Application of Seismic Parameters for Estimation of Destress Blasting Effectiveness

Wojtecki, Łukasz; Koníček, Petr; Mendecki, Maciej J.; Zuberek, Wacław M.

doi:10.1016/j.proeng.2017.05.241

Cited by 7 publications

(13 citation statements)

References 9 publications

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“…The scalar seismic moment M 0 of tremors provoked by the long-hole destress blasting ranged between 7.57 9 10 9 Nm and 8.35 9 10 11 Nm (Wojtecki et al 2017a;. These tremors were provoked by the firing of 42-576 kg of explosives (Wojtecki et al 2017a;. The scalar seismic moment M 0 of tremors provoked by the blasting for roof falling equalled from 1.44 9 10 10 Nm to 1.47 9 10 11 Nm (Wojtecki et al 2017a(Wojtecki et al , 2019.…”

Section: Seismic Source Parametersmentioning

confidence: 96%

“…An analogous observation was done for the effects of the long-hole destress blasting in roof rocks and blasting for roof falling in one of the Polish hard coal mines. The scalar seismic moment M 0 of tremors provoked by the long-hole destress blasting ranged between 7.57 9 10 9 Nm and 8.35 9 10 11 Nm (Wojtecki et al 2017a;. These tremors were provoked by the firing of 42-576 kg of explosives (Wojtecki et al 2017a;.…”

Section: Seismic Source Parametersmentioning

confidence: 99%

“…The moment magnitude M w is usually smaller than the local magnitude M L (Baruah et al 2012;Lizurek et al 2015). The moment magnitude M w equalled from 0.45 to 1.78 for tremors provoked by the long-hole destress blasting in roof rocks of a coal seam (Wojtecki et al 2017a, b), and from 0.67 to 1.29 for tremors provoked by the blasting for roof falling (Wojtecki et al 2017a(Wojtecki et al , 2019.…”

Section: Seismic Source Parametersmentioning

confidence: 99%

“…These tremors were provoked by the firing of 42-576 kg of explosives (Wojtecki et al 2017a;. The scalar seismic moment M 0 of tremors provoked by the blasting for roof falling equalled from 1.44 9 10 10 Nm to 1.47 9 10 11 Nm (Wojtecki et al 2017a(Wojtecki et al , 2019. The mass of explosives fired was between 24 and 120 kg (Wojtecki et al 2017a(Wojtecki et al , 2019.…”

Section: Seismic Source Parametersmentioning

confidence: 99%

“…This way of calculation differs from the numerical integration method described previously. The seismic energy E c of tremors provoked by the long-hole destress blasting in roof rocks of a coal seam equalled from 3.7 9 10 3 J to 8.4 9 10 5 J (Wojtecki et al 2017a;. The seismic energy E c of tremors provoked by the blasting for roof falling ranged between 7.4 9 10 3 J and 9.8 9 10 4 J (Wojtecki et al 2017a, 2019).…”

Section: Seismic Source Parametersmentioning

confidence: 99%

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The Seismic Source Parameters of Tremors Provoked by Long-Hole Destress Blasting Executed During the Longwall Mining of a Coal Seam Under Variable Stress Conditions

Wojtecki

Mendecki

Gołda

et al. 2020

Pure Appl. Geophys.

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The underground mining of coal seams in the Upper Silesian Coal Basin is carried out at great depths and mostly in the presence of remnants or edges of other surrounding coal seams, i.e. under the condition of high stress level in the rock mass. Therefore, this mining is accompanied by rockburst hazard and suitable preventive action is required. Long-hole destress blasting plays an important role and is commonly applied in rockburst prevention in underground hard coal mines. Estimated blasting effectiveness is important when designing rockburst prevention. It is commonly estimated on the basis of the seismic energy of a provoked tremor. The seismic source parameters have already been considered for this purpose. Additional information about the effects of long-hole destress blasting could be contemplated in the planning of active rockburst prevention. The seismic source parameters of tremors provoked by long-hole destress blasting have been calculated and are presented in this article. Destress blasts were performed during the longwall mining of coal seam no. 506 in one of the hard coal mines in the Upper Silesian Coal Basin. They were executed from the longwall face, in order to destress the rock mass ahead of it. Parameters of the blasts were variable and they were modified according to geological and mining conditions and the observed level of rockburst hazard. The seismic source parameters have been determined for tremors provoked directly after firing explosives and for tremors occurring in the waiting time, and they have been compared with each other.

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Section: Seismic Source Parametersmentioning

confidence: 96%

Section: Seismic Source Parametersmentioning

confidence: 99%

Section: Seismic Source Parametersmentioning

confidence: 99%

Section: Seismic Source Parametersmentioning

confidence: 99%

Section: Seismic Source Parametersmentioning

confidence: 99%

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The Seismic Source Parameters of Tremors Provoked by Long-Hole Destress Blasting Executed During the Longwall Mining of a Coal Seam Under Variable Stress Conditions

Wojtecki

Mendecki

Gołda

et al. 2020

Pure Appl. Geophys.

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Geophysical Evaluation of Effectiveness of Blasting for Roof Caving During Longwall Mining of Coal Seam

Wojtecki

Koníček

Mendecki

et al. 2019

Pure Appl. Geophys.

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Deep longwall mining of coal seams is made in the Upper Silesian Coal Basin (USCB) under complicated and mostly unfavourable geological and mining conditions. Usually, it is correlated with rockburst hazard mostly at a high level. One of the geological factors affecting the state of rockburst hazard is the presence of competent rocks in the roof of extracted coal seams, so rock falling behind the longwall face does not occur, and hanging-up of roof rocks remains. The long-lasting absence of caving may lead to an occurrence of high-energy tremor in the vicinity of the longwall face. Roof caving behind the longwall face may be forced by blasting. The column of explosives is then located in blastholes drilled in layers of roof rocks, e.g. sandstones behind the longwall face. In this article, a characterization of tremors initiated by blasts for roof caving during underground extraction of coal seam no. 507 in one of the collieries in the USCB has been made using three independent methods. By the basic seismic effect method, the effectiveness of blasting is evaluated according to the seismic energy of incited tremors and mass of explosives used. According to this method, selected blasts gave extremely good or excellent effect. An inversion of the seismic moment tensor enables determining the processes happening in the source of tremors. In the foci of provoked tremors the slip mechanism dominated or was clearly distinguished. The expected explosion had lesser significance or was not present. By the seismic source parameters analysis, among other things, an estimation of the stress drop in the focus or its size may be determined. The stress drop in the foci of provoked tremors was in the order of 105 Pa and the source radius, according to the Brune’s model, varied from 44.3 to 64.5 m. The results of the three mentioned methods were compared with each other and observations in situ. In all cases the roof falling was forced.

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A new hybrid model of information entropy and unascertained measurement with different membership functions for evaluating destressability in burst-prone underground mines

Zhou

Chen

et al. 2020

Engineering with Computers

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Application of Seismic Parameters for Estimation of Destress Blasting Effectiveness

Cited by 7 publications

References 9 publications

The Seismic Source Parameters of Tremors Provoked by Long-Hole Destress Blasting Executed During the Longwall Mining of a Coal Seam Under Variable Stress Conditions

The Seismic Source Parameters of Tremors Provoked by Long-Hole Destress Blasting Executed During the Longwall Mining of a Coal Seam Under Variable Stress Conditions

Geophysical Evaluation of Effectiveness of Blasting for Roof Caving During Longwall Mining of Coal Seam

A new hybrid model of information entropy and unascertained measurement with different membership functions for evaluating destressability in burst-prone underground mines

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