Synthetic reinforcement of complicated and broken open pit slope

In order to carry out steep open pit cutback in Jinfeng,which has a very complicated and broken rock condition,and at the same time decrease the stripping ratio,a study of its four main failure mechanism,namely,planar,wedge,toppling and sliding was conducted,giving fully consideration to factors likes of batter angle,rock bedding,rockmass quality and crucial priorities of batter in different domains.The slope supporting methods are as follows: mesh+split sets+shotcrete+cable bolts,cable bolts + mesh stripe,mesh+shotcrete+split sets,sheer pins and high density polyethylene(HDPE) membranes,total reinforement area reaches 53 200 m2,which enables successful cutback mining with the face angle at 55° 65°,overall angle of wall at 34° 40°,the maximal height of slope with 275 m.Based on years of practice and experience,a comprehensive analysis of action mechanism of above mentioned reinforcement methods,their application scope,technical parameters and implementation procedures,as well as the effect,pros and cons of these methods are presented.