Point Movement Trace Vs. The Range Of Mining Exploitation Effects In The Rock Mass

Sroka, Anton; Knothe, Stanisław; Tajduś, Krzysztof; Misa, Rafał

doi:10.1515/amsc-2015-0060

Cited by 9 publications

(8 citation statements)

References 2 publications

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“…The use of this solution showed that it predicts values higher than the measured ones and was applied to subsidence with a duration of up to 30 months, i.e., mainly related to phase I and II, rather than to phase III, i.e., residual, long-term subsidence. A similar solution was presented in the article by Hu [44], where authors tried to determine the value of the time factor c of Knothe's function, which relates only to the active subsidence process [45][46][47].…”

Section: Methods Of Forecasting the Residual Subsidence Value After Exploitation Endsmentioning

confidence: 98%

Analysis of Mining-Induced Delayed Surface Subsidence

et al. 2021

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The topic of residual subsidence is important in Europe as it defines possible surface deformation for closed mine areas. It has to be determined because of potential financial claims and damages of sensitive objects such as satellite dishes, precision mechanics objects, agriculture, forestry and hydrogeology, etc. Analyses of measured subsidence after the end of mining exploitation indicate that this process can last from several months to several dozen or even several hundred years, and the final surface subsidence is not known. It is dependent on the individual’s features of excavated medium, depth of exploitation, a system of exploitation, behaviour of surrounding rock masses, etc. In the article, the authors analysed the assessment of the subsidence process after the end of mining operations, based on the innovative method. This concerns the duration of the subsidence process and the size of the expected subsidence. The methodology was applied to the RAG Aktiengesellschaft company project where prognostic calculations were made for seven closed coal mines using unique results of precise height measurements carried out for more than 90 years by the German State Office for National Measurements (Landesvermessungsamt NRW) under the so-called levelling measurements net. These measurements are carried out every 2 years and serve to keep the altitude network in the whole state of Rhineland Westphalia up-to-date. The result of the prognosis for one case study, German mine Auguste-Victoria, is presented in the article.

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Section: Methods Of Forecasting the Residual Subsidence Value After Exploitation Endsmentioning

confidence: 98%

Analysis of Mining-Induced Delayed Surface Subsidence

et al. 2021

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“…The most important indicator of deformation, from the point of view of threat to civil structures, is horizontal deformation (i.a. Knothe, 1953b;Tajduś and Tajduś, 2015;Sroka et al, 2015;Malinowska and Hejmanowski, 2016).…”

Section: Solved Issuesmentioning

confidence: 99%

“…to the Knothe's definition -i.e. it is some 2.5 times higher than the standard value provided by Budryk. A comprehensive description of the formation of the B factor value studies to date can be found in the works of (Knothe and Sroka, 2010) as well as (Tajduś and Tajduś, 2015) and (Sroka et al, 2015). They are mostly applicable to the dependencies described by the following formulas:…”

Section: Solved Issuesmentioning

confidence: 99%

Determination of the horizontal deformation factor for mineral and fluidized deposits exploitation

Sroka¹

2017

Acta Geodynamica Et Geomaterialia

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In this article, the authors use the existing theoretical foundations and partial solutions to provide a general formula, which can be used to determine the value of horizontal deformation factor B for various applications of the Knothe theory. This applies to the calculation of surface deformation not only in the case of hard coal mining, but also in the case of salt mining by borehole. Convergence resulted from mining may cause deformations of caverns used to store liquid and gaseous fuels or the deformations related to the fluidized bed extraction. The calculations for the new analytical model are presented in the examples of the Etzel cavern (Germany) and the Upper Silesian Coal Basin (Poland).

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“…[8][9][10][11]. In the 1950s, Knothe proposed a mining in uence function that conformed to normal distribution according to the observation data [12,13] by treating the surface movement process caused by mining as a random process, Litwiniszyn put forward the random medium theory, arguing that the mining in uence function followed normal distribution as well [14]; In 1965, Liu Baochen and Liao Guohua adopted the probability theory to mathematically demonstrate that the mining influence function conformed to normal distribution, which led to the Probability Integral Method [15][16][17][18][19][20][21][22]. Among the three calculation methods as mentioned above, the Knothe influence function method assumes that the mining influence function conforms to normal distribution based on the observation data.…”

Section: Introductionmentioning

confidence: 99%

Normality Test for Influence Function of Mining Surface Subsidence Based on Network Observation Station

et al. 2022

Mathematical Problems in Engineering

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Coal is the primary energy source in China, while underground mining is the mainstream way of coal mining. By triggering surface movement and deformation, underground mining can cause damage to arable land, buildings, roads, and so on, which is detrimental to the ecological environment in the mining area. In order to assess the severity of damage caused by this to the ground buildings and ecological environment in the mining area, it is necessary to predict mining-induced surface subsidence before the mining activities are carried out. Currently, the most used prediction method is the Probability Integral Method. It is based on probabilistic theory to mathematically demonstrate that the surface downwelling caused by underground extraction conforms to normal distribution. However, there is a lack of validation with measured subsidence basin data. Since the 1960s, China has been paying increased attention to the study of mining subsidence. However, there are still few network stations built across China to monitor subsidence basin. Herein, SPSS software is applied to re-analyze these valuable historical data. By analyzing the observation results and comparing them with the calculation results as obtained by using the probability integral method, it can be found out that the surface subsidence in the center of the subsidence basin conforms to normal distribution, not the subsidence at the edge of the subsidence basin. Therefore, it is inevitable for errors to occur at the edge of the subsidence basin when the normal distribution function is used as the mining influence function to calculate the surface subsidence. This conclusion is expected to provide practical reference for the prediction of surface subsidence in coal mines, and this experience can be extended to the mining of other solid minerals.

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Point Movement Trace Vs. The Range Of Mining Exploitation Effects In The Rock Mass

Cited by 9 publications

References 2 publications

Analysis of Mining-Induced Delayed Surface Subsidence

Analysis of Mining-Induced Delayed Surface Subsidence

Determination of the horizontal deformation factor for mineral and fluidized deposits exploitation

Normality Test for Influence Function of Mining Surface Subsidence Based on Network Observation Station

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