scholarly journals Analysis of Gas-Geodynamic Phenomena During the Preparatory and Mining Works in Seam 358/1 at KWK “Budryk”

2020 ◽  
Vol 3 (1) ◽  
pp. 131-148
Author(s):  
Marian Zmarzły ◽  
Michał Schubert ◽  
Krystian Salamon
Keyword(s):  
Coal Seam ◽  
Bearing Capacity ◽  
Preventive Measures ◽  
Complete Elimination ◽  
Legal Requirements ◽  
Mining Works ◽  
Ongoing Monitoring

AbstractThe nature of gas-geodynamic phenomena is so complicated and unpredictable that it forces the necessity of continuous search for new principles of identifying the outburst threat and ongoing monitoring of this threat with view of current conditions in the mine. After the incidents in JSW S.A, the mines carrying out works in seams threatened with outbursts, upon their own initiative introduced additional rigours and increased the frequency of measurements and tests regardless of the existing legal requirements. Incidents that have taken place in KWK “Budryk” in recent years show how important is continuous verification of knowledge related to the forecasting of the outburst threat on the basis of ongoing observations of works. The local occurrence of a zone characterized by high methane-bearing capacity in the coal seam, even after taking preventive measures and introducing additional rigorous did not allow for the complete elimination of gas-geodynamic phenomena and avoidance of danger to employed people.

scholarly journals Analysis of the Scale of Methane Hazard in Polish Hard Coal Mines

2018 ◽  
Vol 1 (1) ◽  
pp. 801-807 ◽  
Author(s):  
Magdalena Tutak
Keyword(s):  
Bearing Capacity ◽  
Natural Environment ◽  
Preventive Measures ◽  
Coal Mines ◽  
Mining Industry ◽  
Vital Role ◽  
Hard Coal ◽  
Explosive Mixture ◽  
Methane Extraction ◽  
Methane Mixture

Abstract In the majority of Polish mines, the exploitation of hard coal is accompanied by the release of considerable amounts of methane. Being flammable and explosive, methane may form an explosive mixture with air once it appears in mine workings. For this reason, the methane hazard is recognised as one of the ventilation risks in the mining industry. This process leads to the formation of air and methane mixture, whose considerable amounts permeate into the atmosphere and the natural environment. This phenomenon is extremely unfavourable because methane is, besides carbon dioxide, yet another gas that exacerbates the greenhouse effect. For this reason, it is increasingly more common to equip mines with methane collection systems in the process of demethylation. These play a vital role for both the natural environment and the safety of work in mines. A reduction of the methane content in headings increases the safety of the working crew and enhances the effectiveness of mining production. The article presents an analysis of the methane-related hazard based on methane emissions during mining exploitation. The analysis was based on the data concerning the amount of methane emitted into the atmosphere and collected by methane extraction systems from 16 coal mines. It led to identification of homogenous mines with similar values of the absolute methane-bearing capacity and ventilation methane-bearing capacity as well as with similar amounts of methane collected by methane extraction systems. The analysis was performed using the non-hierarchical k-average method, which belongs to the group of algorithms for analysing clusters. As a result, the mines were divided into the assumed number of groups. The results obtained made it possible to determine a group of mines in which, in the Author’s opinion, similar systems can be applied for controlling and reducing the methane hazard. These results also open up numerous possibilities for undertaking joint business ventures by the mines in terms of using the collected methane and implementing preventive measures.

The Study of Calculation Methods for Foundation Sedimentation

2011 ◽  
Vol 71-78 ◽  
pp. 3229-3232
Author(s):  
Wei He ◽  
Rong He ◽  
Feng Hu
Keyword(s):  
Bearing Capacity ◽  
Calculation Method ◽  
Preventive Measures ◽  
Calculation Methods ◽  
Excessive Pressure ◽  
Foundation Soil ◽  
Type Distribution ◽  
Building Loads

The soil under foundation of building deformed by the top load of which the value depended on not only the size and distribution of building loads, but also the type, distribution, and compression character of foundation soil. If the excessive pressure overloaded the foundation bearing capacity, the foundation would loss stability and breakage. Uneven foundation sedimentation will make the upper building crack. Therefore, the calculation method for foundation sedimentation is very important to guarantee the safety of buildings. In this paper, the calculation theories and methods for foundation sedimentation were compared and the relative preventive measures of disaster were illustrated.

