Abstract:
In order to discuss mechanism of roadway rock burst induced by dynamic load in the control area of high ground stress, based on theory of elastic mechanics, the mechanics model of deep dynamic roadway, the mechanical criterion of roadway rock burst was derived. And, stress and elastic energy evolution laws of dynamic roadway surrounding rock were analyzed by using FLAC simulation software. Results show that rock burst of buried deep roadway is affected by multiple factors. The deeper roadway is, the greater ground stress is, and the distance between source and free surface of roadway is close, and surrounding rock is easily impacted. With increase of lateral pressure coefficient, the stress of dynamic roadway surrounding rock changes obviously. The vertical stress of the roadway is significantly larger than that of roof. The elastic energy value reaches the maximum in the 4 m horizontal position of roadway. However, the maximum residual elastic strain energy of roadway is closed to surface, and surrounding rock is in the limit equilibrium state. The crack of surrounding rock is further expanded under action of dynamic loading, and the accumulation of high elastic energy can be released, thus, rock burst of roadway is induced.