Abstract:
The formation process of rock burst is extremely complex,and the essence is the accumulation and violent release of elastic energy. Clarifying the objective elements and intervention mechanisms that influence the energy evolution process will provide basic knowledge to guide practical prevention and control efforts. In this paper,a numerical model of coal sample with real distribution characteristics was reconstructed by CT scanning. Based on the fact that the mechanical behavior is closely related to the loading environment,a multi-loading rate simulation test was carried out. The research shows that when the stress environment changes,the impurity inclusion with higher strength has more significant attraction to the response of yield and stress concentration compared with the coal matrix with smaller strength,and the late yielding element gradually forms a spatial skeleton with load-bearing capacity while accumulating elastic deformation energy. It is pointed out that the spatial distribution pattern of impurities,load-bearing skeleton or other structural elements that can destroy the medium uniformity and has a potential control effect on the energy or stress distribution. The multi-loading rate mechanical test based on the sample with artificial structure verified the conclusion,and proposes that the selective control of macro mechanical behavior of medium can be realized by purposeful artificial formation of specific structure mode,which provides a clear research direction for quantitative prevention and control of rock burst.