Abstract: 〖WT〗
In order to investigate the rock burst failure characteristics of the deeply buried caverns under the rock mass with various rock stresses, a series model tests were conducted by using an inhouse developed rock burst model test device. The macroscopic failure phenomenon of the rock burst and the strain of surrounding rock were evaluated. In addition to the model tests, the influence of different lateral pressure coefficients on the rock burst failure mechanism and the failure zone of rock mass were numerically simulated and analyzed. The results show that the deformation pattern of the surrounding rock of the cavern is basically symmetrical, when the lateral pressure coefficient λ is 1/3, the both walls of cavern are the main areas where the rock burst failure occurs, and the failure range is about 20% of the cavern diameter. The macroscopic failure zone ranges of the model tests were generally consistent with the numerical analysis obtained failure zones and the influence ranges. With the change of the lateral pressure coefficient λ, the rock burst failure area of the deeply buried cavern also changed and the critical load when the rock burst breaks increased with the increase of λ; when λ=1/3 and λ=1/2, the failure area was mainly concentrated on the both sidewalls of the cavern; when λ=1, the failure area was concentrated on the crest of the cavern, and extends from the crest to the toe of the side walls of the rock cavern. The paper concluded that it is feasible to study the mechanism of rock burst failure under different stress states by the combination of the model tests and numerical analyses.

Key words: Tunnel Engineering, Rock Burst, Underground Cavern, Lateral Pressure Coefficient, Model Test, Numerical analysis