scholarly journals PRACTICAL EXPERIENCE USING CEMENT MIXTURE DURING THE EXCAVATION OF THE MINE WORKINGS NO. 5053 ON THE MINING PLANT 1 WITHIN THE OKR (OSTRAVA-KARVINA COAL BASIN)

2011 ◽  
Author(s):  
Vaclav Zubicek
Keyword(s):  
Practical Experience ◽  
Coal Basin ◽  
Cement Mixture ◽  
Mine Workings ◽  
Mining Plant

Participation of Quaternary Aquifers in Groundwater Inflow to Mines in the Upper Silesian Coal Basin (USCB) / Udział Wodonośnych Utworów Czwartorzędowych W Procesie Zawodnienia Kopalń Górnośląskich

2015 ◽  
Vol 60 (1) ◽  
pp. 419-437
Author(s):  
Kazimierz Różkowski ◽  
Andrzej Różkowski ◽  
Marek Sołtysiak
Keyword(s):  
Ore Deposits ◽  
Open Pit ◽  
Hard Coal ◽  
Quaternary Sediments ◽  
Coal Basin ◽  
Groundwater Inflow ◽  
Technological Factors ◽  
Upper Silesian Coal Basin ◽  
Quaternary Aquifers ◽  
Mine Workings

Abstract The Upper Silesian Coal Basin (USCB) is situated within Variscean depression in the southern Poland. Mining of the hard coal, ore and sand deposits in the USCB has a long-lasting tradition. Exploitation has been carried out with both - open pit and mainly underground operations. The intensity of water inflows to mines depends on geogenic and technological factors. Among geogenic factors the main one is occurrence of thick water - bearing Quaternary sediments in the roof of Carboniferous ore deposits. Among technological factors the essential influence on the inflows to the mine workings have: time, depth and surface of exploitation, as well as drainage intensity.

scholarly journals Improvement of Safety for the Underground Vertical Workings

2021 ◽  
pp. 41-48
Author(s):  
O.E. Khomenko ◽  
◽  
M.N. Kononenko ◽  
V.I. Lyashenko ◽  
◽  
...  
Keyword(s):  
Practical Experience ◽  
Operating Conditions ◽  
Theory And Practice ◽  
Mining Operations ◽  
New Device ◽  
Deep Wells ◽  
Solid Media ◽  
Tunneling Machine ◽  
Mine Workings ◽  
The Republic

The main scientific and practical calculations used to increase the efficiency of vertical mine workings based on studying the operation of tunneling complexes and road-heading machines, as well as by sectional blasting of the deep wells are presented in the article. This will ensure high-quality mine workings in accordance with the design and improve the operational safety throughout the entire service life. The methods are used related to the complex generalization, analysis and assessment of the practical experience and scientific achievements in the field of the underground geotechnology, theory and practice of explosive destruction of the solid media, mechanics of continuous media, mathematical statistics, as well as studies of the wave processes according to the standard and new methods developed by the leading experts from the leading mining countries of the world, including with the authors participation. Technological audit of the vertical working drilling and blasting was conducted using KPV-4A tunneling complex and the tunneling machine Robbins 73R, as well as the efficiency of conducting them in the cycle of mining operations was established. Mathematical modeling and calculation of the parameters of drilling and blasting operations were carried out using the contour blasting of explosive charges when driving vertical mine workings. Rounder of RS-220 type for the hole boring was recommended (complete with machine tool NKR-100MPА) of the downward wells with a diameter of 220 mm in rocks with a coefficient of f = 8–14 according to the scale of M.M. Protodyakonov, which is already being used at the mines of Ukraine, Russia, the Republic of Kazakhstan, and other countries. The new device for the contactless transmission of electricity from the stationary object to a mobile one was proposed, which will allow to improve the operating conditions of KPV-4A tunneling complex, LMSh-1 mine type elevator used for lifting and lowering people, small equipment, and materials along the rise workings, which is achieved due to external location of the cable rewinding mechanism and the absence of complex, for example, planetary mechanisms. It will also improve the efficiency and safety of work for the vertical mine workings in the rock massifs.

