Differences of Mechanical Parameters and Rockburst Tendency Indices between Coal and Non-Coal Rocks and Modified Rockburst Tendency Classification Criteria for Non-Coal Rocks

Rockbursts represent hazardous dynamic disasters for underground coal mines and other rock engineering projects. Some bursting liability indices are put forward applied to identify the likelihood of burst occurrence. The classification criteria proved be reasonable coals, but they still immature non-coal rocks. Thus, it is uncertain that use evaluating Hence, in this study, a large amount data, such as basic mechanical parameters, i.e., Poisson’s ratio μ, elastic modulus E, uniaxial compressive strength σc, tensile σt, indices, strain energy index WET, Wcf, fracture duration time DT, brittleness B, different coals rocks were collected China. Then, differences parameters rockburst tendency between studied systematically, apart from three have great data distribution concentration scope, which cannot share same system coals. In addition, evaluation results single directly compared pairs, inconsistency rate about 42–68%. It necessary build comprehensive method evaluate At last, modified forward. WET Wcf classify rocks, while unreasonable DT σc. has been concluded B more suitable new index, named decrease (SDR), was proposed determine liability, σc DT.