Numerical Analysis of Theory of Pre-Stress Synergetic Support in Deep Mine Roadway

In order to improve the actuality that the stability of surrounding rocks in deep roadway is difficult to control,we put forward the idea of bolt and cable's pre-stressing synergetic support.Using numerical simulation,we calculated and analyzed the deep roadway supported based on this idea.The results show that,under the current support condition,high-strength bolts must be used with a pre-stressing force greater than 40 kN to cooperate with cables with more than100 kN pre-stressing force.When the pre-stressing force of bolt and cable have a synergistic function,the deep roadway will have an apparent support effect,for example,the stress concentration area surrounding the roadway decreases significantly,and the stress distribution tends to be more uniform.The average utilization rate between bolt and cable has only a little difference and both of them are greater than 0.5,making the mechanical properties of bolts and cables give fully play,avoiding the bolts and cables working separately.So we suggest that the idea of pre-stressing synergetic support can be used as a theoretical foundation for the roadway support design.