Load Transfer Characteristics of a Cable Bolt in DEPT

Li, Xuwei

doi:10.1155/2019/2106741

Cited by 6 publications

(5 citation statements)

References 5 publications

(5 reference statements)

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“…As suggested by Figs. 13, 14, and 15, the effect of rotation on the cable pull-out load was relatively small and similar to the findings of Li (2019). This was more evident in the larger diameter cables compared to the smaller cable such as the Superstrand cable.…”

Section: Resultssupporting

confidence: 69%

“…Thomas (2012), Chen et al (2015), , and Hagan and Li (2017) conducted studies on the various characteristics of cable bolts using a Modified Laboratory Short Encapsulation Pull Test (MLSPET). Aziz et al(2016) and Li (2019) reported on a series of pull-out tests on cable bolts using the Minova Axially Split Embedment Apparatus (MASEA). This setup used the double embedment concept of SSPT with the unequal embedment length concept of the LSEPT.…”

Section: Introductionmentioning

confidence: 99%

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Axial Performance of Cementitious Grouted Cable Bolts Under Rotation Constraint Scenarios

et al. 2022

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With the increased use of cable bolts in mining and civil projects worldwide, it is important to understanding the performance of these support structures in different scenarios. The axial load transfer mechanisms of six cable bolts were investigated experimentally in this research study. A large-scale pull-out testing apparatus with a capacity of 1000 kN was designed and manufactured as part of the investigation. A common commercial cementitious grout with a uniaxial compressive strength of 60 MPa was used to encapsulate 300 mm length samples. Passive confinement encapsulated each sample to ensure the concrete’s integrity during the testing. The encapsulated cable bolts were then subjected to axial loads using a hydraulic ram, with the axial load and displacement measured using a load cell and LVDTs. Two scenarios were investigated: free rotation and restricted rotation. The results demonstrated that the apparatus effectively recorded the behaviour of the cable during pull-out and identified that the radial stiffness of the samples had a significant impact on the overall load of the system. The results also indicated that rotation had a limited influence on the load behaviour of the samples tested.

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Section: Resultssupporting

confidence: 69%

Section: Introductionmentioning

confidence: 99%

Axial Performance of Cementitious Grouted Cable Bolts Under Rotation Constraint Scenarios

et al. 2022

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“…This pattern resembles the sinking behavior observed in the roof displacement (see Figure 6). The deformation of the roof's surrounding rock and the tensile deformation of the moving traction anchor cable contribute to the gradual increase in axial load (Jahromi et al, 2011;Li et al, 2019;Shi et al, 2019). However, under the combined influence of the self-supporting capacity of the surrounding rock and the growing constraints provided by anchor cable support, the deformation speed of the surrounding rock is controlled and exhibits a gradual decrease (see Figure 6), corresponding to a reduction in the rate of increase for the axial load of the anchor cable.…”

Section: Analysis Of Evolution Of Anchor Cable Loadmentioning

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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“…Experiments are unanimously stating the fact that the stronger grout, the higher the pullout load is expected [10], [25]- [27]. Also, the longer curing time results in higher strength; however, similar to other cementitious materials, the strength increases logarithmically, and 99% of the strength is usually achieved after 28 days [28]- [30]. This paper introduces a newly developed laboratory equipment that enables static and dynamic pullout tests of tendons under static and dynamic loading conditions.…”

Section: Introductionmentioning

confidence: 99%

Laboratory study of the behaviour of grouted cable bolts under static and dynamic axial loading

Anzanpour

Aziz

Remennikov

et al. 2023

IOP Conf. Ser.: Earth Environ. Sci.

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As a typical roof-supporting system of tunnels, Cable bolts are subjected to static and dynamic loading conditions caused by ground movements and mining activities. As mining goes deeper, the chance of undetermined ground stress concentrations increases and subsequently, the probability of sudden unexpected failures such as rock bursts increases. Many studies have been carried out to simulate the axial loading condition of the tendons, especially cable bolts, under static and dynamic loading modes; however, it barely can be seen that both behaviours have been studied and compared simultaneously. From other points of view, although research has been conducted on Barrel and Wedge and load-bearing plates, these components have hardly been considered together in axial loading studies. In this laboratory study, a new pullout testing mechanism has been introduced, which is capable of implementing axial loading of cable bolts in both static and dynamic loading conditions. In addition, in a parametric study, the role of bulbs of the cable bolts as well as barrel and wedges on the load-bearing capacity of the anchors have been examined. The bond between cable bolts and grout material in the bulbed cables behaves almost 30% stronger in static and 40% stronger in dynamic tests in comparison with plain cables. In general, the required pullout energy in dynamic tests was 25-50% less than in static tests.

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Load Transfer Characteristics of a Cable Bolt in DEPT

Cited by 6 publications

References 5 publications

Axial Performance of Cementitious Grouted Cable Bolts Under Rotation Constraint Scenarios

Axial Performance of Cementitious Grouted Cable Bolts Under Rotation Constraint Scenarios

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

Laboratory study of the behaviour of grouted cable bolts under static and dynamic axial loading

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