Evaluation of Goaf Stability in Vein Quartz Tungsten Mines Based on Unascertained Measure Theory
Received date: 2020-08-31
Revised date: 2021-03-18
Online published: 2021-07-14
Goaf is a major potential safety hazard of underground mines，and its stability has always been the focus attention of the majority of practitioners.Aiming at the difficulty in analysis and evaluation of the stability of quartz vein type wolframite ore veins and surrounding rocks，and there is no suitable method for analysis and evaluation of the stability of the goaf，the unascertained measurement theory was proposed.Firstly，11 factors affecting the stability of the goaf were selected，which including the mining width and the exposed area of roof，and the impact evaluates was conducted according to the stability classification of the goaf，thus， a single index measure function was constructed for the stability evaluation of quartz vein goaf.Then，the evaluation vector of multiple indexes comprehensive measurement was formed by determining the influence factor weight of each goaf.Finally，the stability evaluation level of each goaf is obtained based on the confidence recognition criterion.The results show that 55 are stable（Ⅰ） among the 191 goaf areas surveyed，82 are generally stable （Ⅱ），25 are less stable （Ⅲ），and 29 are unstable（Ⅳ）.The stability of the single-vein mining goaf of shallow hole retention method is generally better than that of the phase mining goaf，the less stable or unstable goaf is mainly vein zone.The recovery of the pillars greatly accelerates the instability of the goaf.The analysis also shows the mining width and the exposed area are the main factors controlling the stability of the goaf，and for this mining area，the stability limit of the mining width and the exposed area is 16 m and 800 m2 respectively.Based on the highly consistent of the evaluation results with the actual situation of the stability of the goaf，it is considered that the evaluation of the stability of the goaf based on the unascertained measurement theory provides a new way for the stability evaluation of the goaf of the quartz vein type tungsten mine.The two quantitative grading standards of mining width and roof exposed area proposed in this paper can be promoted and used in the analysis and evaluation of the stability of the goaf of the same type of mine.
Guangxiang YE , Zhiqun HUANG , Xiaojun WANG , Shubiao ZHANG , Dong YUAN . Evaluation of Goaf Stability in Vein Quartz Tungsten Mines Based on Unascertained Measure Theory[J]. Gold Science and Technology, 2021 , 29(3) : 433 -439 . DOI: 10.11872/j.issn.1005-2518.2021.03.154
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