152 / 2023-07-01 16:25:12

Energy characteristics and on-site prevention and control of coal rock burst failure induced by dynamic load disturbance in deep roadway.

dynamic load disturbance, deep roadway, energy, plastic zone, microseism, rock burst

The surrounding rock of deep roadway is in the state of limit stress equilibrium, under the environment of high vertical stress and strong tectonic stress, the dynamic load disturbance is prone to impact damage, which seriously hinders the safe and efficient production of the mine. Aiming at the problem of frequent rock burst in the main roadway of Gaojiapu Coal Mine, based on the analysis of the energy characteristics of microseismic monitoring of coal-rock burst failure in deep roadway, the evolution characteristics of different types of energy when coal-rock burst failure occurs in deep roadway under dynamic load disturbance are studied by means of theoretical analysis, numerical simulation and engineering practice, and the energy criterion of burst failure of surrounding rock in deep roadway is formed. The field microseismic monitoring results show that: when there is no impact danger in the roadway, the total energy of the microseismic day continues to remain at an energy level of less than 10³ J, which is in a state of stable energy release; Weak impact danger, the total energy of microseismic day is 10⁴ J; in the case of medium impact risk, the total energy of a microseismic day during one month is 10⁵ J; strong impact danger, the total energy of two or more microseismic days is 10⁵ J during a month, and the energy fluctuates greatly. The results of numerical simulation show that: at the initial stage of dynamic load disturbance, the plastic zone of roadway surrounding rock roof expands rapidly; in the middle and late stages of dynamic load disturbance, the plastic zone of roadway surrounding rock gradually develops to the floor, which will cause floor heave under the influence of bottom coal. The expansion of the plastic zone consumes the shape change energy stored in the coal and rock mass, if the dynamic failure occurs in the coal and rock mass, the volumetric strain energy stored in the coal and rock mass will be converted into kinetic energy, forming the roadway rock burst. Based on the results of numerical simulation and theoretical analysis, the optimum angle of large diameter drilling construction in a panel roadway is put forward.