Optimization of bolt support parameters for drainage roadway of high-altitude broken surrounding rock
Reasonable support form and support parameters are the key to ensuring the stability of the roadway surrounding rock.The joint support effect of bolt+metal mesh+shot grouting in the GradeⅣsurrounding rock area of the drainage roadway of Julong Copper Mine in Xizang is poor.In this paper,for the problems of support in the Grade Ⅳ surrounding rock area of the drainage roadway of Julong Copper Mine,bolt and steel arch support,as well as the thickness of shot grouting,is introduced on the basis of the existing support.Different bolt support parameters are designed and optimized using finite element numerical simulation software.The results show that there is an obvious stress addition phenomenon at the roadway surrounding rock roof.With the increase of bolt support parameters,the maximum stress value at the roadway roof increases.With the increase of row spacing between bolts,the maximum dis-placement of the roadway roof increases,the bolt spacing increases from 1.2 m to 2.0 m,and the displacement of the roadway roof is 4 mm,4.38 mm,and 4.82 mm,respectively.The optimal support parameter of the bolts is 1.6 m×2.4 m.The results of the study provide theoretical references for the selection of the support parameters of the bolts of similar roadways.
high altituderoadway supportbroken surrounding rockbolt supportnumerical simulation
万方数据
维普
