The concept of modification and analysis of the strength of steel roadway supports for coal mines in the Soma Basin in Turkey

Marek Grodzicki; Marek Rotkegel

doi:10.2478/sgem-2018-0006

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The concept of modification and analysis of the strength of steel roadway supports for coal mines in the Soma Basin in Turkey

Studia Geotechnica et Mechanica

Volume 40 (2018): Issue 1 (July 2018)

By: Marek Grodzicki and Marek Rotkegel

Open Access

|Jun 2018

Figures & Tables

Location of the Soma basin (Google Maps).

The shape of the frame and basic geometrical parameters.

The proposed outline of the frame of approximately 20 m2.

The map of reduced stresses in the A (left) and B and C (right) frames for load scheme I (qs = 0.1 MN/m, stresses in Pa, deformation scale 10×).

The map of reduced stresses in the A (left) and B and C (right) frames for load scheme II (qs = 0.1 MN/m, stresses in Pa, deformation scale 10×).

The map of reduced stresses in the A (left) and B and C (right) frames for load scheme III (qs = 0.1 MN/m, stresses in Pa, deformation scale 10×).

Comparison of maximum stresses in arch support A and B and C for different load patterns.

Map of reduced stresses in A (left), B (middle) and C (right) frames for load scheme – variant I (stresses in Pa, deformation scale 10×).

Map of reduced stresses in A (left), B (middle) and C (right) frames for load scheme – variant II (stresses in Pa, deformation scale 10×).

Map of reduced stresses in A (left), B (middle) and C (right) frames for load scheme – variant III (stresses in Pa, deformation scale 10×).

Comparison of the maximum load capacity of arch support A, B and C for different load patterns.

Cross-sectional mechanical parameters of V36 profile

Profile	A	H	B	e	l_X	l_Y	W_X	W_Y	e_pl	W_plX	m	σ_dop25G2	σ_dopS480W	σ_dopS550W

	cm²	mm	mm	mm	cm⁴	cm⁴	cm³	cm³	mm	cm³	–	MPa	MPa	MPa
V36	45.16	138	171	65.68	923	1229	127.64	143.74	61.57	185.72	1.455	612	694	784

Material plasticising coefficient

Steel grades	n
25G2; 31Mn4 (R_e = 340 MPa, R_m = 550 MPa)	0.6176
S480W (R_e = 480 MPa, R_m = 650MPa)	0.3542
S550W (R_e = 550 MPa, R_m = 730 MPa)	0.3273

Maximum stress values in the analysed arch supports

Model designation	Load scheme

	I	II	III
	(q_s = 0.1 MN/m	(q_s=0.1 MN/m	(q_s = 0.1 MN/m
	+ resist the side wall)	+ no side wall resistance)	+ q_o = 0.05 MN/m)
A (current V36, S480W)	S_max = 310.7 MPa	S_max = 609.1 MPa	S_max = 327.3 MPa
B (proposed V36, S480W) C (proposed V36, S550W)	S_max = 268.2 MPa	S_max = 578.3 Mpa	S_max = 262.6 Mpa

Material factor γs_

Steel grades	Y_s	R_{e min}. (MPa)	R_{m min}. (MPa)
25G2; 31Mn4	1.15	340	550
S480W	1.25	480	650
S550W	1.25	550	730

Models analysed_

Model designation	Arch support	Section	Steel grade
A	Current	V36	S480W
B	Proposed	V36	S480W
C	Proposed	V36	S550W

Maximum load values transmitted by the arch support_

Model designation	Load variant

	I (roof load + wall resistance)		II (roof load + no side wall resistance)		III (roof load + side load)
A (current V36, S480W)	F_max = 669 kN	100%	F_max = 342 kN	100%	F_max = 636 kN	100%
B (proposed V36, S480W)	F_max = 774 kN	115%	F_max = 360 kN	105%	F_max = 792 kN	124%
C (proposed V36, S550W)	F_max = 877 kN	131%	F_max = 407 kN	119%	F_max = 896 kN	140%

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DOI: https://doi.org/10.2478/sgem-2018-0006 | Journal eISSN: 2083-831X | Journal ISSN: 0137-6365

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Language: English

Page range: 38 - 45

Submitted on: Jan 12, 2018

Accepted on: Mar 23, 2018

Published on: Jun 11, 2018

Published by: Wroclaw University of Science and Technology

In partnership with: Paradigm Publishing Services

Publication frequency: 4 issues per year

Keywords:

Related subjects:

Physics,

Mechanics and fluid dynamics

© 2018 Marek Grodzicki, Marek Rotkegel, published by Wroclaw University of Science and Technology
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

Volume 40 (2018): Issue 1 (July 2018)

The concept of modification and analysis of the strength of steel roadway supports for coal mines in the Soma Basin in Turkey

Figures & Tables

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Figure 15

Cross-sectional mechanical parameters of V36 profile

Material plasticising coefficient

Maximum stress values in the analysed arch supports

Material factor γs_

Models analysed_

Maximum load values transmitted by the arch support_

Paradigm

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