In light of the issues on frequent destruction derived from slump and shallow landslide of loess slope after rainfall

the study mainly focuses on revealing internal moisture-heat change process of unsaturated loess slope under rainfall infiltration and sunshine evaporation. This research employed a laboratory loess slope model

regulated the rainfall-insolation cycle

and monitored the temperature

moisture and surface displacement. The results show that the depth affected by internal temperature and water infiltration of unsaturated loess slope is limited; in the range of 30~40 cm

under conditions of rainfall and sunshine. These show that

generally

the destruction depth of loess slope with slump and instability is limited

which mostly is a shallow slump. With the change of rainfall and sunlight

the slope surface displacement in the model occur a slight deformation on expansion or contraction.