Structural Evaluation of Cable Bolts under Static Loading

Tahmasebinia, Faham; Yang, Adam; Feghali, Patrick; Skrzypkowski, Krzysztof

doi:10.3390/app13031326

Cited by 17 publications

(7 citation statements)

References 36 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The tensile strength and yield strength of the steel strands are 2.78 times and 3.2 times that of the rebar, respectively; therefore, the steel strands have a better bearing capacity. The cable support is adapted to variable load conditions [24,25], especially shear stresses, which may occur during mining disturbances. The utilization of steel strands for supporting the roadway roof enables not only effective thick anchorage, but also the application of high pre-tightening force.…”

Section: Double-layer Flexible Support Techniquementioning

confidence: 99%

The Active Roof Supporting Technique of a Double-Layer Flexible and Thick Anchorage for Deep Withdrawal Roadway under Strong Mining Disturbance

Han,

Yuan,

Ding

et al. 2023

Applied Sciences

View full text Add to dashboard Cite

Due to the strong disturbance of a mining face, the surrounding rock of the withdrawal roadway is susceptible to deformation and failure, which restricts the safe and efficient evacuation of mining equipment. To resolve this longstanding technical problem in mine production, an engineering investigation, numerical simulation, theoretical analysis, and other research methodologies were conducted in this study. Furthermore, the influence mechanism of mining-induced stress on the withdrawal roadway was revealed, the anti-disturbance principles of thick-layer anchorage of roadway roofs were elucidated, and a novel double-layer flexible support technique was proposed. The front abutment pressure, stress superposition, damage accumulation of the surrounding rock, and the fluctuation of mining-induced stress are the primary factors contributing to the significant deformation of the surrounding rock in a withdrawal roadway. However, the fluctuation of mining-induced stress has usually been ignored in previous studies, and it may be the most crucial cause of the significant deformation and instability of the surrounding rock. The thickness of the anchored rock beam is the most vital factor affecting the maximum subsidence and maximum tensile stress of the roof, and increasing the thickness of the anchored rock beam can significantly improve the stability and anti-disturbance performance of the roof. In the proposed double-layer flexible supporting technique, flexible steel strands serve as the carrier, which overcomes the constraint of the roadway height on the length of roof support components. The first layer of flexible support is used to construct a thick fundamental anchorage layer, while the second layer is employed to construct a thicker reinforced anchorage layer, facilitating the effective resistance of the roof against strong mining disturbances. The effectiveness of this technique was further validated through the application of an engineering practice. The research results have reference value for solving the difficult problem of mining roadway support.

show abstract

Section: Double-layer Flexible Support Techniquementioning

confidence: 99%

The Active Roof Supporting Technique of a Double-Layer Flexible and Thick Anchorage for Deep Withdrawal Roadway under Strong Mining Disturbance

Han,

Yuan,

Ding

et al. 2023

Applied Sciences

View full text Add to dashboard Cite

show abstract

“…In severe cases, it can lead to the destruction of the roof and floor, or even demolish the mine drifts, potentially resulting in casualties. It represents one of the typical geological disasters in mining engineering (Wang, 2012;Patynska, 2013;Du, 2022;Tahmasebinia et al, 2023). The bursting liability of coal refers to the ability and inherent property of coal to generate impact damage, which is the internal cause and critical condition for rock burst occurrence (Wang, 2012;Wang et al, 2017a;Zhang et al, 2022).…”

Section: Introductionmentioning

confidence: 99%

A coal bursting liability evaluation model based on fuzzy set theory and analysis of three influencing factors

Wang,

Jin,

Liu

et al. 2024

Front. Earth Sci.

View full text Add to dashboard Cite

The classification of coal bursting liability is of great significance for the prevention and control of rock burst. To address the shortcomings in existing bursting liability classification methods, a comprehensive evaluation model for bursting liability based on a combination of weighted-fuzzy set theory and three influencing factor analyses is proposed. The model selects four evaluation indicators: dynamic failure time (DT), elastic energy index (WET), bursting energy index (KE), and uniaxial compressive strength (RC). Two types of membership functions, trapezoidal fuzzy numbers (TFN) and Gaussian fuzzy numbers (GFN), are used to quantitatively describe the fuzziness between indicator levels. The Delphi method and a random forest feature identification method are combined to obtain a subjective and objective combined weighting, determining the optimal combination weight of the four indicators. Based on Zadeh operator (ZO), maximum-minimum operator (MMO), weighted-average operator (WAO), and all-around restrictive operator (ARO), calculations are carried out for the synthesis of indicator weights and memberships. Maximal membership principle (MMP) and Credible identification principle (CIP) are utilized as evaluation principle to assess the bursting liability level, constructing 16 fuzzy comprehensive evaluation models. The impact of membership functions, fuzzy operators, and evaluation principle on evaluation results are systematically analyzed based on the discrimination results of 127 sample sets. The results show that the optimal fuzzy comprehensive evaluation model is constructed using the trapezoidal fuzzy numbers, weighted average operator, and maximal membership principle (TFN-WAO-MMP), with a classification accuracy of 97.64%. Finally, the optimal model is applied to 10 engineering instances, and the evaluation results are consistent with the actual situation, verifying the reliability and effectiveness of the model. Overall, these findings contribute to the development of a more sophisticated and accurate method for assessing the rock burst tendency of coal specimens. By leveraging the theory of fuzzy sets, this approach provides a more nuanced and nuanced evaluation of rock burst tendency, and thus offers the potential to improve workplace safety and efficiency in the coal mining industry.

show abstract

“…Therefore, this paper proposes a new roof support scheme, the full anchor cable support scheme, aimed at providing effective support for roadways where the thickness of the soft rock mass in the roof exceeds the anchorage range of bolts. Cable support not only exhibits high tensile strength under static conditions but also possesses the ability to absorb the kinetic energy of moving rocks under dynamic loads [23,24]. The scheme is intended to ensure safe production, which is justified by numerical simulations and observed by field measurements.…”

Section: Introductionmentioning

confidence: 99%

Full Anchor Cable Support Mechanism and Application of Roadway with Thick Soft Rock Mass Immediate Roof

2023

View full text Add to dashboard Cite

The focus of this paper is the thick soft rock mass roof of the track roadway in the No. 3606 panel of the Chaili Coal Mine. Due to its substantial thickness, the soft rock mass roof of the roadway is susceptible to damage and deformation during the mining process. In order to preserve the integrity of the roadway roof, a full anchor cable support scheme is proposed after studying the mechanism of bolt-anchor cable support. The supporting parameters and feasibility of the scheme were determined through support experience and numerical simulation analyses in the field. Moreover, on-site monitoring and data analysis were conducted, revealing that the anchor cables and anchor bolts played a stable role in supporting the roadway. The displacement of the roadway’s roof and floor was minimal, as was the displacement of the two ribs. The overall deformation of the roadway was minor. Practice demonstrated that the full anchor cable support method was effective in supporting the immediate roof of thick soft rock.

show abstract

Structural Evaluation of Cable Bolts under Static Loading

Cited by 17 publications

References 36 publications

The Active Roof Supporting Technique of a Double-Layer Flexible and Thick Anchorage for Deep Withdrawal Roadway under Strong Mining Disturbance

The Active Roof Supporting Technique of a Double-Layer Flexible and Thick Anchorage for Deep Withdrawal Roadway under Strong Mining Disturbance

A coal bursting liability evaluation model based on fuzzy set theory and analysis of three influencing factors

Full Anchor Cable Support Mechanism and Application of Roadway with Thick Soft Rock Mass Immediate Roof

Contact Info

Product

Resources

About