A theoretical approach for analysis of the interaction between grouted rockbolts and rock masses

Fahimifar, Ahmad; Soroush, Hamed

doi:10.1016/j.tust.2004.12.005

Cited by 58 publications

(26 citation statements)

References 9 publications

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“…More recently, Li and Stillborg [11] introduced the notion of "decoupling front" and presented an analytical model through pull-out test; the model considered the decoupling mechanism, and the shear stress is assumed to be zero when the interface is completely decoupled. Fahimifar and Soroush [12] analyzed the interface interaction between grouting bolt and rock mass by using brittle behavior model and strain-softening behavior model. 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.…”

Section: Introductionmentioning

confidence: 99%

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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Section: Introductionmentioning

confidence: 99%

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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“…extended the general solutions based on the Mohr-Coulomb criterion and developed an elastic-brittle plastic model [13]. Fahimifar and Soroush (2005) presented a new approach based on non-linear strength criterion for rock mass and the brittle and strain softening stressstrain behavior models [14]. Carranza-Torres (2009) analyzed the mechanical contribution of rockbolts reinforcement based on elastoplastic model and proved that rockbolts can also have a critical effect in controlling the extent of the plastic failure zone and the convergences of the tunnel [15].…”

Section: Introductionmentioning

confidence: 99%

Analytical and Reliability Study of the Tunnel with Rockbolts in Rock Masses

Meng¹,

Zhao²,

Zhu³

et al. 2018

Period. Polytech. Civil Eng.

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IntroductionRockbolts have been widely used to reinforce the surrounding rock mass in tunnel engineering. A proper design of rockbolts, which depends on the full understanding of the mechanism and effectiveness of rockbolts, is very important to reinforcement, stabilization and safety construction of rock tunnel [1][2][3]. Meanwhile, there are lots of uncertainties in rock tunnel. Uncertainties are critical to design and safety construction due to the complexity of rock mass [4]. Reliability analysis is a widely developed method to determine the uncertainty in engineering system [5]. The stresses and displacements around tunnel is an important problem considering the uncertainty in tunnel engineering.Various analytical, experimental, and numerical methods have been developed to analyze and understand the mechanism of rockbolts in tunnel based on different assumptions and conditions. Analytical models are able to define the stresses and the deformations and have been widely used due to the computational simplicity [6,7]. Hoek and Brown (1980) had presented analytical solutions of tunnel with rockbolts [8]. Brown et al (1983) proposed an analytical solution based on elastic-brittle-plastic material behavior and Hoek-Brown yield criterion [9]. Li and Stillborg (1999) developed three analytical models for rockbolts based on the mechanical coupling at the various interface of the rockbolts, the grout medium and the rock mass

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“…The theoretical study of fully grouted rockbolts as a stabilizing system of tunnels has been of considerable attention during the last decades . A number of solutions, which take the interaction between the bolt and the rock mass into account, have been based on the assumption that the contribution of bolt to the rock mass is in the form of a radial pressure within the influence domain of each bolt . However, all of these efforts treated the radial pressure as a uniform value, which is not the case in practice.…”

Section: Introductionmentioning

confidence: 99%

Analytical‐numerical solution for stress distribution around tunnel reinforced by radial fully grouted rockbolts

Ranjbarnia

Oreste

Fahimifar

et al. 2016

Num Anal Meth Geomechanics

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Summary This paper presents an analytical‐numerical approach to obtain the distribution of stresses and deformations around a reinforced tunnel. The increase in the radial stress of the reinforced tunnel, based on the performance of a bolt, is modeled by a function, which its maximum value is in the vicinity of the bolt periphery and it exponentially decreases in the far distance from the bolt. On the basis of this approach, the shear stiffness between the bolt and the rock mass and the shear stress distribution around the bolt within the rock mass are also analytically obtained. The results are compared with those obtained by the assumption of ‘uniform increase of radial stress’ method, which is made by the previous studies. The analyses show when the bolts' spacing is large, the safety factor must be increased if the ‘uniform increase of radial stress’ method is used for the design. Finally, a procedure is introduced to calculate the non‐equal deformation of the rock mass between the bolts at any radius that can be useful to compute the bending moment in shotcrete layer in New Austrian Tunnelling Method (NATM) approach. Copyright © 2016 John Wiley & Sons, Ltd.

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A theoretical approach for analysis of the interaction between grouted rockbolts and rock masses

Cited by 58 publications

References 9 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

Analytical and Reliability Study of the Tunnel with Rockbolts in Rock Masses

Analytical‐numerical solution for stress distribution around tunnel reinforced by radial fully grouted rockbolts

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