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

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.