Dynamic Analysis of Tectonic Blocks 1 and 2 of Choghart Open-Pit Mines under earthquake: A Case Study

Rock slope stability for tectonic blocks 1 and 2 of Choghart open pit mine under sceismic load was analyzed in 3-D using the finite difference technique 3DEC. The seismic load was from the 2005 Bafgh Earthquake with 0.13g PGA and 57 sec. duration. The mine is divided into 4 blocks according to tectonic and rock mass properties. Blocks 1 and 2 have a slope angle of 50 degrees and are expected to fail in wedge and planar failure types, respectively. Rock joint propagation patterns in FD models were generated using statistical methods to try to represent their natural form. According to the results fromstatic analysis, blocks 1and 2 are stable with safety factors of 1.6 and 1.5, respectively. For dynamic analysis, 6 seconds of the earthquake wave with the highest accelerations were applied to the model at 0.005 sec. time steps with 0.5% damping. The results showed that block 1 is unstable with a safety factor of 0.8, whereas block 2 has a safety factor of 1.2 and is stable

کلیدواژه ها:

rock slope stability ، joint propagation ، dynamic analysis ، safety factor ، open pit mine