Basis of pit slope design mechanics and parameters sensibility analysis

摘要

Based on the previous research results and in considerations of the slope rock mass under the action of both dead-load stress and horizontal tectonic stress, spatial mechanical analysis is carried out with the elastic mechanics method of the inversely truncated tapered pit surface. The relationship between the designed slope angle, the rock physical and mechanical parameter, excavation radius and radial component of the horizontal tectonic stress are derived to provide the theoretical basis for rational slope design and for the reduction of overburdens from the furrow pit. And based on the nonlinear mapping function of the artificial neural network and with the help of RBF artificial neural network model, sensibility analysis is implemented for the parameters affecting the slope angle design. The results of the case study showed that the radial component σr of the horizontal tectonic stress toward the rock mass, bulk density y and rock mass friction factor / are the primary influencing factors, while the open pit radius r and ring modulus Eθ are the secondary considerations.