Microseismic Monitoring of Open Pit Slopes

Lynch, Richard; Wuite, R; Smith, Brackin A.; Cichowicz, Artur

doi:10.36487/acg_repo/574_65

Cited by 18 publications

(6 citation statements)

References 1 publication

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“…In the time window considered, 1,161 events were totally located ( Figure 5). Of those, approximately 5% were recorded below the lowest part of the current pit (880RL) and they were most likely the result of stress changes related to the removal of broken rock after blasting and excavation (Lynch et al 2005). The analysis of the microseismic data revealed a strong relationship between the temporal and spatial style of activity for different areas of the slope, in the response to the triggering input (rainfall events), (Salvoni & Dight 2016).…”

Section: Group Amentioning

confidence: 99%

“…The installation and use of a microseismic monitoring system in open pit mines for slope monitoring is not a common practice. Several previous studies (Hudyma et al 2003;Lynch et al 2005;Wesseloo & Sweby 2008;Kagan et al 2013;Vinoth & Kumar 2014) discuss details of their seismic system, however, do not give much detail about the design of such a system from scratch. This section will focus on the design methodology for a microseismic system for open pit slope monitoring.…”

Section: Guideline For Microseismic Monitoring In Open Pit Minesmentioning

confidence: 99%

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Microseismic data — a comparison between routine trigger method and continuous data processing

Salvoni

Dight

2016

Proceedings of the First Asia Pacific Slope Stability in Mining Conference

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Over the years there have been several attempts to undertake routine real-time microseismic monitoring of open pit mine slopes. This technique has been commonly used in underground operations to manage induced seismicity and rockburst. However, the microseismic monitoring in open pits is still experimental and further studies are required. In this paper, we analysed the data from MMG Century mine where, in November 2013, a microseismic system was installed in order to monitor a large scale unstable slope. Design of the system and installation of the instruments were performed by the Institute of Mine Seismology. The seismic events were recorded, based both on a triggered scheme and in continuous mode. As part of our research project, data was given to four independent groups to be analysed and provide their own results. One group applied a routine method using the triggered data, manually processed them and made them available for the engineers on site within 10 minutes. The other three groups later reanalysed the data using both triggered and continuous waveform. Our work compared the different results obtained, and highlighted some of the key points engineers should be aware of in the design and implementation of a microseismic system in open pit mines.

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Section: Group Amentioning

confidence: 99%

Section: Guideline For Microseismic Monitoring In Open Pit Minesmentioning

confidence: 99%

Microseismic data — a comparison between routine trigger method and continuous data processing

Salvoni

Dight

2016

Proceedings of the First Asia Pacific Slope Stability in Mining Conference

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“…size, density, and concentration of the microfractures, the development trend of the macrofractures may be deduced and the potential risk of the dam can be forecasted [3]. In the past two decades, as a three-dimensional, realtime monitoring technique, the MS monitoring technique has been widely applied to assess engineering hazards that involve rock slopes [3][4][5], deep mining [6][7][8][9][10][11][12][13], tunnels [14][15][16], underground powerhouse caverns [17,18], oil and gas storage [19,20], and nuclear waste disposal [21,22]. For example, Xu et al [3] established a dynamic relationship between geological structures and the spatial distribution of MS events and assessed the stability of a high rock slope based on MS activities.…”

Section: Zeuzier Arch Dam In Switzerlandmentioning

confidence: 99%

Integrated Analysis of the Formation Mechanism of Cracks in a Concrete Dam Using Microseismic Monitoring and Numerical Simulation

Wang

et al. 2016

Journal of Sensors

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The dam of Guanyinyan hydropower station is composed of a concrete gravity dam in the left bank and a rockfill dam in the right bank. During the operation of the hydropower station, several surface cracks occurred in the concrete gravity dam, which threatened the stability of the dam. To evaluate the evolution trend of the cracks and forecast the potential risk of the dam, the microseismic (MS) monitoring technique and finite-element method were used. First, the concrete three-point bending field test was performed to prove the reliability of the MS technique in monitoring the concrete cracks. The MS monitoring results were consistent with the simulation results. Then, the MS monitoring system was installed in the dam body. By analysing the MS activities before and after the impoundment, the evolution trend of the cracks and potential risk of the dam were evaluated and forecasted. The simulation results were also consistent with the monitoring results. These results can provide significant references for the operation safety of the dam and also present a new thought for the risk evaluation of similar dam engineering.

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“…It has wide engineering applications in South Africa, Canada, Japan, Australia, and America. Some achievements have been obtained in rock slopes [9][10][11], underground mining [8,[12][13][14], tunnels [15,16], oil and gas exploration and development [17], and electricity generation by hot dry rock [18], and so forth. Dam concrete is brittle and the apparent displacement is usually small when a microfracture occurs internally.…”

Section: Introductionmentioning

confidence: 99%

Microseismic Signal Characterization and Numerical Simulation of Concrete Beam Subjected to Three-Point Bending Fracture

Dai

Chun

et al. 2015

Journal of Sensors

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To study the generation mechanism and failure mode of cracks in mass concrete, microseismic monitoring is conducted on the fracture processes of the three-point bending roller compacted concrete (RCC) beam of Guanyinyan hydropower station. The spectrum characteristics of microseismic signals in different deformation and failure stages of the concrete beam are analyzed, and the identification method of the fracture stages and crack propagation precursors of concrete beam is established. Meanwhile, the Realistic Failure Process Analysis code (RFPA) is adopted to simulate and analyze the entire failure processes of concrete beam from its cracks initiation, development, propagation, and coalescence, until macroscopic fractures formation subjected to three-point bending test. The relation curve of the load, loaded displacement, and acoustic emission (AE) of concrete beam in the three-point bending test is also obtained. It is found that the failure characteristics of concrete beam obtained from numerical experiments agree well with the field physical test results. The heterogeneity of concrete is the major cause of zigzag propagation paths of beam cracks subjected to three-point bending tests. The results lay foundation for further exploring the formation mechanism of dam concrete cracks of Guanyinyan hydropower station.

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Microseismic Monitoring of Open Pit Slopes

Cited by 18 publications

References 1 publication

Microseismic data — a comparison between routine trigger method and continuous data processing

Microseismic data — a comparison between routine trigger method and continuous data processing

Integrated Analysis of the Formation Mechanism of Cracks in a Concrete Dam Using Microseismic Monitoring and Numerical Simulation

Microseismic Signal Characterization and Numerical Simulation of Concrete Beam Subjected to Three-Point Bending Fracture

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