Study on the Parameters of Roadside Support after the Cantilever Beam of the Basic Roof with Height of Fracture Zone Cut by Deep-Hole Blasting

Abstract

In order to determine the reasonable parameters of roadside support, based on the analysis of the law of surrounding rock activity in gob-side retaining roadway, it is proposed that the relationship between different parameters of roadside support wall and its supporting resistance is calculated and analyzed by using the improved mechanical model after deep-hole blasting roof cutting and improving the external mechanical environment of surrounding rock then. The mechanical equation for calculating the width and strength of supporting wall near roadway is derived. The analytical solution of width and strength value of roadside support under roof cutting condition is obtained, and field application is carried out in 3207 working face of Nanyang Coal Mine. The results show that it is feasible to set the height of the upper-side fissure zone of the goaf beside the roadway as the height of the cutting roof; it is reasonable to calculate the height of the cut roof as the height of the static block; the formula of the width with a certain strength of the roadway support wall obtained in this paper and the redundant safety factor of the parameters of the roadway support wall tried to be adopted are effective. Finally, after improving the external mechanical environment of retained roadway surrounding rock, reasonable parameters of roadside support are the guarantee to ensure the stability and integrity of retained roadway structure along goaf.