axial stress. The higher the axial stress level is, the larger the strain rate is. The instantaneous deformation of cement soil is very significant. With the increase of confining pressure, the rheological deformation tends to decrease. The confining pressure affects the deformation of cement soil Play a limiting role. The rheological properties of cement soil can be described by empirical models and three-dimensional Burgers model. The analysis of the electron micrographs of cement soil shows that there are many initial cracks such as cracks and pores in the cement soil. With the increase of stress level, new damage occurs in the soil. The longer the stress level and the longer the duration, the more the damage accumulates. Therefore, the rheological properties of cement soil aggravate with the increase of stress and time, and the steady-state rate increases.