Mine Pressure and Rock Displacement Temporal Variation Analysis for Jiu Valley Directional Drifts in the Context of “n” Stability Criterion/Analiza Ciśnień I Chwilowych Przemieszczeń Skał W Badaniach Kierunkowych Wyrobisk W Kopalniach W Dolinie Jiu Z Uwzględnieniem Kryterium Stabilności ‘N’

2014 ◽  
Vol 59 (2) ◽  
pp. 455-466
Author(s):  
Mihaela Toderaş ◽  
Roland Iosif Moraru
Keyword(s):  
Stability Criterion ◽  
Operating Conditions ◽  
Mine Pressure ◽  
Coal Basin ◽  
Systems Research ◽  
Metal Type ◽  
Operation Period ◽  
Mine Workings ◽  
The Stability ◽  
Pressure Regime

Abstract Ensuring mine workings stability over their entire operation period largely depends on the chosen support system and on their interaction with the surrounding rock. Looking at how the main horizontal mine workings are supported in Jiu Valley coal basin, we found that they fall into the category fulfilling a reinforcement role. From the data provided by the documentation of the collieries within this basin, it was found that there were generalized different metal - type supporting systems that with respect to operating and working mode are with constant or malleable strength and increasing - strength (rigid supporting systems). Research conducted on the stability analysis of horizontal mine workings aimed at elucidate the intensiveness and characteristics of mine pressure, the deformation character and contour displacement of rocks, the interplay between geo-mechanical deformation conditions and deformation extension, as good as the influence of these parameters on the supporting system’s behavior. This paper presents a methodology for determining the main laws of mine pressure regime distribution, the results of the burden load values and displacement of support, considering the “n” stability criterion as a complex parameter which can express the laws of variation, for the specific location and operating conditions of directional galleries within the floor of coal seam 3 in Jiu Valley.

scholarly journals A Proposal of Rock Burst Control Measures at the Coalface No. 1 4064 at the Mining Plant 1, in OKD, A. S. Czech Republic

2020 ◽  
Vol 1 (1) ◽  
Author(s):  
Václav ZUBÍČEK ◽  
Vlastimil HUDEČEK ◽  
Milan KUBICA
Keyword(s):  
Czech Republic ◽  
High Risk ◽  
Rock Burst ◽  
Stress Level ◽  
Rock Massif ◽  
Control Measures ◽  
Rock Bursts ◽  
Mine Workings ◽  
Mining Plant

The paper describes a proposal of rock burst control measures for excavation and mining of the area the Coalface No. 1 4064, which is located in the 1st mining block of the Mining Plant 1, locality Karviná. It is an area that has been left in place as a protective area for safety reasons due to the high risk of rock bursts, and it is bordered on both sides by old workings.The aim of the proposal is to extract the retained area by using rock burst control measures to reduce this risk. As a measure, extensive disintegration of the rock massif in the overlying rocks of the seam by blasting works was chosen, both in driving mine workings and in mining of the coalface.The article describes the methods and scope of implementation of active and passive rock burst control measures in standard situations and in the case of detection of an unfavourable stress level.

scholarly journals Experimental Studies about Characteristics of the Rocks Displacement and State of Bearing Pressure on the Haulage Roadway

2019 ◽  
Vol 105 ◽  
pp. 01008
Author(s):  
Duc Thang Pham ◽  
Hung Thang Hoang ◽  
Victor Vitcalov
Keyword(s):  
Rock Pressure ◽  
Roof Rock ◽  
Experimental Studies ◽  
Coal Seams ◽  
Coal Basin ◽  
Mining Depth ◽  
The Face ◽  
Mine Workings ◽  
Roof Rocks ◽  
Quang Ninh

