关键词: 弃渣场边坡; 暂态饱和区; 边坡稳定性; 非饱和土; 基质吸力;

Abstract: In order to clarify the instability mechanism of the slope of the slag yard under rainfall conditions, the abandoned slag yard of a highway from Daozhento Weng′an City in Guizhou Province was taken as a research object.Based on indoor test parameters, we used the SEEP/W module in GEO-Studio to study the distribution of transient saturation zone of abandoned slag yard slope under rainfall conditions and also applied the SLOPE/W module to obtain relationship between slope stability and the distribution of transient saturation zone.It is concluded that:(1)The effect of rainfall on the stability of the slag slope will last for a long time even after the rain stops.During this period, the safety factor will continue to decrease and finally reach the minimum value.(2)It takes only a short period for the slope transient saturation zone to develop to the whole slope, during which the slope safety factor declines fastest.After the formation of the transient saturation zone on the slope, the influence of rainfall on the stability of slope is significantly reduced.

Key words: abandoned slag yard; transient saturation zone; slope stability; unsaturated soil; matrix suction;