scholarly journals Calculation of Residual Surface Subsidence Above Abandoned Longwall Coal Mining

2020 ◽  
Vol 12 (4) ◽  
pp. 1528 ◽  
Author(s):  
Ximin Cui ◽  
Yuling Zhao ◽  
Guorui Wang ◽  
Bing Zhang ◽  
Chunyi Li
Keyword(s):  
Coal Mining ◽  
Longwall Mining ◽  
Land Reclamation ◽  
Surface Subsidence ◽  
Mining Subsidence ◽  
First Year ◽  
Longwall Coal Mining ◽  
The Stability ◽  
Ecological Reconstruction

Exhausted or abandoned underground longwall mining may lead to long-term residual subsidence on surface land, which can cause some problems when the mined-out land is used for construction, land reclamation and ecological reconstruction. Thus, it is important to assess the stability and suitability of the land with a consideration of residual surface subsidence. Assuming a linear monotonic decrease in the annual residual surface subsidence, the limit of the sum of the annual residual subsidence factor, and continuity between surface subsidence in the last year of the weakening period and the residual surface subsidence in the first year, we establish a model to calculate the duration of residual subsidence and the annual residual surface subsidence factor caused by abandoned longwall coal mining. The duration of residual surface subsidence increases with the increase in mining thickness as well as the factor of extreme residual subsidence. The proposed method can quantitatively calculate the annual residual subsidence, the accumulative residual subsidence, and the potential future accumulative residual subsidence. This approach can be used to reasonably evaluate the stability and suitability of old mining subsidence areas and will be beneficial for the design of mining subsidence land reclamation and ecological reconstruction.

Chapter 11 Coal mining subsidence in the UK

2020 ◽  
Vol 29 (1) ◽  
pp. 291-309 ◽  
Author(s):  
Laurance Donnelly
Keyword(s):  
Coal Mining ◽  
Longwall Mining ◽  
Ground Surface ◽  
Mining Subsidence ◽  
Ground Movement ◽  
Working Face ◽  
Mine Roadway ◽  
Coal Mining Subsidence ◽  
The Uk

AbstractOne of the geohazards associated with coal mining is subsidence. Coal was originally extracted where it outcropped, then mining became progressively deeper via shallow workings including bell pits, which later developed into room-and-pillar workings. By the middle of the 1900s, coal was mined in larger open pits and underground by longwall mining methods. The mining of coal can often result in the subsidence of the ground surface. Generally, there are two main types of subsidence associated with coal mining. The first is the generation of crown holes caused by the collapse of mine entries and mine roadway intersections and the consolidation of shallow voids. The second is where longwall mining encourages the roof to fail to relieve the strains on the working face and this generates a subsidence trough. The ground movement migrates upwards and outwards from the seam being mined and ultimately causes the subsidence and deformation of the ground surface. Methods are available to predict mining subsidence so that existing or proposed structures and land developments may be safeguarded. Ground investigative methods and geotechnical engineering options are also available for sites that have been or may be adversely affected by coal mining subsidence.

scholarly journals Long-term Analysis of the Effects of Production Management in Coal Mining in Poland

Energies ◽  
2019 ◽  
Vol 12 (16) ◽  
pp. 3146 ◽  
Author(s):  
Izabela Jonek-Kowalska
Keyword(s):  
Coal Mining ◽  
Production Management ◽  
Coal Mines ◽  
Work Productivity ◽  
Policy Implications ◽  
Productivity Improvement ◽  
Mining Conditions ◽  
The Stability ◽  
Efficiency And Productivity

The primary aim of this article is to examine financial efficiency and work productivity, as well as their determinants, in selected Polish coal mines in 1998–2015. To achieve this goal, after introducing a justification for the choice of subject and the literature studies, the research methodology is presented, and research results are subsequently described and analyzed. Next, based on the main conclusions, model regularities and policy implications regarding efficiency and productivity improvement in Polish coal mining enterprises are established. The research for this study was conducted in five Polish coal mines, which were chosen on the basis of criteria aimed at ensuring the results’ comparability and the stability of organizational and mining conditions in the analyzed research period.

