Yining mining area is located in the depression basin between high mountains. Under special terrain conditions

regional rainfall has the climatic characteristics of high intensity but short duration. Due to the low cementation degree

loose structure and poor mechanical properties of the strata in the mining area

in the process of high intensity rainfall

the strength of the weakly consolidated rock mass subjected to rain infiltration greatly decreases

and the stability of the open-pit mine slope sharply decreases

which is prone to instability. In view of the slope stability of weakly cemented open-pit mine in Yining mining area under short-time heavy rainfall

theoretical analysis

FLAC 3D numerical calculation and GeoStudio rainfall simulation method are adopted to study and analyze the influence of slope dip angle

slope height and rainfall intensity on the slope stability of weakly cemented strata. The results show that:(1) The safety factor of slope is negatively correlated with slope height and inclination angle

and with the increase of the two factors

the safety factor generally presents two stages of rapid decline and slow decline.(2) Under the effect of rainfall

the slope deformation of weakly consolidated strata can be divided into four stages: unsaturated infiltration

runoff formation

saturated infiltration and stable pressure relief. With the extension of rainfall time

the slope safety factor decreases greatly.(3) According to the change law of slope stability in Yining mining area with short-term heavy rainfall and weak cementation

a joint slope control method combining “seepage prevention and anchoring” is proposed.