3D Detection And Numerical Analysis Of The Pillar's Instability In Deep Mine

In some mines, the great ground pressure appeared is directly related with the unstable pillars, which are important parts of rock mass structure. Therefore, the study of pillars'stability not only provides theoretical significance for mining, but also has important practical sense in improving safety management and maintenance of normal mine production safety.At present, owing to mining of "take one every the other one", one side of the pillars is facing space, and the pillars'instability problem is increasing. Aiming at the problem of pillars in deep well of Dongguashan Copper Mine, closely combining the research project "the application and study of Dongguashan Copper Mine cavity 3D monitoring technology", based on consulting and analyzing relevant literature about deep mining pillars'stability at home and abroad, the research was carried out with the technology of cavity 3D detection,3D modeling and numerical simulation as follows:(1)The collapse zone formed by the instable pillar has been being detected by 3D Cavity Monitoring System (CMS). According to the data, the 3D solid models of collapse zone and the pillar's collapse area were obtained rapidly and accurately through mining software Surpac.(2)According to the 3D solid models, the location and the scope of the collapse zone were accurately confirmed, the volume and the amount of the collapse area in pillar were calculated and gained.(3)RFPA was adopted to simulate the damaging process of the pillar(one side is facing space and the other is solid), through analyzing the acoustic emission characteristics, the process of crack from initiation to extending to run through inside the pillar is inversion, and the destruction mechanism of deep pillar was revealed preliminarily.(4)Based on the detected cavity, using Phase2 to study about the pillar's stability influenced by the adjacent stope mining, and the parameters including stress, displacement and yield unit were analyzed, also the deformation law of the pillar was obtained. (5)With the numerical simulation results, linking with the detection outcome, the cause of the pillar's failure was analyzed, and safety management and control measures about pillar's failure were proposed.The research results have important practical significance in arranging mining mode, effectively predicting and analysis of pillar's safety, avoiding disaster occurring, safely and efficiently exploitation of mine.