ROCKBURST PREDICTION IN PUBUGOU HYDROPOWER STATION

In southwest China, many Hydropower Stations in construction are located in high geostress regions. Rockburst has taken place in the underground powerhouse of the Ertan, Pubugou, and Jinping Hydropower Stations. Research on rockburst prediction in the Pubugou Hydropower Station has been studied as the following procedure. Initially, according to the Barton Stress criterion and the initial stress, the rockburst possibility is assessed as the slight-moderate level. Next, granite rock samples are obtained from the underground powerhouse, and Elastic Deformation Energy Index Wet is tested. Herein, rockburst possibility is also evaluated as the slight-moderate level. Lastly, the disturbed stress distribution during excavation is calculated through 3D numerical simulations. The results show that the slight-moderate rockbursts tends to occur in some places of the main cavern, and intensive rockbursts trend to happen in few places. These research results are in accordance with the field observations.