Numerical simulation of complex slope stability and reinforcement measures in a deep concave open-pit mine
At present,a certain gold mine adopts open-pit mining for production,which has formed a slope with a height of about 400 m.The western slope and other areas have been affected by multiple intersection faults and have experienced instability and sliding,seriously threatening the safety of mining production.As the mining depth continues to increase,the stability of the slope further decreases,and there is an urgent need to conduct research on the stability and support methods of the slope.On the basis of relevant indoor experiments,numerical simulation methods were used to establish a three-dimensional model of the mining area.From the perspectives of stress,displacement and shear strain increment,the stability of the study area during the expansion process to the final boundary was analyzed,and corresponding reinforcement schemes were proposed.The results showed that as excavation continued,the open-pit slope gradually entered an unstable state due to the influence of faults,self-weight ground,groundwater and earthquake,and ultimately became unstable.When prestressed anchor cables with anchorage length of 12 m,free length of 25 m,36 m,and 37 m,inclination angle of 20° and spacing of 4m were used in the fault area for reinforcement,the slope could remain stable.The research results provide theoretical basis for mine design and production.
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