Evaluation of the Effects of Yielding Rockbolts on Controlling Self-Initiated Strainbursts: A Numerical Study

Wang, Jun; Apel, Derek B.; Xu, Huawei; Wei, Chenyu; Skrzypkowski, Krzysztof

doi:10.3390/en15072574

Cited by 17 publications

(8 citation statements)

References 56 publications

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“…Load bearing capacity is not a sufficient parameter in rock bolting designs. Also, the energy absorption capacity parameter should be considered for the performance of rock bolts [32][33][34][35].…”

Section: Discussionmentioning

confidence: 99%

Investigation of New Energy Absorbing Mechanisms Used to Fix Rock Bolt Plates

Komurlu

2023

Period. Polytech. Civil Eng.

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In this study, different plate fixing designs were tested in order to improve rock bolting performances. Instead of commonly used steel nuts, different plate fixing designs were investigated by both laboratory and site studies. In addition, the usability of nuts and energy absorbers made of the polyamide type engineering polymer was investigated to assess whether they are advantageous for the aim of supplying high-energy absorbing features. In this experimental study, deformation-controlled load tests were carried out to evaluate the bearing and energy absorption capacities of totally eight different groups of specimens. According to the findings from this study, use of the polyamide material with steel nuts as an energy absorber material, rather than using instead of steel nuts supplies good results. As another outcome, it has been determined that use of proper washers between steel nuts and polyamide absorbers can significantly improve the energy absorption performances. It has been evaluated that the energy absorption capacity of the bolt plates can be economically increased up to 10 times by using suitable polyamide energy absorbers placed between the plate and steel nut parts. It was concluded that the polyamides can be used to remarkably improve the rock bolting performances especially in the rock masses where the high energy absorption capacity property is needed, like those with rock bursting, squeezing and swelling problems.

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Section: Discussionmentioning

confidence: 99%

Investigation of New Energy Absorbing Mechanisms Used to Fix Rock Bolt Plates

Komurlu

2023

Period. Polytech. Civil Eng.

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“…In addition, the selection of roadway support under dynamic pressure is intricately intertwined with roadway section shape and surrounding rock condition, which must be met for specific geological and mining conditions [13], and dynamic loads contribute to the use of a support that is not only more durable but yielding [14]. Some scholars have improved the support technology of dynamic pressure roadways and proposed targeted support schemes.…”

Section: Introductionmentioning

confidence: 99%

“…Sci. 2024,14, 1858 12 of mining influence coefficient increases, the shape of the plastic zone changes from ellipti to butterfly, and the plastic zone gradually expands to the roof and floor corners of t roadway. As the supporting force increases, the plastic zone decreases slightly, but shape does not change.…”

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confidence: 99%

Research on the Failure Mechanism of Surrounding Rock in a Dynamic Pressure Roadway and Active and Passive Coordinated Support Technology

Shan,

Wei,

Wang

et al. 2024

Applied Sciences

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To study the phenomenon of large deformation and the failure of roadways under dynamic pressure, this paper takes the 10607 gas drainage roadway as the research object and presents the results of a theoretical derivation of equations for the boundary of the plastic zone of a dynamic pressure roadway with and without supporting force. The impacts of the mining influence coefficient and supporting force on the plastic zone boundary were explored for various lateral pressure coefficients. As the supporting force was increased, it was observed that there was a slight reduction in the radius of the plastic zone of the dynamic pressure roadway, while its scope and shape barely changed. Based on the failure mechanism of the dynamic pressure roadway, active and passive support technology was proposed, and the support effect was analyzed using FLAC3D 5.0 numerical simulation software for the case of the 10607 gas drainage roadway.

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“…In terms of surrounding rock reinforcement technology, anchor support technology, as one of the most common rock reinforcement means, plays an indispensable role in mining engineering, slope reinforcement, and other fields [15,16]. Anchor support significantly improves the tunnel support effect, reduces the cost of tunnel support, and reduces the labor intensity of workers.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on the Relationship between the Degree of Surrounding Rock Fragmentation and the Adaptability of Anchor Support

Wang,

Tang

et al. 2023

Applied Sciences

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Taking the roadway peripheral rock anchoring unit as the research object, the rock compression test containing the anchor solid was carried out to analyze the influence of the degree of peripheral rock fragmentation and the anchor support method on the mechanical properties of the rock body. The test results showed that the smaller the size of the structural surface, the more a greater number of anchor rods were needed, which in turn provided better support. With the increase in the size of the structural surface, the uniaxial compressive strength and modulus of elasticity of the specimen showed a gradual decrease. Numerical tests of the uniaxial compression of rock containing cohesive units showed that the deformation of the specimen near the anchor bar was significantly reduced, while the main rupture surface was blocked, and an obvious reinforcement zone was formed near the anchor bar. Under the double-anchor condition, the anchor tension stress was more obvious, the reinforcement zone was wider, and the rock rupture surface was strongly blocked, all of which made its reinforcement effect the more obvious. This double-anchor condition showed that the anchoring effect of the anchor rods on the specimens was reflected in two aspects of reinforcement and crack stopping. The denser the anchor rods, the wider the reinforcement zone and hence the more likely that the superposition effect will occur, which allowed the anchor rods to play a greater supporting role in stabilizing the rock. The research results can provide a theoretical basis for the design of anchor support and early warning prediction of destabilization damage in the fractured surrounding rock of coal mine roadways.

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Evaluation of the Effects of Yielding Rockbolts on Controlling Self-Initiated Strainbursts: A Numerical Study

Cited by 17 publications

References 56 publications

Investigation of New Energy Absorbing Mechanisms Used to Fix Rock Bolt Plates

Investigation of New Energy Absorbing Mechanisms Used to Fix Rock Bolt Plates

Research on the Failure Mechanism of Surrounding Rock in a Dynamic Pressure Roadway and Active and Passive Coordinated Support Technology

Experimental Study on the Relationship between the Degree of Surrounding Rock Fragmentation and the Adaptability of Anchor Support

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