Rock mechanical investigations of seismic events in a deep longwall coal mine

Alber, Michael; Fritschen, Ralf; Bischoff, M.; Meier, Thomas

doi:10.1016/j.ijrmms.2008.07.014

Cited by 122 publications

(64 citation statements)

References 7 publications

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“…The second source mechanism is interpreted as S. Wehling-Benatelli et al: Brittle failure in coal mining environment 407 the failure of remnant pillar structures from previously mined out seams overlying the currently excavated seam or tectonically weak structures such as faults that are reactivated by the mining induced stresses. These findings are consistent with the proposed model of rock failure by Alber et al (2009).…”

Section: Hamnet -A Temporary Local Network For Seismic Monitoring Ofsupporting

confidence: 92%

“…Bischoff et al, 2010a;Walter et al, 1997). The relative relocation of events belonging to these clusters suggests that their source depths are either slightly above or below the depth of active mining in agreement with the location of more competent rock layers which exhibit violent failure behaviour in laboratory experiments conducted by Alber et al (2009). The absence of such events in the South African data sets might be explained by the different geological settings.…”

Section: Frequency Magnitude Distributions and Indications For Differsupporting

confidence: 55%

“…They might only occur when the layers fail over their entire thickness. It is suggested that the competent layers accumulate stresses up to the strength of the layer itself resulting in events which only exhibit rather high magnitudes directly reflecting the thickness of the breaking sand-/siltstone layers (see also Alber et al, 2009;Bischoff et al, 2010a). Another explanation for the missing lower magnitude events in these event clusters could be that a minimum patch size with a critical slip distance is required in accordance with a slipweakening model of shear failure (e.g.…”

Section: Frequency Magnitude Distributions and Indications For Differmentioning

confidence: 99%

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Indications for different types of brittle failure due to active coal mining using waveform similarities of induced seismic events

et al. 2013

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Abstract. Longwall mining activity in the Ruhr coal mining district leads to mining-induced seismicity. For detailed studies the seismicity of a single longwall panel beneath the town of Hamm-Herringen in the eastern Ruhr area was monitored between June 2006 and July 2007 with a dense temporary network of 15 seismic stations. More than 7000 seismic events with magnitudes between −1.7 ≤ M L ≤ 2.0 were detected and localized in this period. Most of the events occurred in the vicinity of the moving longwall face.In order to find possible differences in the brittle failure types of these events an association of the events to distinct clusters is performed based on their waveform characteristics. This task is carried out using a new clustering algorithm utilizing a network similarity matrix which is created by combining all available 3-component single station similarity matrices. The resultant network matrix is then sorted with respect to the similarity of its rows leading to a sorted matrix immediately indicating the clustering of the event catalogue. Finally, clusters of similar events are extracted by visual inspection.This approach results in the identification of several large clusters which are distinct with respect to their spatial and temporal characteristics as well as their frequency magnitude distributions. Comparable clusters are also found with a conventional single linkage approach, however, the new routine seems to be able to associate more events to specific clusters without merging the clusters.The nine largest observed clusters can be tentatively divided into three different groups that indicate different types of brittle failure. The first group consists of the two largest clusters which constitute more than half of all recorded events. Results of a relative relocation using cross-correlation data suggest that these events are confined to the extent of the mined out longwall and cluster close to the edges of the active longwall at the depth of active mining. These events occur in lockstep with the longwall advance and exhibit a high b value of the Gutenberg-Richter relation (GR) of about 1.5 to 2.5 and consist of small magnitude events. Thus, these events represent the immediate energy release adjacent to the mined out area.The second group consists of clusters located either slightly above or below the depth of active mining and occurring at the current position of the longwall face within the confines of the longwall. They consist of generally stronger events and do not follow GR. This activity might be linked to the failure of more competent layers above and below the mined out seam resulting in larger magnitude events.Finally, one cluster represents seismic activity with a rather low b value below 1 and events located partly towards the north of the longwall which are delayed with respect to the advance of the longwall face. These events are interpreted as brittle failure on pre-existing tectonic structures reactivated by the mining activity.Published by Copernicus Publications on behalf of t...

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Section: Hamnet -A Temporary Local Network For Seismic Monitoring Ofsupporting

confidence: 92%

Section: Frequency Magnitude Distributions and Indications For Differsupporting

confidence: 55%

Section: Frequency Magnitude Distributions and Indications For Differmentioning

confidence: 99%

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Indications for different types of brittle failure due to active coal mining using waveform similarities of induced seismic events

et al. 2013

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“…In the field of rock mechanics, the simulation of fault-slip in underground mines has been carried out, aiming at estimating the mechanical properties of faults, evaluating fault-slip potential, and investigating the effect of faults on ambient stress states, albeit the classical Mohr-Coulomb criterion has been mainly used under static conditions (Alber, Fritschen, Bischoff, & Meier, 2009;Hofmann & Scheepers, 2011;Sneilling et al, 2013).…”

Section: Numerical Analysismentioning

confidence: 99%

“…It is the classical Mohr-Coulomb criterion that is used the most widely for the stability analysis of faults in underground mines (Alber et al, 2009;Hofmann & Scheepers, 2011;Potvin, Jarufe, & Wesseloo, 2010;Sjoberg et al, 2012;Sneilling et al, 2013) because of its simplicity. The failure criterion is expressed as follows:…”

Section: Static Shear Strength Modelsmentioning

confidence: 99%

Dynamic modelling of a mining-induced fault slip

Sainoki¹,

Mitri²

2013

Rock Mechanics for Resources, Energy and Environment

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Characteristics and contributing factors of major coal bursts in longwall mines

Zhao

Qin

Xiao

et al. 2022

Energy Science & Engineering

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Coal burst has become one of the most serious hazards in longwall coal mines of many countries, and extensive studies have been conducted on the mechanism, prediction, and prevention of coal bursts. However, most of these studies focus on qualitative descriptions of burst environments and specific case analyses. Few studies have been carried out to explore knowledge through a number of past coal bursts in longwall mines. The main objective is to quantitatively analyze the current burst‐prone conditions in longwall coal mines of China and to summarize corresponding lessons. A database consisting of 54 major coal bursts was established. The characteristics and contributing factors of involved coal bursts were analyzed quantitatively, and high‐risk areas that are common in coal mines were then identified. Finally, some suggestions and lessons were proposed. This study may help for identifying controlling factors and high‐risk areas at a specific mine, and it might provide insights into the control of coal bursts in longwall coal mines.

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Rock mechanical investigations of seismic events in a deep longwall coal mine

Cited by 122 publications

References 7 publications

Indications for different types of brittle failure due to active coal mining using waveform similarities of induced seismic events

Indications for different types of brittle failure due to active coal mining using waveform similarities of induced seismic events

Dynamic modelling of a mining-induced fault slip

Characteristics and contributing factors of major coal bursts in longwall mines

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