Abstract:

Based on the engineering geological and mining conditions of the Wang’ershan gold mine，numerical simulation method was applied to study the mining-induced rock mass movement and shaft deformation.By numerical calculation，the regularities of the disturbed stress and displacement fields of rock body were put forward.The characteristics of shaft deformation were comparatively discussed under filled and non-filled mining conditions.The study results showed that the equilibrium state of the in-situ stress field was destroyed by the underground mining activities.The occurrence of the mine goaf imposed strong impact on the principal stress field of the pitshaft.The maximum principal stresses were small and sometimes turned into tensile stresses at the shallow part of the pitshaft，which was detrimental to the pitshaft stability.In contrast，the displacements of the pitshaft were greatly decreased when the mined-out space was filled.Thus，the filling body played an important part in the restriction of the surrounding rock mass movement and the promotion of the pitshaft stability.It suggested that filling the mining goaf is a necessary measurement to avoid pitshaft deformation and rupture in future mining.

Key words: Numerical simulation, Stress field, Displacement field, Pitshaft deformation