Determination of the bond–slip relationship of fully grouted rockbolts

Ma, Shuqi; Zhu, Xing; Qin, Weiwei; Hu, Shugang

doi:10.1007/s12665-018-7495-2

Cited by 17 publications

(6 citation statements)

References 27 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…e test results were in accordance with the nonlinear bond-slip relationship. Further, Martin et al [34,35] and Ma et al [36] pointed out the bond-slip relationship is the constitutive law of blotgrout interface, which is independent on the embedment length. In other words, the bond interface has the same bond-slip relationship when subjected to the same conditions (such as the same installing procedure, rock bolt, grout, surrounding rock masses, and the same geological condition) under different anchor lengths.…”

Section: Bond Slip Relationship Of Bond Interfacementioning

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

View full text Add to dashboard Cite

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.

show abstract

Section: Bond Slip Relationship Of Bond Interfacementioning

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

View full text Add to dashboard Cite

show abstract

“…At the same time, the rock bolts inhibit the further deformation of the rock mass and reach the final equilibrium state [5][6][7][8][9]. To study the load transfer mechanism between the rock bolts and surrounding rock, it is necessary to study the bond slip relationship of anchoring interface [10][11][12][13]. Many scholars have conducted theoretical study and numbers of indoor pullout tests and have proposed many models to describe the bond slip relationship of anchoring interface.…”

Section: Introductionmentioning

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

View full text Add to dashboard Cite

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.

show abstract

“…With this ratio increasing, the critical EL also increased. Ma et al [15] compared the reinforcement performance of rock bolts when the EL increased from 100 mm to 300 mm. They found that with the EL increasing, the rock bolts were likely to show yielding behaviour under the PO environment.…”

Section: Introductionmentioning

confidence: 99%

Investigating the Influence of Embedment Length on the Anchorage Force of Rock Bolts with Modified Pile Elements

et al. 2022

View full text Add to dashboard Cite

The embedment length (EL) of full-grouting rock bolts is a core factor in rock bolt reinforcement. Therefore, understanding the influence of EL on the reinforcement performance of rock bolts benefits the rock reinforcement quality. To realise this purpose, this paper adopted the numerical modelling method. In this numerical modelling method, the structural elements of modified piles were used. The elastic debonding law was incorporated into the modified pile elements to model the debonding behaviour of the surface between rock bolts and grout. The results showed that the sliding of modified pile elements had a marginal influence on the reinforcement performance of rock bolts. Moreover, the EL has a paramount influence on the reinforcement performance of rock bolts. Before the rock bolts reached the largest anchorage force, there was a linear relation between the largest anchorage force and the EL. It was effective to use the linear regression analysis method to predict the critical EL of rock bolts. This finding was also applicable to fibre-reinforced polymer (FRP) rock bolts. Additionally, the rock bolt type had a paramount influence on the reinforcement performance of rock bolts. Before the rock bolts reached the largest anchorage force, metal rock bolts showed much larger initial stiffness than FRP rock bolts.

show abstract

Determination of the bond–slip relationship of fully grouted rockbolts

Cited by 17 publications

References 27 publications

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

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

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

Investigating the Influence of Embedment Length on the Anchorage Force of Rock Bolts with Modified Pile Elements

Contact Info

Product

Resources

About