Mechanical Properties and Application of Right-Hand Rolling-Thread Steel Bolt in Deep and High-Stress Roadway

Zhang, Jinpeng; Liu, Limin; Shao, Junpeng

doi:10.3390/met9030346

Cited by 11 publications

(5 citation statements)

References 40 publications

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“…The ordinary plates have low energy absorption capacities especially in the non-axial loading case. As it is confirmed by the results obtained from this study, it is common to see early failures of plate stabilizer elements like nuts and welded rings due to the concentrated and non-uniform load distribution (Zhang et al, 2019;Li, 2010;Kang et al, 2015). Even in the non-axial loading condition, the spring plate was determined to have proper contact to the ring.…”

Section: Resultssupporting

confidence: 79%

Improving performances of friction rock bolts by using new spring plates

Komurlu

2021

Bilimsel Madencilik Dergisi

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In this study, a new spring plate was designed and investigated for its usability with the split set type friction bolts. According to the results of this study, remarkable active support pressures can be practically supplied by compression of the new spring plate during the insertion of the split sets. In addition to easy supply of the active support pressure owing to the insertion of the bolts, the energy absorption capacity can be highly improved by use of the new spring plate. Furthermore, the new plate design is remarkably advantageous against the nonaxial loading condition which is very wide in the bolted rock masses.

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Section: Resultssupporting

confidence: 79%

Improving performances of friction rock bolts by using new spring plates

Komurlu

2021

Bilimsel Madencilik Dergisi

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“…Currently, a rigid anchor bolt made from non-longitudinal reinforced threaded steel has been extensively used in most roadway supports [22,23]. The ultimate length of this type of anchor bolt is constrained by the following three factors: (1) the anchor bolt's inability to bend; (2) the design height of the roadway limits the roof bolt length; and (3) a portion of the gangue in the excavation face is not transported out in a timely manner, but instead serves as a working platform for roof support (otherwise, the workers are unable to access the roof if the roadway elevation is too high).…”

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

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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.

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“…e transportation rise in Yili No. 1 Coal Mine is supported by means of bolts, meshes, anchor cables, and shotcrete [50][51][52][53][54]. e roadway support section is presented in Figure 16.…”

Section: Engineering Practice Verificationmentioning

confidence: 99%

Study on the “Pressure Relief and Yielding Support” Joint Prevention and Control Technology for the Weak Impact Roadway in the Extremely Thick Coal Seam

Yin

Liu

Sun

et al. 2021

Advances in Civil Engineering

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Weak impact occurs during roadway excavation in some extremely thick coal seams in China. Although this hazard is not enough to destroy the roadway, it will cause fracturing and large deformation of the roadway surrounding rock, resulting in the fracturing of bolts and anchor cables and bringing great difficulties to roadway support. In the hope of solving this problem, firstly, the reason for impact occurrence in the roadway of the extremely thick coal seam is analyzed from the perspective of energy. Then, the surrounding rock fracture evolution in such a roadway is explored by means of numerical simulation, microseism, and borehole observation. Furthermore, the “pressure relief and yielding support” joint prevention and control technology is proposed and applied to Yili No. 1 Coal Mine. The field engineering application results show that the joint prevention and control technology can effectively reduce the impact energy and ensure the stability of the roadway surrounding rock in the extremely thick coal seam. The research findings can provide a theoretical foundation for the roadway support of the same type.

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Mechanical Properties and Application of Right-Hand Rolling-Thread Steel Bolt in Deep and High-Stress Roadway

Cited by 11 publications

References 40 publications

Improving performances of friction rock bolts by using new spring plates

Improving performances of friction rock bolts by using new spring plates

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

Study on the “Pressure Relief and Yielding Support” Joint Prevention and Control Technology for the Weak Impact Roadway in the Extremely Thick Coal Seam

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