CONTENTS
UDC: 622.815.001.51:622.333:622.016.34:622.031
Kidybiński A.
Dynamics of coal and methane outburst in roadway heading within coal seam of homogenous structure –- on the basis
of particle fl ow model testing.
Prz. Gór. 2007, Vol. 63, No.11, pp. 2÷10, 11 Figs, 6 Refs.
Coal and gas outbursts. Coal entry. Gas pressure in coal solid. Strain energy. Model testing.
On the basis of particle fl ow model testing (PFC) of coal and methane outbursts in the coal mine such features as: macroporosity changes of
the coal seam ahead of roadway drivage, the share of sliding fraction (SF), horizontal displacement of coal particles, pressure of free gas fl
owing through coal solid and the share of desorbed gas as well, strain energy and kinetic energy of distressed part of the seam ahead of
drivage are discussed. Threshold (initial) values of solid phase concentration in coal/gas mixture as well as initial pressure starting the
outburst process within coal solid are given. The development (phases) of outburst process are discussed and conclusions concerning further
research given as well as underground measurements advised to the mines where hazard of coal and gas outbursts exists.
UDC: 622.838.69.059.22:622.834.53.519.2
Kwiatek J.
Effect of mining exploitation on expansion gaps between building objects.
Prz. Gór. 2007, Vol. 63, No.11, pp. 11÷15, 4 Figs, 4 Tables, 9 Refs.
Mining damage. Building prevention on mining areas. Expansion gaps between building objects.
Big length of building objects on mining areas is their disadvantages feature. Taking this into consideration the too long objects are divided
into independent constructional segments leaving expansion gaps between them. Determination required width of the gaps is an essential
problem. It refers also to separate objects located close to each other. The way of determination of the gap width changes caused by
underground mining, taking under consideration random spread of horizontal deformations and surface curvatures as well as mining depth
and assumed objects damage.
UDC: 622.273.23.004.15:622.285.2.003:622.12:625.083.3
Krauze K.
Analysis of longwall set of equipment parameters in aspect of daily output increasing.
Prz. Gór. 2007, Vol. 63, No.11, pp. 16÷20, 5 Figs, 1 Ref.
Mechanization of longwall operations. Longwall mining method. Parameters of mining machines. Longwall output. Investment
outlay.
Getting of positive accumulation in the process of underground hard coal mining by longwall method depends on many factors. Among them
technical outfi t of a longwall is the decisive one. Longwall technical equipment determines the daily output as well as investment cost and
next operating costs. Therefore the proper selection of particular machines and arrangements is so important to get assumed capacity and
quality of mined coal. In this connection analytical studies have been conducted for the selected longwall enabling determination of daily
output taking into consideration real possible organizational and technical variants. Required quality of coal and minimization of investment
costs have been taken into consideration in those studies.
UDC: 622.333:622.245.542.001/1:622.235.637.001.4/6:528.481
Myszkowski J.
Directed rock fracturing method. Part 3. Directed rock fracturing designing principles.
Prz. Gór. 2007, Vol. 63, No.11, pp. 21÷25, 5 Figs, 2 Refs.
Rock fracturing. Principles of execution. Designing of fracturing.
Conducted laboratory tests and study as well as a dozen or so years of experience gained running directed rock fracturing by UHS and USS
methods under operating conditions allowed to the paper these principles are given depending on the purpose they have to serve.
UDC: 622.17.001:622.333:661.054.8:669.162.275.2.004.8:669.5.004.8:625.072.001
Gruchot A.T, Zawisza E.
Compactibility and bearing capacity of selected coal rejects and scrap material.
Prz. Gór. 2007, Vol. 63, No.11, pp. 26÷30, 1 Figs, 3 Tables, 14 Refs.
Highway engineering. Utilization of waist material. Research on waist materials. Coal rejects. Blast furnace slag.
The paper includes results of tests of size composition, compactibility and bearing capacity index CBR of un-burnt coal rejects from KWK
(Hard coal mine) „Powstańców Śląskich”, blasting furnace slag from „Bobrek”, steel plant and zinc metallurgy slag from Metallurgy Plant at
Trzebinia. The analysis of tests results proved a signifi cant infl uence of compactibility intensity on increase of geo-technical parameters of
tested materials. It is essential in the aspect of their usefulness for highway engineering. Usefulness of tested industrial waste for this
purpose has been shown, but the most favourable geo-technical properties shows blast furnace slag.
UDC: 622.012.3:622.228:622.366(438):622.882:622.841:628.1.502.5
Haładus A.
Forecast of water quality in post-mining working Piaseczno near Tarnobrzeg.
Prz. Gór. 2007, Vol. 63, No.11, pp. 31÷36, 1 Figs, 2 Tables, 6 Refs.
Mine liquidation. Water reservoir. Hydro-chemical balance. Open cast mine.
To carry out liquidation of opencast sulphur mines at Machów and Piaseczno, in a way minimizing natural environment hazard, has been the
most important problem for Tarnobrzaeg region in the last years. Program of liquidation works assumed, that mining workings will be
replaced by recreation water reservoirs. Filling of Machów reservoir will be fi nished soon, but the works at Piaseczno reservoir are
considerably delayed. Forecasting of water quality changes in the reservoir Piaseczno has been based on results of simulations made on the
numerical hydro-geological model of the Tarnobrzeg Sulphur Basin. Solutions took into consideration various ways to limit infl ow polluted
waters from the Newer Tertiary stage into the reservoir. The hydro-geo-chemical balance was based on discharge of fi ltration streams as
well as concentrations of indicating ions (chlorides and sulfates). As well in the year 2006 as in the forecasts the biggest pollutants charge
is brought by fi ltration stream fl owing into the reservoir from the side of mine storage yards. Liquidation activity under partial or complete
isolation of the working will not cause the change of the general class of reservoir waters quality according to salinity indices. Sulfates will
still exceed twice the boundary value for the class IV, and only concentration of chlorides will be within class II.
Information.
24rd Convention of the Mining Engineers and Technicians Association.
Prz. Gór. 2007, Vol. 63, No 11, pp. 37÷38