Dynamic response of surrounding rock with high stress in deep chamber

During the deep chamber is excavated,stress wave plays a very important role effecting the chamber surrounding rock in the regularities of displacements and stress-strain.Accurate analysis of it is important in deciding the construction sequence for big cavern and instability.By using the fast Lagrangian analysis of continua in 3-dimensions(finite element analysis software-Flac3D),taking the fragmentation chamber of Dongguashan copper mine as an example,one dynamic load is applied on the above boundary of the chamber model,the dynamic response of the surrounding rock is simulated and calculated.We observed the influence of the intensity of dynamic load to wall rock of chamber to get the distribution of stress and plastic area of it in different time by loading the peak value of dynamic.The simulation study results shows: it affects the stability of the chamber vault and wall rock of bottom board much when perturbation strain wave comes from erect direction of chamber wall rock;and it affect the stability of wall rock of chamber parietal much when perturbation strain wave comes from horizontal direction of wall rock of chamber.