Preliminary study on rockburst development law and rockburst prediction in excavation of layer I of underground powerhouse system in high geostress area of Shuangjiangkou hydropower station
MA Xingdong,LI Changyou,WANG Xiuhua,YUAN Guoqing,MA Hong
Abstract:The measured maximum principal stress on the left bank of Shuangjiangkou Hydropower Station is 37.82 MPa,NNW direction,which is the highest measured ground stress of the underground powerhouse system of the domestic hydropower station under construction and under construction,belonging to the high to extremely high stress area. The excavation reveals that the rockburst phenomenon of the left bank cavern group is extremely common and prominent,which is mainly manifested in the prominent rockburst phenomenon of the first layer excavation,the continuous development of the whole section,the large development area,“V”type blasting pit is obvious,the shallow surface 0.2-0.5 m thin-layer circular section is stripped,the rockburst phenomenon is prominent at the initial stage of excavation,with a certain lag effect and a long duration,with typical time and space effect. The statistical law shows that the failure type of rockburst is mainly stress rockburst,with structural rockburst locally developed;the rockburst level of the first layer is slight to medium;the time of rockburst support is suitable for 2 to 3 days. According to the law of rockburst development in the first layer,the preliminary study on rockburst prediction is carried out,such as rockburst failure type,rockburst grade,rockburst time-space characteristics,rockburst failure phenomenon,etc.,in order to summarize the experience of rockburst prediction through the comparison of underground excavation,and provide some reference for other engineering rockburst prediction.
马行东,黎昌有,王修华,袁国庆,马 宏. 双江口电站高地应力区地下厂房系统第I层开挖岩爆发育规律和岩爆预测初步研究[J]. 岩石力学与工程学报, 2020, 39(S1): 2964-2972.
MA Xingdong,LI Changyou,WANG Xiuhua,YUAN Guoqing,MA Hong. Preliminary study on rockburst development law and rockburst prediction in excavation of layer I of underground powerhouse system in high geostress area of Shuangjiangkou hydropower station. , 2020, 39(S1): 2964-2972.
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