Behaviour of Frictional Joints in Steel Arch Yielding Supports

Horyl, Petr; Šňupárek, Richard; Maršálek, Pavel

doi:10.2478/amsc-2014-0054

Cited by 8 publications

(8 citation statements)

References 8 publications

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“…The diagram in figure 7,a demonstrates the dynamic of reciprocal segments friction for the pretension of the clamps' bolts to 300 MPa, whereas fragment (b) of this figure shows the diagram for the tightening of the bolts to 400 MPa, whereby the bolts transited to plastic state at the end of the experiment. The average level of the unbalance forces grew 1.46 times in the second case that corresponds to a common sense and matches the results of simulation by Horyl et al [29].…”

Section: Results Of Simulationsupporting

confidence: 89%

“…In recent times, computer simulation became popular to investigate YFS behavior although the problem of friction and reciprocal sliding of the frame segment remains unsolved [6,[27][28][29][30][31][32]. Horyl et al [28] simulated by finite element method (FEM) vibration of YFS due to its dynamic loading.…”

Section: Analysis Of the Yfs Resistance Oscillation Dynamicsmentioning

confidence: 99%

“…Horyl et al [28] simulated by finite element method (FEM) vibration of YFS due to its dynamic loading. Later, Horyl et al [29] managed to simulate explicit reciprocal sliding of the YFS segments and demonstrated by FEM that loading capacity of YFS is proportional to the friction coefficient. This simulation was carried out on a symmetrical half of the profile, and reciprocal sliding of the segments was quasi-static because the researchers did not mention dynamic oscillation of the YFS resistance.…”

Section: Analysis Of the Yfs Resistance Oscillation Dynamicsmentioning

confidence: 99%

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Dissipative structure suppression as a way to increase the sustainable improvement of the frame support bearing capacity

Nazimko¹,

Zakharova²,

Merzlikin

et al. 2022

IOP Conf. Ser.: Earth Environ. Sci.

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Introduction. A yield frame support is a basic means of providing the underground roadways’ stability in the deep mines operating in the hard ground control condition when the ratio of the ground pressure to the unconfined strength of surrounding rock mass exceeds 0.33. The operators adjust the nominal bearing capacity of the frames at 0.55 of their maximum or peak resistance Fmax because the frames operate in a dry friction mode spontaneously generating oscillation, which causes variation of the resistance in the range from 0.1 up to 0.9 of Fmax . Aim/tasks. We intended to reduce the dynamic oscillation of the support resistance that allows for increasing their bearing capacity. Methodology. We used a computer simulation by FLA3D model, indoor testing of the frames, and actual measurements in an underground coal mine. Results. We revealed a specific behavior of the frame support that reduced the limit of the bearing capacity by 45%. During yielding, the frames generate dissipative structures (DS) that become apparent due to the dynamic nature of stick-slip friction following the yielding process. We demonstrated that DS control and especially its suppression provides a sustainable increase in the frame bearing capacity. Conclusions. Improvement of the yield frames design and especially their clamps are the prospective way to control DS and provide sustainable enhancement of the frame bearing capacity.

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Section: Results Of Simulationsupporting

confidence: 89%

Section: Analysis Of the Yfs Resistance Oscillation Dynamicsmentioning

confidence: 99%

Section: Analysis Of the Yfs Resistance Oscillation Dynamicsmentioning

confidence: 99%

See 1 more Smart Citation

Dissipative structure suppression as a way to increase the sustainable improvement of the frame support bearing capacity

Nazimko¹,

Zakharova²,

Merzlikin

et al. 2022

IOP Conf. Ser.: Earth Environ. Sci.

View full text Add to dashboard Cite

show abstract

“…On the basis of a broader set of tests of arch supports of various types and sizes (Pacześniowski & Taborek, 2014), it was found that the loading at the moment of the first slip F 1 is very close to the total load-bearing capacity support F N under that standard (Pacześniowski & Taborek, 2014) and corresponds to findings from practice (Majcherczyk et al, 2014). The friction coefficients in the tuned FE model correspond with values for a slightly corroded surface (Horyl & Šňupárek & Maršálek, 2014).…”

Section: Resultssupporting

confidence: 54%

Simulation of Laboratory Tests of Steel Arch Support

Horyl¹,

Šňupárek²,

Maršálek³

et al. 2017

Archives of Mining Sciences

Self Cite

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The total load-bearing capacity of steel arch yielding roadways supports is among their most important characteristics. These values can be obtained in two ways: experimental measurements in a specialized laboratory or computer modelling by FEM. Experimental measurements are significantly more expensive and more time-consuming. However, for proper tuning, a computer model is very valuable and can provide the necessary verification by experiment. In the cooperating workplaces of GIG Katowice, VSB-Technical University of Ostrava and the Institute of Geonics ASCR this verification was successful. The present article discusses the conditions and results of this verification for static problems. The output is a tuned computer model, which may be used for other calculations to obtain the load-bearing capacity of other types of steel arch supports. Changes in other parameters such as the material properties of steel, size torques, friction coefficient values etc. can be determined relatively quickly by changing the properties of the investigated steel arch supports.

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“…The main objective of the study of friction joints under dynamic (impact) loading simulating rock burst, presented in this article, is to identify possible sources of ignition of explosive atmospheres during impulsive loading of a yielding steel arch support under rock burst conditions. This research is new to the extensive studies of friction joints presented by Brodny (2012a and 2012b) and other researchers (Ciałkowski, 1996;Pacześniowski and Pytlik, 2008;Horyl et al, 2014Horyl et al, , 2017Horyl et al, and 2019, which were mainly focused on determining the resistance of friction joints under static and dynamic loading.…”

Section: Introductionmentioning

confidence: 75%

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

Pytlik

Frąc

2023

Studia Geotechnica Et Mechanica

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Methane and coal dust explosions are among the most common causes of disasters in hard coal mining. Therefore, it is important for occupational safety in hard coal mines operating under methane and coal dust explosion hazards to identify possible ignition sources, whether due to natural or technical factors. One technical source of ignition can be mechanical sparks generated during operation of mechanical equipment and high surface temperatures of equipment components during operation. This paper presents the methodology and results of thermal imaging and strength testing of roadway support elements under dynamic loading. The goal of the tests was to identify the potential explosive atmosphere ignition sources during the operation of the support under the conditions of rock bursts. The scope of testing encompassed the temperature measurements by means of thermal camera of friction prop and yielding support frame sliding joint elements at yield under dynamic impact loading (simulating a burst). Significant joint element heating and mechanical sparking was observed during the testing of arching yielding support frame sliding joints and straight friction prop joints as a result of friction at yield. Some of the aspects defined in standard PN-EN ISO80079-36:2016 include the maximum temperature T max =150°C for a surface that can accumulate a layer of coal dust. Tests of the friction joints have shown that during impact loading, numerous mechanical sparks are produced at the friction joints of sections of the steel prop, with the surface temperature of the sections starting from 169.6°C and reaching up to 234.1°C. During tests it was also to determined emissivites of the tested sliding joints constructed from V29-V32 secrions depending on corrosion products which consist in range 0.842–0.873. Such a high temperature can initiate an explosive mixture consisting of methane, air and coal dust.

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Behaviour of Frictional Joints in Steel Arch Yielding Supports

Cited by 8 publications

References 8 publications

Dissipative structure suppression as a way to increase the sustainable improvement of the frame support bearing capacity

Dissipative structure suppression as a way to increase the sustainable improvement of the frame support bearing capacity

Simulation of Laboratory Tests of Steel Arch Support

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

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