Research on energy model of rock burst under strain in deep roadway and energy supply law of near-field surrounding rock

Abstract

The accumulation and sudden release of elastic energy of near-field surrounding rock is the essence of strain-type rock burst in deep roadway. In order to further understand the mechanism of near-field surrounding rock energy on rock burst disasters, a strain-type rock burst model was established, the energy process of strain-type rock burst was proposed, and the energy supply law of strain-type rock burst energy source to burst rock under different factors was revealed by combining theoretical analysis and numerical simulation. The results show that: in the strain-type rock burst, the ratio of energy supply to total energy of near-field surrounding rock system is negatively correlated with the stiffness ratio of energy supply to burst rock; the higher the elastic modulus of the roof and floor is, the higher ratio of the deep coal is, and the lower ratio of the roof and flooris. The larger depth of the burst rock is, the lower the energy supply ratio of the corresponding deep coal is, and the higher the energy supply ratio of the roof and floor is; under the condition of hard roof and floor strata, the prevention and control of strain-type rock burst is to reduce the energy storage of deep coal and reduce the energy supply of deep coal. Under the condition of soft roof and floor strata, the prevention and control of strain-type rock burst should strengthen roof support and floor pressure relief to reduce the energy supply of roof and floor; the roof and floor are the main energy supply sources for the strong-strain-type rock burst, and the energy of the deep coal plays a scouring effect on the weak-strain-type rock burst.

Keywords

• strain-type rock burst
• energy source
• burst rock
• elastic modulus
• burst depth