Study On The Stability Of The Residual Slope In Shirengou Iron Mine

The slope has much residual hanging wall ore due to reasons of mining technical or economic in the end of Open-pit Mining. At present, due to the strain on the resources of ore, the residual slope is formed after the completion of the mining to maximize the recovery of ore outside the realm. The residual ore bodies of open slope vein up mining through adit. Veining up mining hanging wall ore destroys the slope rock structure, redistributes the body of stress of rock slope, and affects the stability of the slope. Therefore, it is necessary to draw enough attention to the open residual slope stability issues.Taking the veining up the hanging wall ore residual slope of Shirengou Iron Mine for example, establishing three-dimensional numerical model of veining up mining of the high residual slope of Shirengou Iron Mine , and calculating with numerical simulation, it analyzes stability of residual slope by using the large-scale finite element numerical simulation analysis software of ANSYS. Research results show:1) This paper identifies Shirengou iron ore rock mechanics parameters through the interior of rock mechanics testing, and determines mechanical parameters of rock slope according to strength reduction coefficient method.2) Shirengou slope mining iron ore residual three-dimensional numerical model is set up by the use of ANSYS which is large-scale numerical analysis software. The conclusions by calculating and analyzing show: adit clock recovery has little effects on the overall stability of the open-air slope of Shirengou iron ore mining, and mining residual slope is stable.3) The rock mass displacement and tensile stress gradually increases with the clock recovery adit mining depth increasing, which are in adit tunnel mouth, near the fault and on the upper chamber. So the security pillar can be set aside according to the actual situation in the goaf which has relatively larger size. At the same time, bolting and management should be strengthened at adit tunnel mouth and goaf roof, which can ensure safety of adit mining.4) Something must be done for the residual slope's safety management of Shirengou iron ore mining, such as strengthening the observation of residual slope mining and monitoring, focusing on changes of rock mass displacement, which at slope adit tunnel mouth, near the fault, and at the top of the slope.The simulation results can provide reference and guidance for on-site construction. At the same time, it can also be applied to hanging wall slope mining of other similar mines, and it is of great popularization and application value.