Stability Analysis Of High And Steep Rock Slope In Gongchangling Open-pit Mine

Aiming at the stability of rock high and steep slope of Gongchangling Open-pit Iron Mine under blasting vibration,according to the criterion of slope determination and theory of blasting vibration calculation,the method of strength reduction is applied to analyze the stability state of slope under static load and blasting vibration load.In addition,the cusp catastrophe theory is introduced into the dynamic stability analysis of open pit slope,which expands the application criterion of finite element strength reduction method.At the same time,the sensitivity of slope safety factor to tensile strength under static load and blasting vibration load is analyzed based on the theory.The main research contents and conclusions are as follows:Through field engineering geological survey,the occurrence and distribution of structural planes of ore bodies and rock masses in the study area of Gongchangling Open-pit Iron Mine are systematically investigated,and the rock mechanics tests of ore bodies and rock masses are carried out indoors.On this basis,the quality of ore body and rock mass in the study area are evaluated,and the deformation and strength parameters of ore and rock mass are estimated by Hoek-Brown and Mohr-Coulomb criteria.By the study above,the main parameters are provided for reference of subsequent numerical calculation.Based on the propagation characteristics of blasting vibration load in rock slope,the blasting load is equivalent to triangular seismic vibration wave applied to the boundary of blasting hole's crushing zone.The simulation analysis is carried out by FLAC3 D,the safety factor of slope under static load is 1.37,and the potential slip surface curve equation of the slope is determined.The safety factor of slope under blasting vibration load is 1.34,and through the propagation of blasting vibration wave in the slope and the evolution of plastic zone,the influence of blasting vibration load on slope stability is dynamically analyzed.The catastrophe theory is introduced into the slope stability analysis,and the cusp catastrophe model of slope top horizontal displacement and strength reduction factor are established.By using the catastrophe model,it is concluded that the safety factor of the slope is 1.36 under static load,and that under blasting vibration load is1.34,which in agreement with the results of the previous analysis.In addition,based on the cusp catastrophe model,the sensitivity of slope safety factor to tensile strength slope is analyzed.The results show that the sensitivity of slope safety factor to tensile strength under dynamic load is greater than that under static load.