An analytical analysis of the full-range behaviour of grouted rockbolts based on a tri-linear bond-slip model

Ren, Fei; Yang, Zhenjun; Chen, Jianfei; Chen, W. W.

doi:10.1016/j.conbuildmat.2009.08.021

Cited by 240 publications

(107 citation statements)

References 14 publications

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“…Since the total energy released during the bond-slip process is determined by the bond-slip model (e.g., bamboo-modified slurry interface G f � 16.97 N/mm), when the anchorage length exceeds the effective anchorage length (L b ≥ L eff ), the maximum anchoring force is constant and the effect of increasing the anchoring length on the anchoring force is limited. Figure 21 shows the comparison between the bond-slip model proposed in this paper and the bond-slip models obtained by the method of Ren et al [14] and Ma et al [18]. It can be seen that the model proposed in this paper fits well into what obtained by the method of Ma et al, and both of them fully considered the complete decoupling phenomenon.…”

supporting

confidence: 58%

“…At this time, the interface bond stress is almost zero, the effective bond length has a certain value, and the ultimate anchoring force cannot grow with the increase of anchorage length. Bond stress τ (MPa) Figure 21: Comparison between the bond-slip model proposed in this paper and the bond-slip models obtained by the method of Ren et al [14] and Ma et al [18].…”

Section: Discussionmentioning

confidence: 99%

“…Ma et al [15] and Martin et al [16] analyzed the whole process of anchor bolt slippage by using trilinear bond-slip model, which is suitable for the interface of high strength materials such as metal and cement mortar. However, the analytical model used by Li and Stillborg [11], Ren et al [14], Ma et al [15], and Martin et al [16] only focused on rockbolts without free end slip and ignored the slip of the bolt free end. Recently, Biscaia et al [17] analyzed the mechanism behavior and debonding process of the FRP-to-concrete interface on shear tests with the FRP plate submitted to a tensile load in one of its ends, three linear and one exponential bond-slip models are employed in the numerical process, and the results are analyzed and compared.…”

Section: Introductionmentioning

confidence: 99%

“…Wu et al [13] analyzed the crack propagation of the anchoring system by using the double-bilinear shear-lag model, which does not consider the impact of friction section. Ren et al [14] presented an analytical solution for predicting the full-range behavior of grouted rockbolts in tension. A trilinear bond-slip model was again considered for the rockbolt-cement grout joint interface, the model parameters are calibrated by identifying the different stages of load-displacement curves at the loading end.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Experimental Study on Bond‐Slip Behavior of Bamboo Bolt‐Modified Slurry Interface under Pull‐Out Load

Zhao

Xiaofei

et al. 2018

Advances in Civil Engineering

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is paper presents an analysis of bamboo bolt-modified slurry interfaces based on 26 in situ axial pull-out tests intended to highlight the mechanical behavior of interface under a fracture mode. ree impact factors are analyzed: anchorage length, bolt diameter, and bolt hole diameter, using the same materials of bamboo and modified slurry. e result shows that the interface between the bamboo bolt and anchoring agent is the control interface of an anchorage system, and the local behavior of the interface involves four stages: elastic, soften, friction, and decoupling. Distribution law and change trend of slippage, stress, and strain of anchoring interface along with the axial direction of an anchor bolt were analyzed. e result shows that there is effective anchoring length limit in this kind of interface, and that the complete decoupling phenomenon should not be neglected. rough a comparative analysis of the existing bond-slip model and interface bond-slip curve, and considering the correspondence of the strain-slip curve and trilinear bond-slip model simultaneously, a modified trilinear bond-slip model has been proposed. e friction section of this model is limited, and shearing stress in the complete decoupling section is zero.

