The stability of roadway surrounding rock is the fundamental guarantee for safe mining.This paper takes the deep roadway of a mine in Yunnan as the research object,and studies the timing and parameter optimization of secondary support in combined support.The research on support method and failure mode shows that the surrounding rock of roadway shows obvious rheological phenomenon un-der the action of high ground stress in deep mining.Combined with the creep test of surrounding rock,the variation law of radial dis-placement of roadway is analyzed,and the timing of secondary support is determined.By analyzing the influence of shotcrete thickness,bolt length,bolt row spacing and bolt diameter on the supporting effect,the numerical simulation and orthogonal test methods are used to optimize the supporting parameters from four aspects:roof subsidence,floor heave displacement,two-side displacement,and plastic zone.The proposed secondary support timing and combined parameters can provide reference for roadway support in similar strata.
high stress roadwaysecondary supportcreep testorthogonal test
万方数据
维普
