传统一维固结仪只能进行基础的固结试验,由固结仪得到的试验曲线也不能称为蠕变曲线。基于一维固结仪,将土样制成高为6.0 cm,直径为6.18 cm的圆柱形试样,并在试样中心沿直径方向钻孔,人为提供土体破坏空间。综合考虑不同含水率(23.8%,20.1%,15.5%),不同垂直压力(125,175,225,275 kPa)条件下,通过分别加载的方式,得到了较为可靠的试验数据,并利用在孔内放置摄像探头的方式,全程观测黄土蠕变各个阶段的变化。该方法解决了传统固结仪由于环刀的限制,只能得到蠕变试验的衰减、稳定2个阶段的问题,实现了蠕变的衰减、稳定、加速完整3个阶段,具有操作简单,影响因素少,数据可靠性较强,更能直观地观察黄土蠕变土体变化的优点。

In this paper, a new creep test method for loess is proposed based on improved one-dimensional consolidation instrument. Boreholes are made on cylindrical loess specimens (height 6.0 cm and diameter 6.18 cm) to facilitate artificial damage space. Creep tests are conducted under different vertical loads (125 kPa, 175 kPa, 225 kPa, and 275 kPa) at different moisture contents (23.8%, 20.1% and 15.5%). Reliable test data are obtained by loading separately, and the changes of loess creep stages are observed by placing a camera probe in the borehole. By using this method, three stages of creep, namely, attenuation, stable, and acceleration, can be obtained rather than only attenuation and stable stages due to the limit of ring knife in WG-type consolidation instrument. The proposed method is of simple operation, few influential factors, and strong reliability, hence can be used for directly observing the changes of loess creep.