Application of the Loose Circle Theory of Surrounding Rock in the Optimization of Roadway Support in One Iron Mine
The deep roadway deformation of an iron mine in Yunnan Province is serious,and the roadway fails to achieve the ideal support effect after repeated support,which brings hidden dangers to mine safety production.In order to optimize the effect of roadway support and determine reasonable support parameters,the current situation of roadway support was calculated and analyzed based on the loose zone theory of surrounding rock.Orthogonal tests were designed to select three factors that had a greater impact on the support,and numerical simulation was carried out by FLAC3D software.The results show that the cause of roadway deformation and failure is the mismatch between the grade of surrounding rock loose ring and supporting parame-ters.Among the three factors,the length of bolt,the spacing between bolts and the thickness of shotcrete layer,the thickness of shotcrete layer has the greatest influence on the supporting effect.In a certain range of scientific values,the larger the thickness of the concrete shotcrete layer,the smaller the length of the bolt,the larger the row distance between the bolt,the smaller the displacement of the roadway roof and two sides,the better the support effect.Finally,the optimal parameters of 1.8 m long bolt,1.0 m×1.0 m distance between bolt rows and 100 mm thickness of shotcrete are proposed to support roadway with anchor net shotcrete.
roadway supportingloose circle theory of surrounding rocknumerical simulationorthogonal experiment
万方数据
维普
