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Characteristics of dynamic disturbance response in deep coal and rock and its numerical analysis

2013; Elsevier BV; Linguagem: Inglês

2212-4578

Shen Rong-xi,

Geoscience and Mining Technology

The stress wave propagation law caused by dynamic disturbance is analyzed in coal rock.Additional energy domain is also explored.The disturbance frequency and amplitude response characteristics and energy distribution law of coal or rock system is studied.The results show that the disturbance amplitude and frequency greatly affect the stability indeep surrounding rock.Additional energy flow density is proportional to the square of dynamic disturbance amplitude,and the disturbance also caused surrounding rock stress abutement zone forward.Distance from the maximum reflection energy flow density peak position to the free surface and perturbation frequency conforms to a power function relation.The increase of disturbance frequency accelerates the energy flow rate and reduces the inflow of energy into coal rock in unit time.This process can be expressed as frequency with lower energy and lower frequency with higher energy.Disturbance is coupled with unbalanced development of energy flow and which promotes each other.