2010•Journal of China University of Mining and TechnologyRequires access
Research on the Influence of Roof Strata on Rock Burst Risk
Mingwei Zhang
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Abstract
The influence of the roof stratum on the stress state of a coal mass was studied by simulation methods.The attenuation of seismic waves through the rock mass,and the damage from the action of seismic energy on the coal mass,was treated by considering the energy of the waves.The danger of rock burst was analyzed by considering roof strata of different thicknesses and strengths.The energy released during roof rupture is logarithmically related to the roof stratum strength and exponentially related to its thickness.A harder and thicker roof stratum generates higher dynamic stresses on the coal mass and increases the danger of rock burst.Strata of a particular thickness and strength located near the coal seam often have greater influence on rock burst.Control practices at the working face of one coal mine suggested pre-splitting the roof strata above the coal seam by blasting can reduce the danger of rock burst.