巴鲁巴铜矿中央运输巷道变形机理及支护优化研究
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摘要
中色卢安夏巴鲁巴矿580 m水平中央有轨运输巷道在矿山复产初始围岩夸冒严重,第一次返修使用钢拱架对巷道进行了支护,但无法阻止巷道的不断变形。对巷道变形的机理进行研究,认为巷道围岩存在应力集中现象,并且穿过稳定性较差的矿岩接触带,围岩承载能力低,而支护强度不足,围岩中存在易水化、易膨胀的岩石及裂隙充填物,这些因素促使巷道发生变形。结合巷道变形的原因以及现场实际情况,确定使用"钢拱架+预应力注浆锚索"的联合支护方式,对巷道进行二次修复,使巷道变形得到控制。实践结果表明,采用联合支护后,巷道变形得到有效控制。研究成果为类似条件下巷道围岩治理提供很好的借鉴和参考依据。
The 580 m central tramming haulage of CNMC Luanshya copper mine was seriously collapsed before the first time repairing that used the arch set for supporting,but it still can't stop the deformation. After study on the deformation mechanism,we realized that there had been some problem of stress concentration in the rock,some area like the transition area was not steady. The rock in this area is very weak,also there had been some rock which was easily hydrated and expanded under the effect of water,and the support was in poor condition. These were the reasons leading to the deformation. After analyzing and thinking about the condition,we considered that the tunnel should be repaired immediately,the combined support should be used in order to stopping the deformation as soon as possible. The practical result shows that deformations of haulageways surrounding rocks were effectively controlled after combined supporting. The study results can be used as reference for haulageways surrounding rocks management under similar conditions.
The 580 m central tramming haulage of CNMC Luanshya copper mine was seriously collapsed before the first time repairing that used the arch set for supporting,but it still can't stop the deformation. After study on the deformation mechanism,we realized that there had been some problem of stress concentration in the rock,some area like the transition area was not steady. The rock in this area is very weak,also there had been some rock which was easily hydrated and expanded under the effect of water,and the support was in poor condition. These were the reasons leading to the deformation. After analyzing and thinking about the condition,we considered that the tunnel should be repaired immediately,the combined support should be used in order to stopping the deformation as soon as possible. The practical result shows that deformations of haulageways surrounding rocks were effectively controlled after combined supporting. The study results can be used as reference for haulageways surrounding rocks management under similar conditions.
引文
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[2]Malan D F,Spottiswoode S M.Time-dependent fracture zone behavior and seismicity surrounding deep level stopping operatins[C]//Rockburst and Seismicity in Mines.Rotterdam:A A Balkema,1997:173-177.
[3]姚裕春.高水应力软岩巷道围岩变形机理及支护对策[D].西安:西安科技学院,2002.
[4]康红普,陆士良.巷道底鼓机理的分析[J].岩石力学与工程学报,1991,10(4):362-373.
[5]姜耀东,赵毅鑫,刘文岗,等.深部开采中巷道底鼓问题的研究[J].岩石力学与工程学报,2004,23(14):2396-2401.
[6]康红普.巷道围岩的承载圈分析[J].岩土力学,1996,17(4):84-89.
[7]黄超慧.深部高应力膨胀性软岩巷道喷锚注支护研究[D].西安:西安科技大学,2006.
[8]丁秀丽,盛谦,韩军,等.预应力锚索锚固机理的数值模拟试验研究[J].岩石力学与工程学报,2002,21(7):980-988.