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Powered Roof Support – Rock Strata Interactions on the Example of an Automated Coal Plough System

Łukasz Herezy
Łukasz Herezy
, 
Dariusz Janik
Dariusz Janik
 und 
Krzysztof Skrzypkowski
Krzysztof Skrzypkowski
   | 04. Juni 2018
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Article Category: Research Article
Online veröffentlicht: 04. Juni 2018
Seitenbereich: 46 - 55
Eingereicht: 06. Jan. 2018
Akzeptiert: 23. März 2018
DOI: https://doi.org/10.2478/sgem-2018-0007
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© 2018 Łukasz Herezy et al., published by Sciendo
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

Figure 1

Pressure ranges in the powered supports Source: Author’s own sources.
Pressure ranges in the powered supports Source: Author’s own sources.

Figure 2

Predicted operating pressure pr of the plough support Source: Author’s own sources.
Predicted operating pressure pr of the plough support Source: Author’s own sources.

Figure 3

Function governing the formation of the first cracks ahead of an active face.Source: Based on Drzewiecki 1995.
Function governing the formation of the first cracks ahead of an active face.Source: Based on Drzewiecki 1995.

Figure 4

Screenshot from V-Shield.Source: Author’s own sources.
Screenshot from V-Shield.Source: Author’s own sources.

Figure 5

Shield leg pressure variations – case 1.Source: Author’s own sources.
Shield leg pressure variations – case 1.Source: Author’s own sources.

Figure 6

Shield leg pressure variations – case 2.Source: Author’s own sources.
Shield leg pressure variations – case 2.Source: Author’s own sources.

Figure 7

Correlating the real pressure increase in a leg with that predicted based on an exponential function.Source: Author’s own sources.
Correlating the real pressure increase in a leg with that predicted based on an exponential function.Source: Author’s own sources.

Operating parameters of a powered roof support.

Unit numberFig. 5Fig. 6
Control systemShield arrangement with respect to the longwall faceCutting depth z [m]Rate of face advance [m/day]Control systemShield arrangement with respect to the longwall faceCutting depth z [m]Rate of face advance [m/day]
8ManualLinear0.0616.00AutomaticSaw tooth0.0320.00
25ManualLinear0.05ManualLinear0.05
70AutomaticSaw tooth0.04AutomaticSaw tooth0.1
115ManualLinear0.05AutomaticSaw tooth0.15
134ManualLinear0.05AutomaticSaw tooth0.04

Statistical significance of model parameters.

EffectParameter evaluation: z sigma parameterisation with constraints
Acceptance condition: pmin≥24 MPa, pmax≤42 MPa, tp≤30 min
Leg pressure factorLeg pressure, Standard errorLeg pressure, t-valueLeg pressure, p-value-95,00% Confide. Interval+95,00% Confide. IntervalLeg pressure, Beta (β)Leg pressure, Error beta (β)-95,00% Confide. Interval+95,00% Confide. Interval
Free term24.610.12195.920.0024.3724.86
Roof barring factor6.750.0977.650.006.586.920.310.0040.300.32
Rate of face advance factor0.020.0035.890.000.010.020.020.010.010.02
Compressive strength of roof strata factor-0.060.01-18.910.00-0.06-0.05-0.060.01-0.07-0.06
Standstill time of a support unit factor0.090.0169.920.000.090.090.280.010.270.28
Parameter evaluation: z sigma parameterisation with constraints
Acceptance condition:: pmin≥24 MPa, pmax≤42 MPa, tp≤60 min
Free term25.130.11213.210.0024.9025.36
Roof barring factor7.070.0793.720.006.927.210.310.010.300.32
Rate of face advance factor0.010.015.590.000.010.020.010.010.010.02
Compressive strength of roof strata factor-0.070.01-25.440.00-0.08-0.07-0.080.01-0.08-0.07
Standstill time of a support unit factor0.070.00103.100.000.070.070.340.010.340.35
Parameter evaluation: z sigma parameterisation with constraints
Acceptance condition:: pmin≥24 MPa, pmax≤42 MPa, tp≤250 min
Free term24.792.898.560.0019.0830.51
Roof barring factor-0.093.23-0.030.97-6.486.28-0.010.07-0.140.14
Rate of face advance factor0.280.054.980.000.170.390.350.070.210.48
Compressive strength of roof strata factor0.110.061.690.09-0.020.230.120.07-0.020.27
Standstill time of a support unit factor0.020.014.210.000.010.030.320.070.170.47

Operating parameters of powered roof support (shield) sections.

ParametersValueUnit
Shield height range0.95–2.0m
Operating range1.0–1.9m
Admissible inclinationLongitudinaldo 15°-
Lateral± 15°-
Pitch1.75m
Stepto 0.85m
Number of legs2pcs.
Leg diameterØ320mm
Bearing capacity of the legSet (32 MPa)2.573MN
Yield (45 MPa)3.619MN
Canopy4,030mm
Yield pressure45MPa
Supply pressure32MPa
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