scholarly journals  Social forest functions of reclaimed spoil heaps in the Ostrava-Karvina district

2012 ◽  
Vol 58 (No. 5) ◽  
pp. 203-212
Author(s):  
E. Lacková ◽  
P. Kupec ◽  
J. Polanská ◽  
B. Stalmachová
Keyword(s):  
Coal Mining ◽  
Mining District ◽  
Forest Stands ◽  
Black Coal ◽  
Potential Capacity ◽  
Functional Efficiency ◽  
Forest Functions ◽  
Anthropogenic Substrates ◽  
Hygienic Function ◽  
Functional Capacities

The functional efficiency of forest stands planted on the heaps originated by black coal mining was resolved in the territory of the Moravian-Silesian region. The aim was to verify the possibility of applying the method of Quantification of Social Forest Functions for the purposes of evaluation of forest stands on anthropogenic substrates and the subsequent use of the method for quantification of social forest functions in the particular reclaimed localities. Potential functional capacities were evaluated as well as the current functional effect of the following functions: bioproduction, ecological, hydrological, soil-conservation, recreational and sanitary-hygienic on five afforested heaps of the Ostrava-Karvina coal-mining district. The obtained results were presented in tabular and graphic form. Based on the results, the highest potential capacity of the ex-amined stands to fulfil the sanitary-hygienic function was proved while their capacity to fulfil the recreational function was the lowest. The highest current functional effects were found for the hydrological function and the lowest effects for the bioproduction function.  

scholarly journals Directional Hydraulic Fracturing (DHF) of the Roof, as an Element of Rock Burst Prevention in the Light of Underground Observations and Numerical Modelling

Energies ◽  
2021 ◽  
Vol 14 (3) ◽  
pp. 562
Author(s):  
Marek Jendryś ◽  
Andrzej Hadam ◽  
Mateusz Ćwiękała
Keyword(s):  
Rock Mass ◽  
Hydraulic Fracturing ◽  
Coal Mining ◽  
Rock Burst ◽  
Coal Mine ◽  
Seismic Activity ◽  
Black Coal ◽  
Directional Hydraulic Fracturing ◽  
Before And After ◽  
The Face

The following article analyzes the effectiveness of directional hydraulic fracturing (DHF) as a method of rock burst prevention, used in black coal mining with a longwall system. In order to define changes in seismic activity due to DHF at the “Rydułtowy” Black Coal Mine (Upper Silesia, Poland), observations were made regarding the seismic activity of the rock mass during coal mining with a longwall system using roof layers collapse. The seismic activity was recorded in the area of the longwall itself, where, on a part of the runway, the rock mass was expanded before the face of the wall by interrupting the continuity of the rock layers using DHF. The following article presents measurements in the form of the number and the shock energy in the area of the observed longwall, which took place before and after the use of DHF. The second part of the article unveils the results of numerical modeling using the discrete element method, allowing to track the formation of goafs for the variant that does not take DHF into consideration, as well as with modeled fractures tracing DHF carried out in accordance with the technology used at “Rydułtowy” coal mine.

Groundwater chemical characteristics and circulation mode in the Suixiao coal-mining district

2019 ◽  
Vol 53 (2) ◽  
pp. 227-235
Author(s):  
Yanxian Liu ◽  
Luwang Chen ◽  
Yudi He ◽  
Lanting Wang ◽  
Jie Zhang ◽  
...  
Keyword(s):  
Coal Mining ◽  
Chemical Characteristics ◽  
Mining District ◽  
Circulation Mode

The Structural Analysis of Deep Gas Occurrence and Prevention of Gas Disaster in Fengfeng Coalfield

2013 ◽  
Vol 734-737 ◽  
pp. 484-487 ◽  
Author(s):  
Mei Hua Geng ◽  
Xiu Jiang Lv ◽  
Xiao Gang Zhang
Keyword(s):  
Coal Seam ◽  
Coal Mining ◽  
Major Effect ◽  
Geological Structure ◽  
Mining District ◽  
Deep Mining ◽  
Theoretical Support ◽  
Gas Occurrence ◽  
Gas Disaster ◽  
Fault Structures

The geological structure is an important factor of gas occurrence in coal seam, and the gas occurrence in deep coal seam should be paid attention to enough because the occurrence was more controlled by geological structure and influence. Taken Fengfeng coalfield as target in this paper, the geological structure of this coalfield was described. The deep coal mining district which is monoclinic structure in Fengfeng is located in the east of Gushan anticlinoria, which the junior small anticlines and synclines of the sub-echelon are well developed. And regional fault structures are intensive, the pressure structure is the major structure among this region. The characteristics of geological structure in Fengfeng coalfield were analyzed. The tensional structure planes and pressure structure are the major effect factors, and the latter is the main form of gas occurrence in deep. Some suggestions on safe of deep mining in high gas environment is also put forward, in order to provide theoretical support for the deep coal mining and gas disaster prevention.

Hydrogeochemical characteristics and water quality assessment of shallow groundwater: a case study from Linhuan coal-mining district in northern Anhui Province, China

2019 ◽  
Vol 19 (5) ◽  
pp. 1572-1578 ◽  
Author(s):  
Huili Qiu ◽  
Herong Gui ◽  
Lin Cui ◽  
Zhenggao Pan ◽  
Biao Lu
Keyword(s):  
Water Quality ◽  
Coal Mining ◽  
High Salinity ◽  
Atmospheric Precipitation ◽  
Shallow Groundwater ◽  
Water Quality Assessment ◽  
Anhui Province ◽  
Mining District ◽  
Major Ion ◽  
Groundwater Samples

Abstract Major ion and trace element concentrations in shallow groundwater of Linhuan coal-mining district, Northern Anhui Province, China, were analyzed to determine its hydrogeochemical characteristics and to assess drinking and irrigation water quality. The relative abundance of cations and anions was Na+ > Mg2+ > Ca2+ > K+, and HCO3− > SO42− > Cl− > NO3−, respectively. The concentrations of Na+, HCO3−, NO3−, and total dissolved solids (TDS), and the electric conductivity (EC) values in some samples were higher than the permissible limits of the Water Health Organization (WHO). Gibbs diagrams showed that rock weathering mainly controlled the major ion chemistry of the groundwater, and the first aquifer of this study area had a weak hydraulic connection with atmospheric precipitation. The calculated sodium percentage (%Na) and sodium adsorption ratio (SAR) revealed that the slight sodium and high salinity hazards needed to be controlled before irrigation. According to the fuzzy comprehensive assessment, the groundwater samples were classified into four categories. The results showed that 92.86% of the groundwater samples were suitable for drinking use. For human health, the NO3− and Mn levels in the groundwater should be reduced before drinking, and treatment of the high salinity hazards is required before irrigation.

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