关键词: 岩爆, 卸压孔, 劈裂, 双轴压缩试验, 声发射

Abstract: To solve the partial danger release of rock burst, a partial risk reduction method that creates cracks in the foundation of the pressure relief hole was proposed. A double-axis compression test of the specimen with the tendency of rock burst was carried out in combination with strain gauge and acoustic emission(AE) monitoring techniques. The results show that compared with the simple pressure relief hole, the control of the process of local de-danger evolution of surrounding rock containing 0° and 45° split cracks is changed from two sides of decompression holes to the end of the split fracture, which expands the decompression area, and the decompression hole work together with the split cracks. The nonlinear characteristics of the relation curve between the stress and vertical strain before the peak are enhanced. The energy dissipation prior to the peak is enhanced, but the integrity of the surrounding rock is reduced to a greater extent, which means the effect of decompression is obvious. The process of local de-danger evolution of surrounding rock containing 90° split cracks is still controlled by the two sides of decompression holes. The local de-danger effect of 0° split crack is demonstrated as the best one with the pre-peak energy release of 85.70%, followed by those with 45° and 90° split cracks. The results provide valuable guidance and reference for rock burst prevention and control.

Key words: rock burst, pressure relief hole, split, biaxial compression test, acoustic emission