Study of Stability of Multi-layer Complex Mined-out Areas based on FLAC3D
The metal mining of a certain mine located in the level of-360 has been basically completed,leaving behind a large number of complex mined-out areas that pose serious risks to the mining of surrounding ore bodies and the safety of underground workers.Through precise detection of mined-out areas and three-dimensional modeling technology,the three-dimensional morphology and precise data of mined-out areas are mastered.FLAC3D finite difference method is used to analyze the distribution of stress,displacement and plastic zone of surrounding rocks.The results show that most of the stress in the mined-out areas is concentrated in the upper middle part of the roof.Numerical simulation and mechanical analysis show that there is a possibility of roof collapse in the mined-out areas.Therefore,it is necessary to minimize disturbance to the large mined-out areas,reasonably arrange the span of the mining area and optimize the parameters of the mining area.And meanwhile attention should be paid to the changes in tensile stress and large displacement at the corners of the mined-out areas,so as to reduce the vibration impact of mining and blasting around the mined-out areas on the mined-out areas,and the mined-out areas should be filled in a timely manner.
万方数据
维普