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supporting

confidence: 58%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Experimental Study on Bond‐Slip Behavior of Bamboo Bolt‐Modified Slurry Interface under Pull‐Out Load

Zhao

Xiaofei

et al. 2018

Advances in Civil Engineering

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“…Now that no specification is available for different new anchor rods in earth relics protection due to diversified destruction modes of earth relics and complexity of engineering technology conditions, it is urgent to guide reinforcing design and construction with a complete detailed anchor rod research document [4,5]. Now application problems of the anchoring technology in earth relics protection are described as follows [6][7][8][9][10]:…”

Section: Introductionmentioning

confidence: 99%

Experimental Research on Destruction Mode and Anchoring Performance of Carbon Fiber Phyllostachys pubescens Anchor Rod with Different Forms

Yulan

Zhao

et al. 2018

Advances in Civil Engineering

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e anchoring technology is extensively applied in reinforcing protection of the earth relics. Now that no specification is available for different new anchor rods in earth relics protection due to diversified destruction modes of earth relics and complexity of engineering technology conditions, it is urgent to guide reinforcing design and construction with a complete detailed anchor rod research document. With the new carbon fiber Phyllostachys pubescens anchor rod as the research object, six lots of in situ tests are designed to, respectively, study the destruction mode and anchoring performance of the carbon fiber Phyllostachys pubescens anchor rod under different anchor length L, anchor rod diameter D, bore diameter H, grouting material S, rib spacing R, and inclination angle A in this paper. By studying load shift curve experiment in drawing of the anchor rod, the destruction mode and ultimate bearing capacity of the carbon fiber Phyllostachys pubescens anchor rod in different experiment lots are obtained, and the concept of permitted application value N in anchor rod design is proposed. By studying strain distribution characteristics of anchor rods in experimental lots along the length direction under action of the permitted application value N and combining the existing destruction mode and ultimate bearing capacity, this paper analyzes influences of L, D, H, S, R, and A on anchoring effect of the carbon fiber Phyllostachys pubescens anchor rod; gives the reasonable value range of L, D, H, and R when the carbon fiber Phyllostachys pubescens anchor rod is used for reinforcing design of the earth relics; and provides favorable experiment basis for reinforcing design of the earth relics based on the carbon fiber Phyllostachys pubescens anchor rod.

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Investigation on the pullout bearing properties and stress characteristics of fully grouted bolts in layered rock mass

Du,

Zhang,

Feng

et al. 2024

Energy Science & Engineering

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Coal‐measure strata is a typical layered structure, a better understanding of the bearing characteristics of fully grouted bolts in layered rock mass is of great significance for roadway support. However, limited studies have been conducted to investigate the bearing performance of fully grouted bolts in layered rock mass. In this paper, a numerical model of fully grouted bolt in layered rock mass was established, and a tri‐linear bond–slip model of the anchorage interface was imported into the numerical model by the user‐defined Fish language. The effects of strata sequence, strata thickness, and strata number in layered rock mass on the bearing performance of fully grouted bolts were systematically analyzed. The results show that fully grouted bolts in soft–hard type (SH‐type) layered rock mass has higher bearing capacity. The greater the thickness of the soft rock in the layered rock mass, the more significant the influence of the strata sequence on the bearing performance of fully grouted bolts. The bearing capacity of fully grouted bolts decreases with the increase of the thickness ratio of soft rock to hard rock. The greater the thickness of the hard rock in the layered rock mass, the more beneficial to the bearing performance of fully grouted bolts. With the increase of the strata number, the bearing capacity of fully grouted bolts gradually decreases. For bolt support of layered rock mass, the deep anchoring foundation of fully grouted bolts should be arranged in hard rock or elastic zone rock as much as possible, and rock grouting can be adopted to reduce the difference in mechanical properties between layered rock mass and improve the durability of fully grouted bolts. The research results may provide useful guidance and reference for the support design of fully grouted bolts.

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An analytical analysis of the full-range behaviour of grouted rockbolts based on a tri-linear bond-slip model

Cited by 240 publications

References 14 publications

Experimental Study on Bond‐Slip Behavior of Bamboo Bolt‐Modified Slurry Interface under Pull‐Out Load

Experimental Study on Bond‐Slip Behavior of Bamboo Bolt‐Modified Slurry Interface under Pull‐Out Load

Experimental Research on Destruction Mode and Anchoring Performance of Carbon Fiber Phyllostachys pubescens Anchor Rod with Different Forms

Investigation on the pullout bearing properties and stress characteristics of fully grouted bolts in layered rock mass

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