On obtaining jointed rock slope geo-parameters and the application of PFC2D

Safety production of open-pit mine mainly depends on the stability of slope. The first step to investigate the stability of slope by using particle flow code is to obtain a series of reasonable characteristic parameters which are mainly controlled by strength of rocks and distribution of joints. By virtue of a project case in Heishan open-pit mine, one of the iron ore mines of Hebei Iron and Steel Group Mining Company (HBIS), the application of an approach to obtain the characteristic parameters of jointed rock slope is presented in this paper. The strength of rock and distribution of joints were investigated by rock point load instrument system and ShapeMetriX3D system separately. The Hoek-Brown failure criterion is found suitable to estimate geo-mechanical parameters. Then the values are applied to the numerical simulation of PFC2D. Through this study, an vision of where the failure started, how it developed and what the final failure looked like during the process of mining the hanging wall ore is put forward and the simulation results which are similar to the site survey and similarity models give a reference to guide the slope deformation monitoring.