Mechanism of bond failure and load distribution along fully grouted cable-bolts

Moosavi, M.; Bawden, W.F.; Hyett, A. J.

doi:10.1179/mnt.2002.111.1.1

Cited by 22 publications

(12 citation statements)

References 9 publications

(13 reference statements)

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“…This research is further explained in a recent publication by Moosavi et al [7]. Implementation of standard cable bolt algorithm into a continuum program (Phase2 software, Rocscience Ltd.) has shown a great improvement in reinforcement design but this has never been implemented into a numerical stress analysis package with the capability to solve for discontinuous rock masses.…”

Section: Introductionmentioning

confidence: 95%

A model for cable bolt-rock mass interaction: Integration with discontinuous deformation analysis (DDA) algorithm

Moosavi

Grayeli

2006

International Journal of Rock Mechanics and Mining Sciences

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Section: Introductionmentioning

confidence: 95%

A model for cable bolt-rock mass interaction: Integration with discontinuous deformation analysis (DDA) algorithm

Moosavi

Grayeli

2006

International Journal of Rock Mechanics and Mining Sciences

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“…The anchoring interface failure mostly occurs at the boltgrout interface in many pulling out tests [21][22][23][24][25]. The stress distribution in an elementary length dx is taken for analysis, as shown in Figure 1(b).…”

Section: Analysis Model Of Rock Bolt In Rock Mass With Bedding Separa...mentioning

confidence: 99%

Simulation Study on Mechanical Characteristics of Rock Bolt in Rock Mass with Bedding Separation Based on the Nonlinear Bond Slip Relationship

Fu-qiang

et al. 2022

Geofluids

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The mechanical equation on the mechanical characteristics of rock bolt in rock mass with bedding separation is established, based on the bond slip relationship of anchoring interface by the load transfer method. The validity of the numerical simulation is verified by the analytical solution of mechanical equation, when the bond slip relationship is linear. Further, the nonlinear bond slip relationship of anchoring interface is input into Flac3D by FISH. The mechanical characteristics of rock bolt are studied with the single and multiple bedding separation by numerical simulation. The results show that the axial force and the interfacial shear stress distribution curves on both sides are symmetrically distributed with the single bedding separation in rock mass, when the bedding separation is located in the center of the anchoring segment. When the bedding separation positions are not located in the center of the anchoring segment, the bedding separation value at different positions versus the axial force curves shows a single peak distribution. The axial force of rock bolt is mainly controlled by the side with the shorter anchoring length. Compared with the single bedding separation in rock mass, the additional stress of rock bolt occurred by the multiple bedding separation will superimpose each other. This paper leads to a better understanding for the load transfer mechanism for grouted rock bolt systems in rock mass with bedding separation and provides a reference for scientific support design and evaluation method.

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“…e results showed that the higher the radial confining pressure, the higher the peak strength, but the relationship is not linear. Moosavi et al [12][13][14] developed an analytical model based on linear dilation assumption and conducted a series of parametric studies using both plain and modified cable bolts. e results showed that the bond failure mechanism for cable bolts is a frictional dilatational process controlled by the helical surface morphology of the cable.…”

Section: Introductionmentioning

confidence: 99%

Simulation Research on the Load Transfer Mechanism of Anchoring System in Soft and Hard Composite Rock Strata under Tensile Loading Conditions

Gong

et al. 2020

Advances in Materials Science and Engineering

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Soft and hard composite rock strata are frequently encountered in transportation, geotechnical, and underground engineering. However, most of the current support is designed for homogeneous rock masses, which ignores the different anchoring effect in soft and hard composite rock strata. A numerical study is presented in this paper on the pull-out behavior of fully grouted rock bolts in soft and hard composite rock strata. The nonlinear bond-slip relationship of bolt-grout interface that is anchored in soft rock and hard rock is obtained from laboratory test, respectively. Then, the nonlinear bond-slip relationship is put into the numerical model. The numerical result shows a close match with the experiment tests and the proposed model. Lithological sequence, layer thickness ratio, and layer numbers are taken into consideration in numerical simulation models. Under the same layer number, the shallower-soft and deeper-hard composite rock strata (SHCRS) have a higher bearing capacity and deformation resistance than the shallower-hard and deeper-soft composite rock strata (HSCRS). As the soft-to-hard thickness ratio in SHCRS increases, the initial stiffness of the load-displacement curve and peak load decreases continuously. The load-displacement curve shows the same initial stiffness for different hard to soft thickness ratios in HSCRS. As the hard to soft thickness ratio increases, the load peak and the displacement at the peak load increase. Therefore, the closer the hard rock is to the loading end, the greater the initial stiffness of the load-displacement curve is. The greater the hard rock thickness, the larger the peak load. Under the same anchor length, the peak load and the displacement at the peak load decrease with the increase of layer numbers, but the reduction magnitude decreases. This paper leads to a better understanding of the load transfer mechanism for the anchoring system in soft and hard composite strata and provides a reference for scientific support design and evaluation method.

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Mechanism of bond failure and load distribution along fully grouted cable-bolts

Cited by 22 publications

References 9 publications

A model for cable bolt-rock mass interaction: Integration with discontinuous deformation analysis (DDA) algorithm

A model for cable bolt-rock mass interaction: Integration with discontinuous deformation analysis (DDA) algorithm

Simulation Study on Mechanical Characteristics of Rock Bolt in Rock Mass with Bedding Separation Based on the Nonlinear Bond Slip Relationship

Simulation Research on the Load Transfer Mechanism of Anchoring System in Soft and Hard Composite Rock Strata under Tensile Loading Conditions

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