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针对研究区(黑方台地区)黄土的非饱和蠕变特性,采用改进型的FSR-10非饱和三轴蠕变仪进行了基质吸力控制条件下的三轴蠕变试验,研究发现:(1)当施加的偏应力较小时,黄土的变形较小,并具有一定程度的可恢复性,随着偏应力的增加,土颗粒需经过较长的时间才能够移动到新的位置,达到新的平衡,当偏应力增加到一定程度时,颗粒移动难以达到平衡,土样发生破坏。(2)在其他条件相同的情况下,围压与试样产生的变形量呈负相关,且围压越小,变形达到稳定所需的时间也越长;(3)在围压和偏应力水平一定的情况下,土体的变形量随基质吸力呈负相关,且基质吸力越小,蠕变曲线达到稳定所需的时间越长。
According to the unsaturated creep characteristics of loess in the study area (Heifangtai area), a three-axis creep test under matric suction control conditions was carried out with an improved FSR-10 unsaturated triaxial creep tester. The results show that: (1 ) When the deviatoric stress is small, the deformation of loess is small and has a certain degree of recoverability. With the increase of deviatoric stress, it takes a long time for soil particles to move to a new position, reaching a new Balance, when the deviatoric stress increases to a certain extent, it is difficult for the particles to move to balance and the soil sample is damaged. (2) Under other conditions, the confining pressure is negatively correlated with the deformation of the specimen, and the smaller the confining pressure, the longer the time required for the deformation to stabilize. (3) In the confining pressure and deviatoric stress Under the condition of certain level, the deformation of soil mass is negatively correlated with the matrix suction, and the smaller the matrix suction, the longer the creep curve needs to reach its stability.