Synchronization of the yield as a way to increase integrity and bearing capacity of the frame supports

Nazimko, Victor

doi:10.1080/24705314.2021.1971890

Cited by 4 publications

(2 citation statements)

References 16 publications

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“…YFS main duty is to control ground deformation around the underground opening but not to prevent it. Synchronous radial irreversible movement of the ground inevitably causes self-wedging effect when discrete adjacent pieces of the surrounding rock mass block and jam each other [37]. This behavior generates a self-supporting effect [38] resistance of which is by two orders more than YFS resistance.…”

Section: Possible Ways To Control the Stick-slip Friction In Yfsmentioning

confidence: 99%

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: Possible Ways To Control the Stick-slip Friction In Yfsmentioning

confidence: 99%

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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show abstract

“…Structural health monitoring (SHM) is significant in civil infrastructure for evaluating structural behavior in the field [2][3][4][5][6][7][8]. Sensors used for monitoring the deformation of concrete structures are conventionally attached types (e.g., linear variable differential transformer (LVDT) and strain gauge).…”

Section: Introductionmentioning

confidence: 99%

Development of Non-Contact Measurement Techniques for Concrete Elements Using Light Detection and Ranging

Pham,

Kim,

Woo

et al. 2023

Applied Sciences

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The objective of this study is to develop a monitoring algorithm that measures the displacement of concrete structures using light detection and ranging (LiDAR). The suggested method is based on non-contact measurements providing 3D point clouds of the scanning area with high resolution. This overcomes the limitation of traditional contact-type and point-based measurement methods such as linear variable differential transformer (LVDT) and strain gauge. The developed algorithm enables one to track the boundaries of a concrete specimen and measures the vertical or lateral displacement. To demonstrate that displacement in the horizontal and vertical direction can be measured irrespective of the field of view (FOV), two different concrete specimens were constructed where gradually increasing vertical or lateral loads were applied. Then, the displacements were monitored using the set of LVDT and LiDAR for the correlation analysis. The results demonstrated a high accuracy of 98~99% correlation in comparison between LVDT and LiDAR.

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Dissipative structures as a cause of the asynchronous development of the damaged zone surrounding underground roadways

Nazymko

2024

International Journal of Rock Mechanics and Mining Sciences

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Synchronization of the yield as a way to increase integrity and bearing capacity of the frame supports

Cited by 4 publications

References 16 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

Development of Non-Contact Measurement Techniques for Concrete Elements Using Light Detection and Ranging

Dissipative structures as a cause of the asynchronous development of the damaged zone surrounding underground roadways

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