Evaluation index of bursting liability of coal based on energy transfer efficiency
The accumulation and release of energy in coal are closely linked to rock burst,with energy transfer being a key parameter for evaluating bursting liability.This study constructs an energy transfer model under energy source disturbance conditions,where we establish a relationship between impact en-ergy index and elastic energy index,propose the proportion of energy φ,introduce the concept of energy transfer efficiency β based on an energy dissipation model during the transfer process,develop an evalu-ation method for bursting liability by multiplying two efficiency parameters η=βφ.We conducted experi-ments to identify bursting liability of 11 coal layers from 3 pairs of coal mines,whose reliability was ver-ified by referencing results from 79 layered impact tendency identifications in other coal mines.Results show that 1)the proportion of energy release φ has boundary conditions with physical significance for ground pressure;2)there is negative correlation between the efficiency β and Poisson's ratio which can model boundary conditions;3)calculation results of the energy transfer index η show high consistency(88.61%)with bursting liability identification results,reflecting the bursting liability of coal bodies.It can serve as a basis for evaluating"∗"outcomes and is an effective indicator suitable for existing sys-tems used to evaluate bursting liability.
identification of bursting liabilityenergy release ratioenergy transfer efficiencyenergy transfer indexrock burst
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