Anti-Overturning Stability Numerical Analysis of Single Column Bridge

2012 ◽  
Vol 238 ◽  
pp. 705-708
Author(s):  
Xian Min Zhang ◽  
Bin Dong
Keyword(s):  
Numerical Analysis ◽  
Bearing Capacity ◽  
Preventive Measures ◽  
Single Column ◽  
Overturning Stability ◽  
Major Factors

Anti-overturning stability numerical analysis of a concrete single column bridge is introduced in this paper. The bearing capacity of the bridge is calculated under the condition of the bearings disengaging. The major factors making the bridge overturn are analyzed, and the preventive measures are given out. The results provide reference for the design of similar projects and driving demand.

scholarly journals Results of epizootological monitoring of African swine fever in the Altai Krai

2021 ◽  
Vol 36 ◽  
pp. 06037
Author(s):  
Valentina Razumovskaya ◽  
Nadezhda Lunyova ◽  
Olga Kronevald ◽  
Petr Barychnikov
Keyword(s):  
Laboratory Tests ◽  
Preventive Measures ◽  
Raw Materials ◽  
African Swine Fever ◽  
Complete Elimination ◽  
Veterinary Service ◽  
Viral Infectious Disease ◽  
Preventive Work ◽  
The Russian Federation ◽  
Great Damage

African swine fever (ASF) is a particularly dangerous viral infectious disease causing great damage to pig breeding due to high contagiousness, lethality and need for complete elimination of infected and healthy pigs in the epizootic focus and the threatened zone. The article describes the data on epizootic monitoring of ASF in the Altai Krai for the last nine years. The current legislative acts on the basis of which measures are taken to combat and prevent the disease are presented. The results of laboratory tests for the presence of the ASF pathogen of biological material, plant feed, raw materials and finished products of pig breeding imported from other entities of the Russian Federation are presented. The main preventive measures against carrying ASF carried out by the veterinary service are described. Thanks to the comprehensive preventive work of the veterinary service, the Altai Krai remains a prosperous region for ASF.

scholarly journals The influence of distant coal seam edges on seismic hazard during longwall mining

2020 ◽  
Author(s):  
Łukasz Wojtecki ◽  
Iwona Gołda ◽  
Maciej J. Mendecki
Keyword(s):  
Coal Seam ◽  
Longwall Mining ◽  
Mining Area ◽  
Simultaneous Increase ◽  
Coal Seams ◽  
Upper Silesian Coal Basin ◽  
Longwall Panel ◽  
Mining Works ◽  
Seam Mining ◽  
Mining Tremors

Abstract Underground coal seam mining has been carried out in the Upper Silesian Coal Basin, Poland, for many years and with a simultaneous increase in exploitation depth. Frequently, coal seams are not fully extracted due to numerous reasons which lead to their edges and remnants remaining in the rock mass. Even in the case of the full extraction of a coal seam, mining usually ends at the border of a protecting pillar to protect underground or surface objects, sometimes at the border of the mining area, or some distance from the old goaf or high throw fault. Extraction of subsequent coal seams in an analogous range results in a cluster of coal seam edges remaining. In the vicinity of the mentioned remainders, the disrupted stress distribution is expected. The infraction of the aforementioned equilibrium repeatedly results in the occurrence of strong mining tremors. The observations from the studied coal seam no. 408’s longwall panel indicated that mining works are able to disturb the present stress-strain equilibrium in the area of the edges of other coal seams, even if they are located at a greater vertical distance away. The seismological parameters and distributions have been applied for this purpose.

scholarly journals Determination of the Parameters of Geomechanical Stress Undulation Along the Length of a Face

2019 ◽  
Vol 105 ◽  
pp. 01045
Author(s):  
Maksim Shinkevich ◽  
Leonid Shevchenko ◽  
Valery Grishin
Keyword(s):  
Coal Seam ◽  
Bearing Capacity ◽  
Coal Mining ◽  
Rock Pressure ◽  
Capacity Planning ◽  
Pressure Effect ◽  
Accurate Calculation ◽  
Powered Support ◽  
Working Bodies

