Numerical study of the bolt-grout interface for fully grouted rockbolt under different confining conditions

Ho, Duc An; Bost, Marion; Rajot, Jean-Pierre

doi:10.1016/j.ijrmms.2019.04.017

Cited by 38 publications

(12 citation statements)

References 22 publications

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“…Accessories. Laboratory tests were conducted to analyze the mechanical matching characters of the rock bolt accessories under the axial loading condition [35][36][37][38]. The rock bolt performance test platform consists of chucks, a displacement measurement, and a testing data acquisition apparatus to simulate the actual working condition of rock bolts.…”

Section: Mechanical Matching Test Of Rock Bolt Reinforcementmentioning

confidence: 99%

An Improved Numerical Simulation Approach for the Failure of Rock Bolts Subjected to Tensile Load in Deep Roadway

et al. 2020

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Our goal was to develop an effective research tool for roadways with significant deformations supported by rock bolts. The improved numerical simulation approach is constructed through additional development of FLAC3D. The aim is to modify the shortcoming that the original model in FLAC3D regards the plastic tensile strain of any arbitrary rock bolt element node as the rupture discrimination criterion. The FISH programming language is adopted to conduct the secondary development and to embed the revised model into the main program of FLAC3D. Taking an actual mining roadway as the simulation object, two simulation schemes adopting the newly improved approach and the original method were conducted, respectively. The results show that (1) the PILE element that constitutes the rock bolt-free section with the maximum elongation rate ruptures after modification, while the rock bolt tendon elongation rate reaches beyond the predefined tensile rupture elongation rate; (2) the modified model in which the rock bolt is mainly subjected to tension realises the tensile rupture phenomenon at the end of the rock bolt-free section and the rock bolt at the junction between the free section and the anchoring section; and (3) only four rock bolts that are in the roadway sides showed rupture in the modified model, and all rock bolts showed rupture in the original model. The tensile failure of the rock bolt led that the modified model scheme is closer to the actual. Compared with the modified model, in the original model, deformation of the surrounding rock masses is severe. This is resulted by the rupture of all rock bolts in the original model. The analysis shows that the improved numerical simulation approach is much more reliable for large deformation roadway behavior with rock bolt support.

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Section: Mechanical Matching Test Of Rock Bolt Reinforcementmentioning

confidence: 99%

An Improved Numerical Simulation Approach for the Failure of Rock Bolts Subjected to Tensile Load in Deep Roadway

et al. 2020

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“…The results showed that the rock bolt rib angle had a significant effect on the performance of rock bolts. Ho et al (2019) investigated the bond failure mechanism in the anchorage body. It was found that when the rock bolt was subjected to the high confining stress condition, the bolt/grout interface failed by shearing.…”

Section: Introductionmentioning

confidence: 99%

Studying the performance of fully encapsulated rock bolts with modified structural elements

Chen

Zhao

et al. 2021

Int J Coal Sci Technol

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Numerical simulation is a useful tool in investigating the loading performance of rock bolts. The cable structural elements (cableSELs) in FLAC3D are commonly adopted to simulate rock bolts to solve geotechnical issues. In this study, the bonding performance of the interface between the rock bolt and the grout material was simulated with a two-stage shearing coupling model. Furthermore, the FISH language was used to incorporate this two-stage shear coupling model into FLAC3D to modify the current cableSELs. Comparison was performed between numerical and experimental results to confirm that the numerical approach can properly simulate the loading performance of rock bolts. Based on the modified cableSELs, the influence of the bolt diameter on the performance of rock bolts and the shear stress propagation along the interface between the bolt and the grout were studied. The simulation results indicated that the load transfer capacity of rock bolts rose with the rock bolt diameter apparently. With the bolt diameter increasing, the performance of the rock bolting system was likely to change from the ductile behaviour to the brittle behaviour. Moreover, after the rock bolt was loaded, the position where the maximum shear stress occurred was variable. Specifically, with the continuous loading, it shifted from the rock bolt loaded end to the other end.

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“…Many researchers have carried out different research studies on the microscopic mechanism of grouting engineering and the macroscopic antisinking effect and have obtained valuable research theories and experience in grouting [1][2][3]. Ho et al used the finite element software Abaqus to study the mechanical properties of grouting materials under different confining pressures [4]; Rahimi et al used neural network algorithms to study the waterproofing and penetrating function of the Bakhtiari dam [5]; Moayed et al measured the shear strength of grouted stone bodies based on the laboratory test [6]; Zhu et al used experiments to analyze the grouting reinforcement effect of different grouting materials [7]; Li et al used the multiphysics coupling analysis finite element calculation software Comsol Multiphysics to study the influence of grouting on surface subsidence and groundwater seepage field during foundation pit excavation [8]. Li et al focused on an improved prediction model to determine the limiting grouting pressure of compaction grouting considering the ground surface upheaval, which is caused by the three-dimensional conical shearing failure.…”

Section: Introductionmentioning

confidence: 99%

Study on the Calculation Method of the Diffusion Range of Grouting Slurry for a High‐speed Railway Ballastless Track Subgrade

Yang

Guo

Wei

et al. 2021

Advances in Civil Engineering

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Grouting engineering is the most convenient and quick way to deal with postconstruction settlement. Based on the investigation of the Beijing Shenyang high-speed railway in the early stage, the microdestructive force of grout on the soil mass in the process of grouting with the method of fluid solid coupling theory was analyzed. The numerical simulation results show that, in the grouting process, the greater the grouting pressure, the wider the diffusion range of the slurry and the greater the damage to the microscopic contact force of the slurry to the soil; in addition, when the grouting pressure is below 0.15 MPa, the diffusion form of the slurry in the soil is osmotic grouting; when the pressure is about 0.3 MPa, the diffusion form of the slurry in the soil is compacted grouting; on the basis of the simulation results, a deeper research is carried out, and the calculation formula of the slurry diffusion curve is obtained. It fills in the blank of the theoretical study of the slurry diffusion curve. In this paper, the diffusion formula of grouting slurry can be used in the theoretical study of clay grouting, and it can be used as a reference for practical engineering.

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Numerical study of the bolt-grout interface for fully grouted rockbolt under different confining conditions

Cited by 38 publications

References 22 publications

An Improved Numerical Simulation Approach for the Failure of Rock Bolts Subjected to Tensile Load in Deep Roadway

An Improved Numerical Simulation Approach for the Failure of Rock Bolts Subjected to Tensile Load in Deep Roadway

Studying the performance of fully encapsulated rock bolts with modified structural elements

Study on the Calculation Method of the Diffusion Range of Grouting Slurry for a High‐speed Railway Ballastless Track Subgrade

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