| Because of the parallel occurrence of the ore body,the gently inclined multi-layered ore deposit has caused the complexity of its mining technology and increased the difficulty of safe mining.Therefore,the safe mining of gently inclined multi-layered ore deposits has always been one of the focuses of the study.As a main exploration and development project for underground mining,along the roadway along the vein,its stability is an important factor for the safe production of the gently inclined multi-layered ore deposit.Based on this,the Shanghengshan gently inclined multi-layer deposit was chosen as the research object,and comparative analysis,physical similarity experiments,numerical simulations and other research methods were used to systematically study the stability of the roadway along the gently inclined multi-layered ore deposit.By comparing and analyzing the mining methods of gently inclined multi-layered ore deposits,it is concluded that the multi-layer strip mining and post-filling method is most suitable for the mining of gently inclined multi-layered ore deposits.Through the analysis and comparison of the mining methods and application effects of domestic and international gently inclined multi-layered ore deposits,in order to adapt to the development trend of the mining methods for gently inclined multi-layered ore deposits,it is proposed that the multi-layer strip mining and post-filling method be applied to the mining of gently inclined multi-layered ore deposits,which can achieve efficient and cooperative mining of gently inclined multi-layer mines,and effectively increase the mine production capacity.The mining plan was provided for the follow-up study of the stability of roadway along the underground mining of gently inclined multi-layered ore deposits.The deformation characteristics of the middle lanes and segmental veins in the middle of mining are systematically analyzed.Based on the similarity theory,a physical similarity simulation test method was used to construct a physical similarity model of a gently inclined multi-layered ore deposit,and the settlement deformation of the surrounding rock around the middle lane and segmental vein roadway during the mining process was analyzed.The relative settlements of the surrounding rock around the roadway along the vein are all less than 1.0mm.The study shows that the deformation of the roadway along the vein is influenced by the distance between theroadway and the stope and the position of the open mining house.The relationship between the stability of the roadway and the inclination of the ore body in the mining of gently inclined multi-layered ore deposits was explored.FLAC3 D numerical simulation software was used to construct a numerical model for a gently inclined multi-layer deposit.The relationship between the surrounding rock deformation and the relationship between the stress and the orebody inclination angle during the simulated mining process is analyzed.It is obtained that the vertical displacement of surrounding rock around the roadway along the vein is always less than 0.175 mm and there was no significant change in the stress value and distribution status during the mining of gently inclined multi-layered ore deposits.The results showed that the stability of the roadway along the vein was not significantly affected by the change in the inclination of the ore body.In summary,the Shanghengshan gently inclined multi-layered ore deposit is the object of study,and the stability of roadway along the veins during mining after multi-layer strip mining is studied,which can provide guidance for the safe mining of such mines,especially the stability analysis of the roadway. |
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