Numerical Simulation Analysis of Layered Slope Landslide Mechanism in Open Pit Mine

There have been 7 local landslides accumulatively in Nanfen Open-pit Iron Mine since 2010, all of which issued early warning information prior to 4–8 h and avoided danger successfully. However, traditional anchor materials are usually broken off because they don’t adapt to the large deformation of slope rock in the monitoring process, leading to the result that the numerical simulation method cannot reach the goal of analyzing force, deformation, sliding surface linking up and the whole process of failure of slope body. Therefore, firstly reveals the characteristics of the whole failure process of slope rock mass from cracks, expansion, penetration, disintegration and slippage, according to the evolution law of the monitoring curve of large-deformation cable with constant resistance (NPR cable) in “landslide 16-1101”; then, builds the large-deformation numerical analysis mechanics model of NPR cable using 3DEC, and carries out the numerical modeling calculation on the whole process that the deposits load of “13-0223 landslide” induces “16-1101 landslide”. Finally, carries out the contrastive analysis on the measured result and simulation result, finding that there is a significant consistency between them. It is proved that the large-deformation numerical analysis model of NPR cable can meet the large deformation of rock mass without being pulled off and broken.