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Safety of Steel Arch Support Operation During Rock Bursts Under Explosive Atmosphere Conditions

Andrzej Pytlik

Andrzej Pytlik

Główny Instytut Górnictwa: Glowny Instytut GornictwaKatowice, Poland
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Pytlik, Andrzej
 y 
Witold Frąc

Witold Frąc

Główny Instytut Górnictwa: Glowny Instytut GornictwaKatowice, Poland
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Frąc, Witold
  
17 mar 2023
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Categoría del artículo: Research Article
Publicado en línea: 17 mar 2023
Páginas: 144 - 157
Recibido: 24 sept 2021
Aceptado: 05 ene 2023
DOI: https://doi.org/10.2478/sgem-2023-0004
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© 2023 Andrzej Pytlik et al., published by Sciendo
This work is licensed under the Creative Commons Attribution 4.0 International License.

Figure 1

Setup for testing straight and arching sliding joints (a) and picture of the test facility with an SV prop constructed from V32 sections (b).
Setup for testing straight and arching sliding joints (a) and picture of the test facility with an SV prop constructed from V32 sections (b).

Figure 2

Inspecting the emissivity e of the steel used to construct the V32 sections: (a) picture of the dryer with the sections; (b) thermal image.
Inspecting the emissivity e of the steel used to construct the V32 sections: (a) picture of the dryer with the sections; (b) thermal image.

Figure 3

Courses of sliding joint static load capacity Fs: (a) SV32 – two SDO32W shackles, Md = 450 N m; (b) SV32t – three SDO32W shackles, Md = 500 N m.
Courses of sliding joint static load capacity Fs: (a) SV32 – two SDO32W shackles, Md = 450 N m; (b) SV32t – three SDO32W shackles, Md = 500 N m.

Figure 4

Pictures of sliding joints in an SV32t prop (three shackles in the joint).
Pictures of sliding joints in an SV32t prop (three shackles in the joint).

Figure 5

Course of joint force and maximum temperature at an impact velocity vp = 2.05 m/s (a) and joint thermal image (b).
Course of joint force and maximum temperature at an impact velocity vp = 2.05 m/s (a) and joint thermal image (b).

Figure 6

Course of joint force and maximum temperature at an impact velocity vp = 2.45 m/s (a) and joint thermal image (b).
Course of joint force and maximum temperature at an impact velocity vp = 2.45 m/s (a) and joint thermal image (b).

Figure 7

Course of joint force and maximum temperature at an impact velocity vp = 2.79 m/s (a) and joint thermal image (b).
Course of joint force and maximum temperature at an impact velocity vp = 2.79 m/s (a) and joint thermal image (b).

Figure 8

Arching sliding joint (a, c), course of joint force and maximum temperature at an impact velocity vp = 0.55 m/s (b), and joint thermal image (d).
Arching sliding joint (a, c), course of joint force and maximum temperature at an impact velocity vp = 0.55 m/s (b), and joint thermal image (d).

Figure 9

Course of joint force and maximum temperature at an impact velocity vp = 2.05 m/s (a), picture of an arching joint (b), and joint thermal image (c).
Course of joint force and maximum temperature at an impact velocity vp = 2.05 m/s (a), picture of an arching joint (b), and joint thermal image (c).

Figure 10

SV32tw friction prop with four shackles: three shackles in the joint and one restraining shackle under the joint.
SV32tw friction prop with four shackles: three shackles in the joint and one restraining shackle under the joint.

Figure 11

Course of joint force and maximum temperature at an impact velocity vp = 2.05 m/s (a) and joint thermal image (b). 3 – lower shackle; 4 – restraining shackle.
Course of joint force and maximum temperature at an impact velocity vp = 2.05 m/s (a) and joint thermal image (b). 3 – lower shackle; 4 – restraining shackle.

Result compilation of SV32t straight sliding joint tests under dynamic loading_

Test no. vp, m/s z, m Ec, J Nd, kN Tmax, °C
1 2.05 140 25,556 183 169.6
2 110 23,387 213
3 95 33,256 235
4 2.45 155 33,256 215 175.5
5 160 33,617 210
6 150 45,293 219
7 2.79 230 45,293 197 234.1
8 205 43,485 212
9 205 43,485 212
Average 211
Standard deviation 14
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Inglés
Calendario de la edición:
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Temas de la revista:
Geociencias, Geociencias, otros, Ciencia de los materiales, Compuestos, Materiales porosos, Física, Mecánica y dinámica de fluidos
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