Latest progress on study of stability control of roadway surrounding rocks subjected to rock burst

摘要

Rock burst has caused tremendous hazards in coal mining. Usually, it can cause roof falling suddenly, sometimes even closing and jamming abruptly; so it has become one of the three most difficult problems of deep mining in the world. The authors discussed the present study in this field at home and abroad and introduced the latest progress. Main results including: 1) According to the mechanism of roadway destroyed by rock burst, we established a strong-soft-strong structural model of preventing rock burst and analyzed its engineering application; 2) Using TDS-6 seismic experimental instrument, we performed experiments on the transmitting law of shock wave in/on four typical media rock-soils. Shock energy attenuates exponentially with the distance from the explosive center, whose formula is E=E0l-η and is different from E=E0e-ηl which can be consulted in literatures; 3) The destruction process of roadway subjected to rock burst was simulated with FLAC2D software, indicating that the roof strata quickly yields to tension and compression, making the high stress area surrounding the ribs a "double-ear-shaped" pattern. It is this continuous and repeated action of this "double-ear-shaped" high stress that destroy roadway gradually. The future study was suggested at the end of this paper.