Influence of medium-deep hole slot blasting on stope stability of adjacent filling stope
  
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DOI:10.3969/j.issn.1671-4172.2020.01.007
KeyWord:borehole pressure monitoring;deformation monitoring;blasting vibration monitoring;filling stope stability;medium-deep hole blasting
           
AuthorInstitution
LEI Guorong1 (1. 西南科技大学 环境与资源学院,四川 绵阳 ; 2. 金川集团有限公司龙首矿,甘肃 金昌 )
GUO Huiwen2 (1. 西南科技大学 环境与资源学院,四川 绵阳 ; 2. 金川集团有限公司龙首矿,甘肃 金昌 )
YIN Xingle1 (1. 西南科技大学 环境与资源学院,四川 绵阳 ; 2. 金川集团有限公司龙首矿,甘肃 金昌 )
TAN Baohui1 (1. 西南科技大学 环境与资源学院,四川 绵阳 ; 2. 金川集团有限公司龙首矿,甘肃 金昌 )
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Abstract:
      Caving method was adopted to mine for the east of horizontal line 8 of 1595m in a nickel mine, while filling method was adopted to mine for the west of horizontal line 8 at the level of 1610m and the whole level of 1474m. In the caving stope, the explosive amount of the first medium-deep hole draw-trough blasting in the stope was 2300kg, which was about 50 times of the explosive amount of the normal shallow hole blasting in the filling stope approach. The stability of filling stope was monitored and studied by means of borehole pressure monitoring, tunnel deformation convergence monitoring and blasting vibration monitoring. Analysis of monitoring data indicated that after the chute blasting in the stope with caving method, the pressure value of the borehole pressure gauge in the two adjacent filling stopeshad not changed significantly, nor had obvious deformation convergence occurred in the stope approach. The maximum blasting vibration velocity detected by blasting vibration monitor in filling stope was less than the monitoring value of shallow hole blasting in filling stope and the relevant safety allowable value. The monitoring results indicated that the medium-deep hole blasting presented no adverse effect on the stability of adjacent stopes. The research can provide basis for the evaluation of stope stability of this nickel mine and reference for similar mines.
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