Stability Analysis And Treatment Study Of Goaf In Zhujiaba Copper Mine

With the development of mining technology and the increase in demand for mineral resources at home and abroad,the scale of mining resources has also increased.During the mining process,a large number of goafs are formed,and there are certain safety hazards,which can easily cause disasters such as roof fall,collapse and ground subsidence,which threaten the life and property safety of underground workers.Therefore,it is particularly important to control the goaf.This paper takes the mined-out area left over from the Zhujiaba Copper Mine in Wuding County as the research object.Based on the local surface settlement that has occurred in the mined-out area of the mine,the method combines on-site field investigation,theoretical analysis and numerical simulation.The stability of the mining area of the mine was evaluated,and a filling treatment plan was formulated based on the evaluation results.The paper mainly got the following conclusions.(1)Through on-site field investigation and sorting out relevant data,the results show that the mined-out area currently stranded in the mine has a high risk of damage,has a certain degree of impact on the surface,and has caused surface subsidence.At the same time,through theoretical analysis of chain instability in the goaf,it is calculated that the proportion of pillars instability is 65.1%,and the pillars have a higher risk of instability;at the same time,the calculation results show that the roofs of the 7 goafs have potential The mined area of the mine belongs to the level I unsafe state.(2)According to the spatial occurrence state of the ore body,use MIDAS to establish a threedimensional spatial physical model of the mined-out area,and use FLAC3 D numerical simulation software to analyze the displacement field,stress field,and surface deformation and settlement of the mining process.The analysis results show that both the current situation and the mined-out area after the end of the mining have a higher risk of instability,and greater harm to the surface.(3)Combining the results of theoretical calculations and numerical simulations,the analysis shows that the ground subsidence is 30-50 cm after the end of the mining,and the surface impact range is 140-185 m.65.1% of the pillars have been deformed and damaged,and the roof has a higher risk of collapse It is more consistent with the theoretical analysis results.(4)Through the analysis of the results of the displacement and settlement monitoring points,it is known that the displacement and settlement of the pillar and the ground is mainly affected by the stoping process and the filling sequence.Therefore,this paper proposes two filling treatment schemes for the current goaf and the whole area.The filling effect of the whole area is obvious.On the basis of controlling the surface settlement,it can effectively reduce the surface settlement range from 140 to 185 meters.It is 45 to 75 meters.It provides scientific data support for the subsequent safe mining of mines,and also provides a certain reference for the stability analysis and management of goafs in other similar mines.