The velocity of roof deflection as an indicator of underground workings stability – Case study from polish deep copper mines

Stolecki, Lech; Grzebyk, W.

doi:10.1016/j.ijrmms.2021.104717

Cited by 6 publications

(7 citation statements)

References 8 publications

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“…The sensors have been equipped with a signaling diode, which informs about the present phase in which the working roof is located using an appropriate color. In case of Polish copper ore mines, this is the first, and currently the only quantitative measurement method enabling estimation of the roof collapse risk occurrence [20].…”

Section: Discussionmentioning

confidence: 99%

“…Preliminary research on the inclinometric roof monitoring method was conducted in 2011-2017 and was widely described in the publication [20]. The assessment of roof layer stability is performed using inclinometer sensors (CNSs) and a wireless communication terminal (Elfin, Wrocław, Poland) (Figure 3).…”

Section: The Inclinometric Methods Of Evaluating the Roof Stabilitymentioning

confidence: 99%

“…In the inclinometric method, the so-called criterion for assessing the stability of roof layers was used (Figure 5). It is a curve illustrating the stages of roof destabilization as a function of time and the size of the slope angle change [20]. Based on the collected database a real-time warning algorithm has been developed for operational purposes.…”

Section: The Inclinometric Methods Of Evaluating the Roof Stabilitymentioning

confidence: 99%

“…Based on the collected database a real-time warning algorithm has been developed for operational purposes. This algorithm allows to inform about individual destabilization thresholds [20]. The developed algorithm was implemented into the build-in sensor software.…”

Section: The Inclinometric Methods Of Evaluating the Roof Stabilitymentioning

confidence: 99%

“…In recent years, an inclinometric method has also been tested and applied. This method consists in registering changes in the roof inclination angle using an inclinometer sensor, rigidly attached to the tip of the rockbolt installed in the roof [20]. The article presents the results of the measurements of the deflection of the roof layers carried out in the Polish copper ore mine Polkowice-Sieroszowice owned by KGHM Polska Miedź S.A.…”

Section: Introductionmentioning

confidence: 99%

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Practical Use of Measuring the Deflection of Roof Layers in the Assessment of the Stability of Mining Excavations in the Polish Copper Ore Mine “Polkowice-Sieroszowice”

Stolecki

Szczerbiński

2021

Mining

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The paper presents the results of long-term continuous measurements of the deflection of the roof layers in the underground copper mine Polkowice-Sieroszowice, Poland belonging to KGHM Polska Miedź S.A. The measurements were performed with the use of the inclinometric method consisting of continuous registration of changes in the angle of inclination of the roof strata. The measurements were carried out using an inclinometer sensor fixed to the end of a rockbolt in the roof. Measurements presented in the article were made in various regions of the underground mine. The monitoring covered: The exploitation front, machinery chamber and the region of the experimental longwall mining of copper ore. The obtained results proved the usefulness of the developed method in the process of the evaluation of the stability of mining excavations. The sensors were highly sensitive and performed the measurements in a simple way; highly accurate and reliable results were obtained.

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Section: Discussionmentioning

confidence: 99%

Section: The Inclinometric Methods Of Evaluating the Roof Stabilitymentioning

confidence: 99%

Section: The Inclinometric Methods Of Evaluating the Roof Stabilitymentioning

confidence: 99%

Section: The Inclinometric Methods Of Evaluating the Roof Stabilitymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Practical Use of Measuring the Deflection of Roof Layers in the Assessment of the Stability of Mining Excavations in the Polish Copper Ore Mine “Polkowice-Sieroszowice”

Stolecki

Szczerbiński

2021

Mining

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Evaluation Method of Roof Damage Degree and a Case Study in Maoping Lead-Zinc Mine, Yunnan

Yang

Qiao

Wang

et al. 2022

Shock and Vibration

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With the continuous increase in the mining depth of underground mineral resources, the geological conditions encountered in mining have become more complex. The complex geological conditions have led to varying degrees of roof damage, especially the frequent occurrence of roof collapse accidents in metal mines, causing huge losses to mining enterprises. How to evaluate the risk of roof subsidence, falling, and even collapse under different geological conditions has become the primary issue. This article first selects the main evaluation indicators in the domestic and foreign roadway roof failure research literature for statistical analysis. Then, according to the statistical results, a classification approach of roof damage degree using the fuzzy comprehensive clustering method is established with roof rock strength, broken degree, roadway section size, buried depth, and roof sinking amount as evaluation indicators. The damage of the top plate is divided into five grades: minor damage, obvious damage, serious damage, extremely serious damage, and devastating damage. Finally, the established evaluation method was applied to the project site-supporting work of the 760 m main transport roadway in Yunnan Maoping Lead-Zinc Mine. The evaluation result is consistent with the actual situation on-site. The research results can provide a reference for the roof stability analysis under the background of this project and similar projects and at the same time help the next step in the classification control of different levels of roof stability and the design of the overall roadway support.

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Archives of Mining Sciences

Tomaszewski,

Rapiński,

Stolecki

et al. 2022

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Switching EdgE dEtEctor aS a tool for SEiSmic EvEntS dEtEction BaSEd on gnSS timESEriEScontemporary mine exploitation requires information about the deposit itself and the impact of mining activities on the surrounding surface areas. in the past, this task was performed using classical seismic and geodetic measurements. Nowadays, the use of new technologies enables the determination of the necessary parameters in global coordinate systems. For this purpose, the relevant services create systems that integrate various methods of determining interesting quantities, e.g., seismometers / GNSS / PSinSAr. These systems allow detecting both terrain deformations and seismic events that occur as a result of exploitation.Additionally, they enable determining the quantity parameters that characterise and influence these events. however, such systems are expensive and cannot be set up for all existing mines. Therefore, other solutions are being sought that will also allow for similar research. in this article, the authors examined the possibilities of using the existing GNSS infrastructure to detect seismic events. For this purpose, an algorithm of automatic discontinuity detection in time series "Switching Edge Detector" was used. The reference data were the results of GNSS measurements from the integrated system (seismic / GNSS / psinsaR) installed on the lGcB (legnica-Głogów copper Belt) area. The GNss data from 2020 was examined, for which the integrated system registered seven seismic events. The switching Edge Detector algorithm proved to be an efficient tool in seismic event detection.

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The velocity of roof deflection as an indicator of underground workings stability – Case study from polish deep copper mines

Cited by 6 publications

References 8 publications

Practical Use of Measuring the Deflection of Roof Layers in the Assessment of the Stability of Mining Excavations in the Polish Copper Ore Mine “Polkowice-Sieroszowice”

Practical Use of Measuring the Deflection of Roof Layers in the Assessment of the Stability of Mining Excavations in the Polish Copper Ore Mine “Polkowice-Sieroszowice”

Evaluation Method of Roof Damage Degree and a Case Study in Maoping Lead-Zinc Mine, Yunnan

Archives of Mining Sciences

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