Geological Environmental Impact Assessment of Mining Subsidence Area Based on Multilayer Fuzzy Synthetic Evaluation

2014 ◽  
Vol 1010-1012 ◽  
pp. 254-258 ◽  
Author(s):  
Jia Xing Xu ◽  
Hua Zhao ◽  
Gang Li
Keyword(s):  
Coal Mining ◽  
Land Reclamation ◽  
Mining Subsidence ◽  
Geological Environment ◽  
Fuzzy Synthetic Evaluation ◽  
Subsidence Area ◽  
Coal Mining Subsidence ◽  
Landscape Ecological ◽  
Different Levels ◽  
Synthetic Evaluation

Multilayer fuzzy synthetic evaluation is an effective method of the qualitative analysis into the quantitative analysis, and can reflect the different levels of objective things factors, avoiding the difficult to assign weights due to excessive factors. Geological environment of Jiawang coal mining subsidence area in Xuzhou was evaluated with an indices system based on multilayer fuzzy synthetic evaluation. Through evaluation, the serious damage region of geological mining of Jiawang mining subsidence area is 1918.966 hm2, and the more serious damage region is 2524.088 hm2, and the less affected area is 1366.971 hm2. The results showed that the geological environment of Jiawang mining subsidence damage is more serious. The farmland was destroyed seriously, and water due to land collapse was quite serious, which was difficult to land reclamation. It is believed that this work may provide scientific reference for land reclamation and landscape ecological restoration of coal mining subsidence area.

Chongqing Mine Ecological Restoration and Management Research

2013 ◽  
Vol 864-867 ◽  
pp. 1307-1310
Author(s):  
Ya Jun Zang
Keyword(s):  
Coal Mining ◽  
Ecological Restoration ◽  
Land Reclamation ◽  
Mining Area ◽  
Control Measures ◽  
Management Research ◽  
Paper Briefly ◽  
Research Results ◽  
Geological Disasters ◽  
Ecological Reconstruction

This paper briefly introduces the importance of the process of coal mining and mining later land reclamation and ecological restoration and the characteristics of the land ecological reconstruction of mining area. According to the research results of mine disaster in Chongqing area and the existing environment prevention and harnessing measures, make division of geological disasters, and put forward the corresponding control measures.

Three Dimensional Mapping of Ground Deformation Disasters Caused by Underground Coal Mining

2012 ◽  
Vol 524-527 ◽  
pp. 503-507
Author(s):  
Zhao Hui Liu ◽  
Li Cui ◽  
Tao Zhang ◽  
Qiang Liu ◽  
Er Yang Chen ◽  
...  
Keyword(s):  
Land Reclamation ◽  
Underground Mining ◽  
Ground Deformation ◽  
Three Dimensional ◽  
Google Earth ◽  
Surface Subsidence ◽  
Mining Subsidence ◽  
Ground Subsidence ◽  
Three Dimensional Mapping ◽  
Probability Integral Method

The ground subsidence and deformations caused by underground mining not only affect people’s life tremendously, but also ruin the local eco-environment. These phenomenons (disasters) should be controlled and rehabilitated. For this purpose, in this paper, the characteristic and values of surface subsidence, deformation and movements were evaluated and calculated using some kinds of technological theories and methodology such as probability integral method and so on. Based on the Google Earth image and digital relief maps as well as the predicted results and data, several types of 3D thematic maps of mining subsidence and deformation were designed and mapped in order to carry on the land reclamation or rehabilitation in the mining subsidence and deformation areas. The research results can be fitted well with the reality of surface subsidence and deformations.

scholarly journals 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”

Mining ◽  
2021 ◽  
Vol 2 (1) ◽  
pp. 13-31
Author(s):  
Lech Stolecki ◽  
Krzysztof Szczerbiński
Keyword(s):  
Longwall Mining ◽  
Underground Mine ◽  
Copper Ore ◽  
Copper Mine ◽  
Highly Sensitive ◽  
Continuous Registration ◽  
The Stability ◽  
Roof Strata ◽  
Made In

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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