Abstract: Destruction of roadway surrounding rock is a key area of reinforcement, the plastic zone surrounding rocks of circular deep roadway was researched in the different side pressure coefficient（λ）by elastic-plastic theory, and the influence of plastic zone distribution of surrounding rock was analyzed. The results show that: λ=1, plastic zone of roadway surrounding rock was circular. λ≠1, plastic zone of roadway surrounding rock was ellipse. The plastic zone was related to the external load and side pressure coefficient and rock cohesion and internal friction angle. λ>1, roadway support should be to control the roof and floor mainly. λ<1, roadway support should be to control the side wall mainly. Based on the distribution of plastic zone surrounding rocks, the length of bolt and cable were designed, by the industrial experiment, shows that bolt support technology can guarantee the stability of deep roadway by control deep plastic zone in surrounding rock of the roadway.

Key words: Side pressure coefficient, Elastic-plastic theory, Plastic zone distribution, Bolt support