Microseismic monitoring and stability analysis for the large-scale underground caverns at the Wudongde hydropower statio
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ORIGINAL PAPER
Microseismic monitoring and stability analysis for the large-scale underground caverns at the Wudongde hydropower station Biao Li 1 & Nuwen Xu 2 & Feng Dai 2 & Gongkai Gu 3 & Wei Ke 3 Received: 4 April 2018 / Accepted: 11 March 2020 # Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract To analyse the stability of rock mass subjected to excavation of the underground caverns at the Wudongde hydropower station, a highresolution microseismic (MS) monitoring system was applied. Based on the temporal evolution characteristics of MS events, the relationship between construction state and MS activity was established. Combining the spatial evolution characteristics of MS events with traditional monitoring, geological survey and field observation, several main damage regions were identified and the key factors causing rock mass damage were revealed. Furthermore, the evolution laws of MS source multi-parameters during the large deformation of rock mass were systemically analysed. Prior to the large deformation of rock mass, the MS source multi-parameters behaved differently, including an obvious increment of the number of MS events, a sharp increment of the energy index with a progressive increment of the apparent volume and a decreasing trend of the centre frequency. The present study reveals that the integrated analytical method incorporating MS monitoring, traditional monitoring, geological survey and field observation leads to a better understanding of the behaviour of surrounding rock mass subjected to excavation, which is of great significance for the risk management of rock mass deformation and failures in the large-scale underground caverns. Keywords Microseismic monitoring . Stability analysis . Underground powerhouse . Excavation . Wudongde hydropower station
Introduction A microseismic (MS) event is a microfracture of localised rock mass induced by engineering disturbance involving excavation, grouting, impoundment, etc. As is known, an MS event will emit detectable seismic waves. Through installing sensors in the engineering regions of interest, the seismic waveforms can be acquired for damage location of rock mass. On the basis of the damage characteristics, the stability of rock mass can thus be evaluated. Since the late 1980s, the modern high-precision MS monitoring technology has been developed as an efficient method to * Nuwen Xu [email protected] 1
School of Geoscience and Technology, Southwest Petroleum University, Chengdu 610500, Sichuan, People’s Republic of China
2
State Key Laboratory of Hydraulics and Mountain River Engineering, College of Water Resource and Hydropower, Sichuan University, Chengdu 610065, Sichuan, People’s Republic of China
3
China Three Gorges Projects Development Co., Ltd, Beijing 100038, People’s Republic of China
assess the engineering hazards in many fields within deep mines (Young et al. 2004; Lesniak and Isakow 2009; Hudyma and Potvin 2010; Trifu and Shumila 2010; Lu et al. 2015), underground oil and gas storage (Hong et al. 2006; Ma et a
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