Study on spatial characteristics of rockburst in underground powerhouse of Shuangjiangkou Hydropower Station in ultra-high stress area
MA Xingdong1，LI Peng2，GUO Songfeng3，XU Dingping4，LI Changyou1
(1. PowerChinaChengdu Engineering Corporation Limited，Chengdu，Sichuan 610072，China；2. GuodianDadu River Basin Hydropower Development Co.，Ltd.，Chengdu，Sichuan 610041，China；3. Institute of Geology and Geophysics，
Chinese Academy of Sciences，Beijing 100029，China；4. Institute of Rock and Soil Mecanics，
Chinese Academy of Sciences，Wuhan，Hubei 430071，China)
Abstract：The measured ground stress on the left bank of Shuangjiangkou Hydropower Station reached 37.82MPa. From the analysis of the spatial distribution law of ground stress and the spatial stress test results of rock mass in the technical construction stage，the ground stress has certain regional differences. From the macro qualitative analysis of the magnitude of ground stress in the cavern layout area and the angle between the tunnel axis and the direction of ground stress，the rock burst of the main and auxiliary power houses is the strongest and the destruction phenomenon is the most serious，and the rock burst damage on the upstream side is greater than that on the downstream side，Numerical simulation and quantitative analysis also get the same conclusion. After excavation，based on a large number of on-site investigations and statistics on the development of rock burst，the spatial characteristics of rock burst were analyzed，and the macro spatial development law of rock burst was summarized. Among the three caverns，the rock burst in the main and auxiliary power houses was the most serious，followed by the tail dispatching room，and the main transformer room was the weakest. The damage degree of rock burst in the main power house was greater in the pilot tunnel，the spandrels and side walls on the upstream side of the first and second layers than that on the downstream side，while the third layer The rock anchor beam and side wall at the downstream side of the fourth layer are larger than those at the upstream side，and the macro investigation law is consistent with the previous results. Combined with the spatial distribution law of microseismic monitoring events，it is found that Shuangjiangkou Hydropower Station has typical spatial characteristics of rockburst. By summarizing these characteristics，the characteristics of small-scale regional rockburst can be preliminarily estimated，which has certain guiding significance for the refinement of ground stress and support of water diversion system in the future.
马行东1，李 鹏2，郭松峰3，徐鼎平4，黎昌有1. 双江口电站超高应力区地下厂房岩爆空间特性规律研究[J]. 岩石力学与工程学报, 2023, 42(S1): 3141-3150.
MA Xingdong1，LI Peng2，GUO Songfeng3，XU Dingping4，LI Changyou1. Study on spatial characteristics of rockburst in underground powerhouse of Shuangjiangkou Hydropower Station in ultra-high stress area. , 2023, 42(S1): 3141-3150.
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2023, Vol. 42 
