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

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

Studia Geotechnica et Mechanica

Volume 45 (2023): Issue 2 (June 2023)

By: Andrzej Pytlik and Witold Frąc

Open Access

|Mar 2023

Figures & Tables

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

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

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.

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

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 = 2.45 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).

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).

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).

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

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.	v_p, m/s	z, m	E_c, J	N_d, kN	T_max, °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

DOI: https://doi.org/10.2478/sgem-2023-0004 | Journal eISSN: 2083-831X | Journal ISSN: 0137-6365

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Language: English

Page range: 144 - 157

Submitted on: Sep 24, 2021

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Accepted on: Jan 5, 2023

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Published on: Mar 17, 2023

Published by: Wroclaw University of Science and Technology

In partnership with: Paradigm Publishing Services

Publication frequency: 4 issues per year

Keywords:

arching support sliding joints,

straight prop sliding joints,

dynamic load capacity,

kinetic coefficient of friction,

thermal imaging

Related subjects:

Geosciences, other,

Materials sciences,

Porous materials,

Mechanics and fluid dynamics

© 2023 Andrzej Pytlik, Witold Frąc, published by Wroclaw University of Science and Technology
This work is licensed under the Creative Commons Attribution 4.0 License.

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