Pull-out debonding characteristics of rockbolt with prefabricated cracks in rock: a numerical study based on particle flow code

Shi, Hao; Zhang, Houquan; Chen, Wenlong; Song, Lei; Li, Ming

doi:10.1007/s40571-023-00607-9

Cited by 16 publications

(1 citation statement)

References 50 publications

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“…Men (2023) and Li et al (2023), through simulation analysis, examined the stress and deformation of surrounding rock supported by different anchor rod densities, highlighting the existence of an optimal value to ensure roadway support safety. Shi et al (2023b); Shi et al (2024) considered the influence of fracture distribution and analyzed the interaction between the rock bolt and rock mass through the simulation of bolt pull-out tests. Osgoui and Unal (2009) designed and modified the anchor bolt density through experimental and theoretical methods to evaluate the convergence of the tunnel.…”

Section: Introductionmentioning

confidence: 99%

Analysis of stability in pedestrian downhill roadway at Yindonggou 11th coal mine area: the impact of anchor cable support density

Jinbao

2024

Front. Energy Res.

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The study of cable support density’s impact on the stability of rock in mine roadways is vital for personnel safety, equipment protection, and mining operations continuity. This research examines a typical engineering scenario within the 11th mining area pedestrian downhill roadway of Yindonggou Mine. A numerical model is devised, accounting for post-peak evolution of mechanical parameters in the surrounding rockmass, represented by a plastic shear strain-dependent multi-segment linear function. Factors such as vertical displacement of the roof and floor, cable axial force, and changes in the plastic zone were scrutinized to decipher the influence of anchor cable support density on roadway stability. The study revealed the following results: 1) The displacement pattern of the roadway roof initially decreases at a decreasing rate before stabilizing with an increase in calculation time step. However, the floor displacement increases first at a diminishing rate before achieving stability with increased calculation time. 2) As a result of the pulling effect caused by deformation and movement of roof’s surrounding rock, the axial force of the anchor cable initially rises with a declining rate before reaching a virtually constant value with increased computation time. 3) Analysis of the vertical displacement field of the model illustrates that with the rise in support density, the maximum displacement of the model’s top plate sinking and bottom plate elevation gradually reduces. 4) With the increment in support density, the number of units showing a plastic shear strain greater than 0.2, 0.1, and 0.05 tends to decrease, indicating increased stability of the roadway. Furthermore, it was observed that the probability of plastic shear yielding at the junction of the roadway floor and side is high while the shoulder of the roadway reflects a lower probability.

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Section: Introductionmentioning

confidence: 99%

Analysis of stability in pedestrian downhill roadway at Yindonggou 11th coal mine area: the impact of anchor cable support density

Jinbao

2024

Front. Energy Res.

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Consideration of the Accuracy of Empirical and Indirect Laboratory Methods for the Characterisation of Tension Strength

Sainsbury,

McDonald

2024

Geotech Geol Eng

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This research explores the results of the most common laboratory based indirect tension strength methods over the range of UCS strengths 0.1 MPa (cemented paste backfill) to 100 MPa (concrete). The accuracy of each of the methods is considered through a comparison with direct strength measurements completed on the same material. The results of 241 individual tests suggest that the use of indirect tension methods to determine tension strength for all geo-material strength ranges may provide misleading results unless a correction-factor is applied. Correction factors that relate splitting and flexure results to direct tension results are provided. The correction factors are based on the characteristic UCS of the material. A comparison of the traditional empirical relationship to derive tension from UCS is presented and an updated relationship is proposed that is relevant over the UCS strength range 0.1–100 MPa.

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A Numerical Model for the Bearing Capacity of Anchoring Interface in Composite Rock Mass by A Modified Nonlinear Bond-Slip Model

Li,

Gong,

et al. 2024

KSCE J Civ Eng

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Pull-out debonding characteristics of rockbolt with prefabricated cracks in rock: a numerical study based on particle flow code

Cited by 16 publications

References 50 publications

Analysis of stability in pedestrian downhill roadway at Yindonggou 11th coal mine area: the impact of anchor cable support density

Analysis of stability in pedestrian downhill roadway at Yindonggou 11th coal mine area: the impact of anchor cable support density

Consideration of the Accuracy of Empirical and Indirect Laboratory Methods for the Characterisation of Tension Strength

A Numerical Model for the Bearing Capacity of Anchoring Interface in Composite Rock Mass by A Modified Nonlinear Bond-Slip Model

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