Comprehensive studies were conducted using measuring stations to measure the rock pressure and displacements of the roof rocks in the mine workings adjacent to the face when extracting medium thick inclined coal seams with the use of longwall (seam 6 at the Quang Hanh mine of Quang Ninh coal basin, Vietnam). The results of the study show that the displacement of the roof rock on the parallel roadway increases sharply at a distance of 1 to 12 m to the face, varies from 20 to 40 mm when the mining depth of the coal seam is 200 m and the maximum rock pressure on the haulage roadway supports is located at a distance of 3–8 m ahead of the face and is from 14 to 16 tons ranges.

Interpolation and Sampling Errors of the Ash and Sulphur Contents in Selected Polish Bituminous Coal Deposit (Upper Silesian Coal Basin – USCB) / Błędy Interpolacji I Opróbowania Zawartości Popiołu I Siarki W Wytypowanych Polskich Złożach Węgla Kamiennego (Górnośląskie Zagłębie Węglowe)

2015 ◽  
Vol 60 (3) ◽  
pp. 791-806 ◽  
Author(s):  
Jacek Mucha ◽  
Monika Wasilewska-Błaszczyk
Keyword(s):  
Spatial Distribution ◽  
Sampling Error ◽  
Estimation Error ◽  
Random Component ◽  
Drill Core ◽  
Coal Basin ◽  
Core Sampling ◽  
Upper Silesian Coal Basin ◽  
Mine Workings ◽  
Analytical Errors

Abstract The basic sources of information on the parameters characterizing the quality of coal (i.e. its ash and sulphur contents) in the deposits of The Upper Silesian Coal Basin (Poland) are drill core sampling (the first stage of exploration) and channel sampling in mine workings (the second stage of exploration). Boreholes are irregularly spaced but provide relatively uniform coverage over an entire deposit area. Channel samples are taken regularly in mine workings, but only in the developed parts of the deposit. The present study considers selected seams of two mines. The methodology used is based on detailed geostatistical analysis, point kriging procedure and P. Gy’s theory of sampling. Its purpose is: • defining and comparing geostatistical models for variability of the ash and sulphur contents for data originating from boreholes and mine workings, • predicting by means of point kriging the values of the parameters and errors of interpolation using data from boreholes at grid points where underground mine workings were later channel-sampled, • assessing the accuracy of interpolation by comparison of predicted values of parameters with real values (found by channel sampling), • evaluating the variances of total secondary sampling error (error of preparation of assay samples) and analytical error introduced by assaying of sulphur and ash, • assessing the contribution of sampling and analytical errors (global estimation error) to the interpolation errors. The authors found that the interpolation errors for ash or sulphur content are very large, with mean relative values of 35%-60%, mainly caused by the considerable natural variability, a significant role of random component of variability, and heterogeneity of spatial distribution of these characteristics. The sampling and analytical errors play a negligible role. Their values are smaller than 11% of interpolation error values. Presenting estimates of the spatial distribution of ash and sulphur contents in coal seams by means of contour maps is unreasonable if they are based on drill core sampling.

The Fundamentals of the Clinical Fellowship Experience

2016 ◽  
Vol 1 (11) ◽  
pp. 81-85
Author(s):  
Melanie Hudson
Keyword(s):  
Growth And Development ◽  
Transition Period ◽  
Clinical Skills ◽  
Practical Experience ◽  
Professional Experience ◽  
New Graduate ◽  
Independent Practitioner

The Clinical Fellowship Experience is described by the American Speech-Hearing-Language Association (ASHA) as the transition period from constant supervision to independent practitioner. It is typically the first paid professional experience for the new graduate, and may be in a setting with which the new clinician has little or even no significant practical experience. The mentor of a clinical fellow (CF) plays an important role in supporting the growth and development of this new professional in areas that extend beyond application of clinical skills and knowledge. This article discusses how the mentor may provide this support within a framework that facilitates the path to clinical independence.

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