Action of fully-grouted bolts in jointed rock and factors of influence

Spang, K; Egger, P.

doi:10.1007/bf01022954

Cited by 157 publications

(47 citation statements)

References 3 publications

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“…Ge and Liu [11] discussed the influence of the bolt on the joint and the mechanism behind the dowel effect via laboratory simulation tests and theoretical analyses in bolted joints and proposed a modified shear stress formulation for a bolted joint. Spang and Egger [12] conducted a series of shear tests in a bolted joint to study the deformation characteristics of a bolt and found two critical points in a bolt: one at the bolt-joint intersection and the other at the hinge point. Egger and Zabuski [13] found that the anchoring mechanism of a bolt in a reinforced joint contributes additional shear resistance to prevent the shear failure of a joint.…”

Section: Introductionmentioning

confidence: 99%

Macro-Micro Failure Mechanisms and Damage Modeling of a Bolted Rock Joint

Wang

Zhang

Jiang

et al. 2017

Advances in Materials Science and Engineering

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The anchoring mechanism of a bolted joint subjected to a shear load was investigated using a bilinear constitutive model via the inner-embedded FISH language of particle flow code based on the discrete element method. The influences of the anchoring system on the macro-/micromechanical response were studied by varying the inclination angle of the bolt. The results indicate a clear relationship between the mechanical response of a bolted rock joint and the mechanical properties of the anchoring angle. By optimizing the anchorage angle, the peak strength can be increased by nearly 50% relative to that at an anchorage angle of 90 ∘ . The optimal anchorage angle ranges from 45 ∘ to 75 ∘ . The damage mechanism at the optimal anchorage angle joint is revealed from a macroscopic mechanical perspective. The concentration of the contact force between disks will appear in the joint and around the bolt, resulting in crack initiation. These cracks are mainly tensile cracks, which are consistent with the formation mechanism for compression-induced tensile cracks. Therefore, the macroscopic peak shear stress in the joint and the microscopic damage to the anchoring system should be considered when determining the optimal anchoring angle to reinforce a jointed rock mass.

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Section: Introductionmentioning

confidence: 99%

Macro-Micro Failure Mechanisms and Damage Modeling of a Bolted Rock Joint

Wang

Zhang

Jiang

et al. 2017

Advances in Materials Science and Engineering

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“…Bolt reinforcement is effective and prevalent for slope stabilization, which comprises the installation of tensioned (prestressed) anchor cables or fully grouted and untensioned dowels (bolts) (Aydan et al 1987;Bjurstrom 1974;Ceng et al 2003;Chen and Egger 1999;Chen et al 2009;Hanna 1982;Jalalifar et al 2006;Littlejohn and Bruce 1977;Ma and Chang 2007;Post-Tensioning Institute 2004;Spang and Egger 1990;Xanthakos 1991). Factors that will influence the selection of an appropriate reinforcement system for the slope include the site geology, the required capacity of the reinforcement force, drilling equipment availability and access, and time permitted for the installation.…”

Section: Bolt Reinforcementmentioning

confidence: 99%

Rock Slopes in Hydraulic Projects

Chen

2015

Hydraulic Structures

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“…Egger and Fernandez's (1983) shear test on concrete blocks found that shear displacements at failure were minimal for bolt inclinations between 40°and 50°. Spang and Egger (1990) conducted extensive shear tests on different materials including, granite, concrete and sandstone. Parameters examined include, bolt inclination, joint surface roughness, and medium strength.…”

Section: Introductionmentioning

confidence: 99%

The effect of surface profile, rock strength and pretension load on bending behaviour of fully grouted bolts

2006

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Fully encapsulated rock bolting has, in recent years, become a universally accepted system of ground reinforcement in mining and tunnel construction. The application of bolting systems extends both to rebar as well as cable bolting. The effectiveness of the bolt application has been studied in shear, both by laboratory tests as well as by numerical modeling. A specially constructed double shearing apparatus (DSA) was used to examine the shearing behaviour of a bolt installed perpendicularly across two joints. The experimental study was complemented with three-dimensional numerical analysis. Parameters examined include, the effect of reinforced material on tension/compression zones along the sheared bolt, shear resistance, shear displacement and induced strains and stresses during bolt bending process. The study was undertaken at both free load and pretension conditions. The conclusions drawn from the study were the level of bolt resistance to shear was influenced by bolt profile configuration, the strength of the rock or medium influenced the level of load generated on the bolt and the increased bolt pretension contributed to increased shearing load of the bolted medium. The numerical simulation of the bolt/medium interaction and deformational behaviour were found to be in close agreement with the experimental test results.

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Action of fully-grouted bolts in jointed rock and factors of influence

Cited by 157 publications

References 3 publications

Macro-Micro Failure Mechanisms and Damage Modeling of a Bolted Rock Joint

Macro-Micro Failure Mechanisms and Damage Modeling of a Bolted Rock Joint

Rock Slopes in Hydraulic Projects

The effect of surface profile, rock strength and pretension load on bending behaviour of fully grouted bolts

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