The recovery scheme determination of steep narrow veins based on 3-D numerical simulation

摘要

The mechanical features of steep orebody, such as roof caving and strata behaviors, differ from inclined orebody obviously. Therefore, it is important to research deeply on stress-strain characteristic of steep orebody for safe production of mine. Based on finite element theory, a 3-D calculation model of a steep narrow fluorite orebody recovery is established by MIDAS/GTS. Three different recovery schemes is designed, which displayed the variation of stress-strain and displacement of orebody and surrounding rock mass in the main construction stages. A comparison is done among these three schemes according to the results of 3-D numerical simulation. It indicates: (1) with preferable surrounding rock condition, orebody recovery has limited impact to the whole region, while the settlement of overlying strata is relatively big. (2) recovery scheme has a remarkable effect on the change of surrounding rocks. (3) backfill plays a significant role for the stability of the goaf. (4) 3-D numerical simulation which reveal the process of orebody recovery excellently can be beneficial for decision-making of engineering.