Microseismic frequency-spectrum evolutionary rule of rockburst triggered by roof fall

Lu, Cai‐Ping; Li, Dou; Zhang, Nong; Xue, Jianyang; Wang, Xiaonan; Liu, Hui; Jun-wei, Zhang

doi:10.1016/j.ijrmms.2013.08.022

Cited by 136 publications

(61 citation statements)

References 19 publications

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“…In recent years, and with the improvement of monitoring and interpretation techniques, microseismic monitoring has been accepted as a standard approach to understand and predict rock bursts in coal mines (Fujii et al, 1997;Kabiesz and Makówka, 2009;Lu et al, 2013;Cai et al 2014). Li et al (2007) suggested that rock bursts might induce high gas emission in underground coal mining.…”

Section: Introductionmentioning

confidence: 99%

Seismic monitoring and analysis of excessive gas emissions in heterogeneous coal seams

Durucan

Jamnikar

et al. 2015

International Journal of Coal Geology

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Uncontrolled and excessive gas emissions pose a serious threat to safety in underground coal mining. In a recently completed research project, a suite of monitoring techniques were employed to assess the dynamic response of the coal seam being mined to longwall face advance at Coal Mine Velenje in Slovenia. Together with continuous monitoring of gas emissions, two seismic tomography measurement campaigns and a microseismic monitoring programme were implemented at one longwall top coal caving panel. Over 2,000 microseismic events were recorded during a period of four months. Over the same period, there also was a recorded episode of relatively high gas emission in the same longwall district. In this paper, a detailed analysis of the processed microseismic data collected during the same monitoring period is presented. Specifically, the analysis includes the spatial distribution of the microseismic events with respect to the longwall face advance, the magnitude of the energy released per week and its temporal evolution. Examination of the spatial distribution of the recorded microseismic events has shown that most of the microseismic activity occurred ahead of the advancing face. Furthermore, the analysis of the gas emission and microseismic monitoring data has suggested that there is a direct correlation between microseismicity and gas emission rate, and that gas emission rate tends to reach a peak when seismic energy increases dramatically. It is believed that localised stress concentration over a relatively strong xylite-rich zone and its eventual failure, which was also identified by the seismic tomography measurements, may have triggered the heightened microseismic activity and the excessive gas emission episode experienced at the longwall panel monitored.

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Section: Introductionmentioning

confidence: 99%

Seismic monitoring and analysis of excessive gas emissions in heterogeneous coal seams

Durucan

Jamnikar

et al. 2015

International Journal of Coal Geology

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“…The technology in vibration instrumentation and measurements has advanced significantly over past four decades, particularly in the area of industrial machinery health monitoring. Our study focuses on the vibration caused by rock damage, and a research for the microseismic frequency-spectrum of rock deformation, fracturing, and failure has suggested that the low-frequency components (<25 Hz) of monitoring signals are the key factors for rock damage assessment [17,18]. The sensitivity of sensors used for measuring these parameters varies with the frequency of the vibration, and the common understanding is to use amplitude sensors to pick up low-frequency signals, velocity sensors in the middle ranges, and accelerometers at higher frequencies (accelerometers mentioned here mainly for the piezoelectric accelerometer).…”

Section: Monitoring Methodmentioning

confidence: 99%

MEMS Inertial Sensor for Strata Stability Monitoring in Underground Mining: An Experimental Study

Zhang

et al. 2018

Shock and Vibration

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To investigate the fracture and deformation characteristics of the strata in underground mining as well as the effectiveness and sensitivity of the MEMS inertial sensor for strata stability monitoring, a low cost, small size, and easy implementation inertial MEMS sensor module was redeveloped. Sensor modules were installed on roof strata in an underground mining equivalent material simulation experiment. Then, monitoring signal of two modules near the middle and end section of caving strata was processed. The processed signal presents stepped change, and each step consists a vibration stage and a stable stage. Further analysis of each stage, a strategy to estimate the deformation and stability of strata, can be reached: the duration of each vibration stage and complete stage with rising trend indicates that the deformation of strata is growing to the ultimate state. In this study, this method could recognize the destructive deformation of strata at least 1 hour before the strata caving.

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“…This software can help to study the evolution law of roof strata migration and the stress of the coal seam during the working face advancing [23]. As previous studies have shown that microseismic events are closely related to the energy distribution in coal and rocks [24,25], this paper tries further exploring the relationship between them, and this section will use 3DEC numerical simulation software to study strain energy distribution characteristics of coal seam under the thick and hard roof deformation and failure in Tashan mine and, then, compare it with the results of field microseismic test. By doing so, this paper may provide a research way for studying the energy distribution characteristics of the surrounding rock under similar conditions.…”

Section: Strain Energy Distribution Characteristics Of Coal Seam Undementioning

confidence: 99%

The Breaking Span of Thick and Hard Roof Based on the Thick Plate Theory and Strain Energy Distribution Characteristics of Coal Seam and Its Application

Liu

et al. 2017

Mathematical Problems in Engineering

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In mining engineering, the thick and hard roof threatens the safe production. Based on Reissner plate theory and combined with weighted residual method, with four edges clamped as the boundary conditions, this paper deduces the theoretical formula of the first breaking span of thick and hard roof. Based on Vlasov plate theory, with four edges simply supported as the boundary conditions, this paper deduces the theoretical formula of the periodic breaking span of thick and hard roof. The two formulas are used to verify the breaking span of thick and hard roof of Tashan Coal Mine, proving that its accuracy is higher than that of traditional beam theory. This paper studies the distribution characteristics of strain energy density in front of the coal seam during the mining process by numerical simulation, which is compared with the results of field microseismic experiments. It is found that the strain energy density of the coal seam has a good correlation with the probability of microseismic events. This paper provides theoretical support for more precise calculation of breaking span of the thick and hard roof and technical support for the practical stability analysis of the surrounding rock under the thick and hard roof.

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Microseismic frequency-spectrum evolutionary rule of rockburst triggered by roof fall

Cited by 136 publications

References 19 publications

Seismic monitoring and analysis of excessive gas emissions in heterogeneous coal seams

Seismic monitoring and analysis of excessive gas emissions in heterogeneous coal seams

MEMS Inertial Sensor for Strata Stability Monitoring in Underground Mining: An Experimental Study

The Breaking Span of Thick and Hard Roof Based on the Thick Plate Theory and Strain Energy Distribution Characteristics of Coal Seam and Its Application

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