Study On The Open Pit Slope Design And Evaluation Of Slope Stability Under Construction Disturbance

In view of the insufficient available mineral resource resulting from the global heavy exploitation, intensive research is made on the mechanics basis for the open pit slope optimization through the effective mining of the measured resource by reducing ore mining loss and dilution. Open pit numerical model is developed. In consideration of lack of thorough research on the slope stability under the construction disturbance, systematic analysis is conducted on the slope stability under the disturbance from the bench blasting operation and dynamic load of the heavy-duty mining vehiclesThe research is focused as follows.1. Determining the mechanics parameters of the slope rock mass based on the geological exploration report, rock laboratory tests, and mine site prospecting data, sub-area of the slope quality are evaluated and classified with the help of RMR system. The rock mass strength and transformation parameters much closely reality by using Hoek Brown criterion is obtained.2. By converting the simply connected domain of the arbitrary complicated boundary into the unit circle domain through complex-variable triangle interpolation and normal iteration convergence, the conformal mapping function between each other is established to realize the analytical modeling solution. The relationships among the pit slope angle and relevant rock mechanics parameters, the excavation radius radial component of the horizontal structure stress is derived, which can help to design the open pit slope shape. The sensitivity analysis of parameters affecting the slope stability is completed through RBF neural network model.3. A3D numerical model with high accuracy is obtained by means of numerical simulation with a lot of mine basic data by using MapGIS, Midas, AutoCAD. FLAC3D and Surpac.4. Designing the bench blasting scheme in the open-pit through the combination of the pre-splitting blasting with deep-hole bench blasting. The time-related response process of the moving displacement, accelerated velocity and dynamic stress of the slope under the blasting loads is analyzed.5. By modeling the dynamic response of the slope under the vehicle loads as a response of the system with input and output, the truck-road coupling model is established, and the bench dynamic stability under different operating modes (empty, fully-loaded and overloaded) of the vehicles is analyzed for the first time.6. In view of randomness, ambiguity, variability and uncertainty of the factors affecting the slope stability, ANFIS evaluation model is applied to develop the non-linear mapping relationship between the slope stability index and the stability. In comparison with the neural network method, the calculation results are closer to the actual slope condition.