Mechanism of Vibration Energy Action on Dynamic Instability of Shock-Type Rockburst Carrier System

Abstract

In coal mining, the rockburst intensity triggered by the mine earthquake is often greater in the mining area, and the precursor information is more difficult to capture. In this paper, this kind of rockburst is called shock-type rockburst and studied as the research object. Based on the evolution process and the theoretical model of the carrier system, the energy criterion of the occurrence of shock-type rockburst was deduced based on the theories of mathematics and statistical physics. The results showed that the process of shock-type rockburst can go through four stages: inoculation stage, occurrence stage, development stage, and termination stage, and the secondary triggering phenomenon may occur in the occurrence stage. The theoretical model of the shock-type rockburst carrier system was constructed, and the key characteristic parameter of shock-type rockburst was put forward. Then, the energy of mine earthquake was quantitatively characterized in the form of kinetic energy of rock block. Through the combination of the two parameters, the energy criterion of shock-type rockburst was obtained as follows: once the energy of mine earthquake acting on the rockburst source area was 2%–9% of the static energy, shock-type rockburst can occur. Then, this criterion was verified by three typical cases. Finally, based on the distribution conditions of “red seam” overburden in the Yanzhou mining area of China, the secondary triggering principle of rockburst was expounded, that is, the secondary triggering principle of rockburst caused by the shear fracture and sliding settlement of “red seam” overburden. To sum up, a theoretical system for judging the instability of the shock-type rockburst carrier system was formed. This study provides a theoretical basis for earthquake prevention and disaster reduction in coal mining.

Mining Stress Distribution in Stope and Overlying Rock Fracture Characteristics and Its Disaster-Pregnant Mechanism of Coal Mine Earthquake

“…Te complex and changeable engineering efect was caused by mining in stope. Te mechanical balance system consisting of the coal seam, roof, and foor are always changing when the working face is advancing [14,15]. Such as the advance support pressure, lateral pressure, and height of overlying rock of three zones were changed when the working face mining.…”

Unified Mechanism of Rock Burst Induced by Coal Mine Earthquake and Its Activity and Response Characteristics

“…It mainly studied about the hard roof type coal mine earthquake in references [22][23][24][25][26][27][28][29]. Te large overburden area easily produced a strong dynamic load and induced rock burst after breaking hard roof in references [22,23].…”

“…It mainly studied about the hard roof type coal mine earthquake in references [22][23][24][25][26][27][28][29]. Te large overburden area easily produced a strong dynamic load and induced rock burst after breaking hard roof in references [22,23]. Te occurrence mechanism of rock burst under the control of thick conglomerate and thrust fault was analyzed in references [24,25].…”