The Stability And Governance Study Of Complicated Retention Goafs In Longwan Iron Mine

Now China has basically completed the industrialized world and mineral resources have played an important role, but many mines have irrational and illegal exploitation phenomenon, causing complex and over-time goafs and serious geological disasters,which seriously affect the security of exploitation for mines in the process of the mineral resources development and utilization. So the analyzing stability and research treatment methods on the complicated retention Goafs in Longwan have used scene detection,theoretical calculations and numerical simulation combined comprehensive evaluation theory to study.The main contents are the following:1) For the feature of goafs in Longwan ore, VS150 is used to gob accurate measurements and 3Dmine software is used to create three-dimensional visualization model and get span、roof area and volume in order to provide measured data for goaf stability.2)According to geological survey, the rock quality was evaluated by BQ and Q value method. Then the equivalent exposure limit span method and area method are used to calculate the mined-out area of the span and limit exposure area compared with measured goafs to drawn stable evaluation.3)On the basis of the three-dimensional entity model and geological survey, typical empty areas are selected for the study group, and PLAXIS is used to simulate the goaf stress, displacement situation for the classification of goafs stability.4)Using fuzzy theory and analytic hierarchy theory and selecting 10 greater impact factors for goaf stability. Then principle of fuzzy mathematics and AHP is used to validate the identification results. Finally, combining with the stability and comprehensive evaluation and processing method of metal mined area, governance program is proposed and simulation verification is done for Longwan ore mined-out area.