Effect of advance speed on rock burst in coal mines and its dynamic control method

This paper investigates the effect of advancing speed of working face on the rockbursts in working faces by means of case studies and microseismic monitoring data analysis. Its mechanism is then revealed based on the identifi- cation of relationships between rockburst and advancing mode or speed. A dynamic control method for the advancing speed effect is presented through analyzing the microseismic characteristics of similar working faces. The results show that the rockburst hazard of working faces is associated with the advancing mode or speed. Two advancing modes,high speed and inconstant speed,tend to induce rockbursts in working faces. Advancing at a high speed can lead to the transformation of potential energy in roof strata and the release of strain energy in coal seams. Advancing at an incon- stant speed can lead to the localized release of strain energy in coal seams. A dynamic method for controlling advancing speed effect is presented based on microseismic response characteristics,and its successful applications in a number of coal mines demonstrate that it can provide a guideline for the active prevention and control of rockburst hazards in deep mining.