QUANTITATIVE DESIGN METHOD FOR ROCKBURST ENERGY ABSORPTION PREVENTION AND CONTROL

摘要

The present invention relates to the technical field of underground engineering rockburst prevention and control safety. Provided is a quantitative design method for rockburst energy absorption prevention and control. The method comprises: firstly, establishing an underground-engineering finite-element numerical calculation model, and performing underground-engineering excavation simulation calculation; delineating the location and range of rockburst damage and a rockburst pit depth according to an LERR value, and providing the amount of released energy at different positions during a rockburst; then, determining the location, trend and inclination angle of a structural plane; and then, determining the design length of a free section of each energy absorption anchor bolt, and determining an optimal length of each single energy absorption anchor bolt in combination with a design anchoring force of the anchor bo then, calculating ejection kinetic energy of rockburst rocks; and finally, determining the length of an anchoring section of each energy absorption anchor bolt, the total length of each anchor bolt, and the number of anchor bolts, such that the total energy absorption capacity of all the energy absorption anchor bolts is greater than the ejection kinetic energy when a rockburst occurs. The method provides a quantitative design method and process for energy absorption anchor bolts, and provides a design basis for scientific design of rockburst energy absorption prevention and control.