Abstract: In order to study the influence of weak interlayer of different thickness a, position h and an- gle θ on the stability of surrounding rock of roadway under dynamic disturbance, numerical analysis of the mechanical response of roadway surrounding rock with weak interlayer under the action of stope blasting has been carried out using the finite element software ABAQUS, and the optimization support scheme has been put forward combing the practical conditions of roadway of Dongguashan Copper Mine. The results have shown that in conditions of dynamic disturbance：1) Both the stress and dis- placement have a non-linear relation with interlayer thickness a or position h upon the roof and two sides of roadway; the stability of the surrounding rock declines at first with the increase of a/h and then shows an up-going trend, which has indicated relative changes of the influence of a or h on secondary static stress of surrounding rock and dynamic disturbance attenuation. 2) With the increase of interlayer angle θ, the attenuation of the layer to dynamic wave rises up and then becomes more obvious when θ grows larger. 3) The weak interlayer as an important role on the stability of roadway surrounding rock of Dongguashan Copper Mine, support measures and technical parameters can effectively control the deformation of surrounding rock, which has verified above results.

Key words: dynamic disturbance, weak interlayer, mechanical response, support optimization, numerical simulation