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大断面软岩斜井支护支架选型优化研究

Study on optimization of support selection for mine large cross section soft rock inclined shaft

  • 摘要: 鉴于哈密南湖一矿斜井埋深浅、地应力小,岩性软弱等特点导致支护困难的问题,提出采用金属支架和混凝土砌碹的联合支护方式。为提高斜井断面利用率,降低支护成本,采用实验室试验的方法测试了工字钢拱形支架的承载力,进行了金属支架优选,试验结果表明16号工字钢支架承载能力较强,连接部位未出现破坏。现场应用结果表明:主斜井最大变形量为31.6 mm,副斜井最大为11.4mm,16号工字钢拱形支架能够满足支护要求,且比同强度的U型钢支架成本缩减3/4,技术及经济效益显著。

     

    Abstract: In view of support difficult question caused by the shallow depth, low stress, weaken lithology and other features of the mine inclined shaft in Nanhu No. 1 Mine of Hami, a combined support mode with metal support and concrete lining was provided. In order to improve the cross section utilization rate and to reduce the s upport cost, the optimized selection of the metal support was conducted. An indoor lab experiment method was applied to test the loading of the steel 1- beams support. The results showed that the steel 1- beams support would have a high loading capacity, the integration deformation occurred and there was no failure occurred at the Co nnection part. The underground mine support experiment showed that a max deformation value of the mine main inclined shaft was 31. 6 mm, a max deformation value of the mine auxiliary inclined shaft was 11. 4 mm, both small deformation could meet the safety and operation requirements. The lab and underground experiment result s showed that No.16 steel 1- beams support could meet support requirements and the cost of U type steel powered support could be reduced by 3 14 in comparison wit h the same strength. The technical and economic benefits were obvious.

     

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