Nonlinear FEM Analysis on Over-break Problem in Underground Engineering

Abstract:

In this paper,a 3D numerical model is calculated by nonlinear FEM analysis.The influence of different over-break conditions(different position,amount,depth etc) to the stability of surrounding rocks has been analyzed.The results showed the influence range of plastic zone and stress focus on the over-break position.Those are very important references in underground opening and initial support lining design.