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| Deformation warning of surrounding rock based on fractal dimension of microseismic energy |
| MAO Haoyu1, XU Nuwen1*, SUN Yuepeng1, ZHOU Xiang1,2, DING Xinchao3, DONG Linlu1
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1. State Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan University, Chengdu 610065, Sichuan, China;
2. Guodian Dadu River Jinchuan Hydropower Construction Co., Ltd., Aba 624100, Sichuan, China;
3. PowerChina Northwest Engineering Corporation Limited, Xi'an 710065, Shaanxi, China |
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Abstract Based on the spillway tunnel project of Jinchuan Hydropower Station, this research introduced the microseismic monitoring technology to monitor the deformation and failure of surrounding rock in real time, and studied the spatio-temporal evolution characteristics of microseismic events in surrounding rock of spillway tunnel. The failure mechanism of surrounding rock in spillway tunnel of Jinchuan Hydropower Station was analyzed by means of energy ratio of transverse and longitudinal waves ES/EP. The fractal rock mechanics theory was introduced into the field of microseismic, and the spatiotemporal evolution of the fractal dimension of energy released by microseismic was analyzed. The relationship between the fractal dimension and the deformation of surrounding rock in time and space was revealed through the comparative analysis of the evolution law of the fractal dimension and conventional monitoring data. The fractal dimension of the microseismic energy of rock mass before the deformation occured would appear dimension reduction in time and space, which could be used as a warning signal.
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Received: 18 July 2023
Published: 19 December 2023
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