To reveal the cause and the effects for the slope deformation failure mechanism and stability of the ground swelling

combining with the Baiyinhua No.1 open-pit coal mine of the east working slope engineering practice

according to the limit equilibrium theory

the shear strength parameters of the 2

#

coal roof weak layer is determined by using inversed analysis and the slope stability in the plunking-up floor area is evaluated on the basis of slope engineering geology.The numerical simulation of the optimized slope is simulated by Flac3D software

the study indicates that weak layer of the 2

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coal seam and ground swelling are the decisive factors to control the stability of the slope.The slope slide model of the

plunking-up floor area is a combined sliding of shear arc-weak layer-ground swelling crack.Selecting security reserve coefficient is 1.1

the status quo slope of the 5

6

profile is to meet the requirements of saftey

and the status quo of the 1

4

profile is not satisfied with the security requirements.The original design slope of the 1

4

profile is not steady.Unstable slope is optimized and gived treatment by cutting slope

the overall slope angle of No.1 profile is 22° and No.2

4

profile is 24° after optimizing.Research can provide guidance for the eastern slope of Baiyinhua Surface Mine in treatment

for the safe production of similar open-pit mine has a certain reference value.