The monitoring of the deformation of the slope and the time prediction Based on the stress-dilatancy of the soil

通过对桑迪模型边坡在人工降雨和人工切割作用下的变形测量，考察了应变增量比（=压应变增量/剪应变增量比）能否反映边坡破坏前的应力状态。在人工降雨试验中，坡底压应变增量随剪应变的增加而减小，在边坡破坏前趋于零。这说明应变增量比可以作为边坡失稳的一个指标。

The measurement of the deformation of the sandy model slope under artificial rainfall or cutting were conducted to examine whether the strain increment ratio (=compression strain increment/shear strain increment ratio) can shows the stress state in the slope before the failure. In the experiment with artificial rainfall, the compression strain increment at the bottom of the slope decreased with the increase of the shear strain and then became zero just before the failure of the slope. This fact shows the strain increment ratio can be a indicator of the instability of the slope.