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