The use of the mass structuring flowchart will make it possible to forecast the methane release when mining a coal seam, to determine in advance and reasonably areas of increased rock pressure on a coal seam and a powered support. It will allow forecasting the areas of the negative rock pressure effect along the length of a face, increasing coal mining performance due to a more accurate calculation of the load on a stope and the cutting machinery output, correcting the force of the working bodies of cutting machines when destructing a coal seam, selecting face supports according to their bearing capacity, planning measures to eliminate the negative rock pressure effect in these areas, strengthen a selvedge to reduce the visible coal sloughing. Coal mining performance and safety will increase.

scholarly journals Polymer Drilling Fluid with Micron-Grade Cenosphere for Deep Coal Seam

2015 ◽  
Vol 2015 ◽  
pp. 1-9 ◽  
Author(s):  
Peng Xu ◽  
Han-qiao Xiong ◽  
Xiao-lin Pu ◽  
Ju-quan Liu ◽  
Xing Liu
Keyword(s):  
Coal Seam ◽  
Bearing Capacity ◽  
Performance Test ◽  
Drilling Fluid ◽  
New Thought ◽  
Free System ◽  
Existing Problems ◽  
Filtration Loss ◽  
Shallow Coal Seam ◽  
Reservoir Protection

Traditional shallow coal seam uses clean water, solid-free system, and foam system as drilling fluid, while they are not suitable for deep coal seam drilling due to mismatching density, insufficient bearing capacity, and poor reservoir protection effect. According to the existing problems of drilling fluid, micron-grade cenosphere with high bearing capacity and ultralow true density is selected as density regulator; it, together with polymer “XC + CMC” and some other auxiliary agents, is jointly used to build micron-grade polymer drilling fluid with cenosphere which is suitable for deep coal seam. Basic performance test shows that the drilling fluid has good rheological property, low filtration loss, good density adjustability, shear thinning, and thixotropy; besides, drilling fluid flow is in line with the power law rheological model. Compared with traditional drilling fluid, dispersion stability basically does not change within 26 h; settlement stability evaluated with two methods only shows a small amount of change; permeability recovery rate evaluated with Qinshui Basin deep coal seam core exceeds 80%. Polymer drilling fluid with cenosphere provides a new thought to solve the problem of drilling fluid density and pressure for deep coal seam drilling and also effectively improves the performance of reservoir protection ability.

Abstract #500: Osteoporosis Preventive Measures in Patients Receiving Glucocorticoids - are they Being Practiced?

2015 ◽  
Vol 21 ◽  
pp. 97
Author(s):  
Nitika Malhotra ◽  
Reem Alnazawi ◽  
Ved Gossain ◽  
Matthew Hebdon
Keyword(s):  
Preventive Measures

Fatality of Suicide Attempts in Amsterdam 1996–2005

Crisis ◽  
2009 ◽  
Vol 30 (4) ◽  
pp. 180-185 ◽  
Author(s):  
Evertjan Jansen ◽  
Marcel C.A. Buster ◽  
Annemarie L. Zuur ◽  
Cees Das
Keyword(s):  
Health Service ◽  
Time Trends ◽  
Suicide Attempts ◽  
Preventive Measures ◽  
Case Fatality ◽  
Absolute Number ◽  
Demographic Differences ◽  
Demographic Groups ◽  
Wish To Die ◽  
Municipal Health

Background: According to recent figures, Amsterdam is the municipality with the highest absolute number of suicides and the second highest suicide rate in the Netherlands. Aims: The aim of the study was to identify time trends and demographic differences in the occurrence of nonfatal suicide attempts versus suicides. Methods: We used registrations of forensic physicians and ambulance services of the Municipal Health Service of Amsterdam to study 1,004 suicides and 6,166 nonfatal attempts occurring in Amsterdam over the period 1996–2005. Results: The number of nonfatal attempts declined from 1996 to 2005, but the number of completed suicides remained relatively stable. Although case fatality was strongly associated with method used, we also found higher case fatalities for men and older people independent of method. Conclusions: The case fatality results suggest differences in motive among different demographic groups: possibly the wish to die is stronger among men and elderly. This finding had implications for the success to be expected from different preventive measures.

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