A constitutive law for bond failure of fully-grouted cable bolts using a modified hoek cell

Hyett, A. J.; Bawden, W.F.; Macsporran, G.R.; Moosavi, M.

doi:10.1016/0148-9062(94)00018-x

Cited by 97 publications

(39 citation statements)

References 12 publications

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“…Dans le but de mieux maîtriser le processus de transfert de charge entre le soutènement et le terrain, le comportement des interfaces barre-scellement et scellement-terrain doit être bien compris. Dans cette recherche, on s'intéresse à l'interface barre-scellement parce que l'expérience montre qu'elle est souvent moins résistante que l'interface scellement-terrain, en particulier dans le domaine des milieux rocheux (Hyett et al, 1995 ;Kaiser et al, 1992 ;Moosavi et al, 2005 ;Pakalnis et al, 1994 ;Reichert et al, 1992 ;Stillborg, 1986).…”

Section: Introductionunclassified

“…Par ailleurs, la validité de ce modèle empirique est limitée aux cas de faibles longueurs d'ancrage. Hyett et al (1995) ont proposé une loi d'interface complète, incluant les réponses normale et tangentielle à l'interface, pour des câbles standard à 7 torons scellés au coulis de ciment. Cette loi d'interface est basée sur des aspects théoriques et empiriques.…”

Section: Introductionunclassified

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Boulonnage à ancrage réparti : étude de l’interface barre-scellement sous sollicitations axiales

et al. 2016

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Résumé -Dans cet article, nous étudions l'interface barre-scellement du boulonnage/câblage à ancrage réparti. L'application d'un effort de traction sur la barre permet d'examiner le phénomène de décohésion de l'interface. Des études expérimentales et théoriques ont été menées, en conditions statiques. Les études théoriques sont utiles pour convertir les variables observables dans les matériaux environnants (barre, scellement, terrain) en variables d'interface, non accessibles directement. Les études expérimentales, effectuées en laboratoire et in situ, permettent de déterminer les facteurs les plus influents sur la réponse de l'interface. La combinaison de ces deux études constitue une méthode d'accès à la réponse de l'interface barre-scellement. Un exemple d'application de la nouvelle méthode est détaillé pour une configuration en laboratoire. L'analyse de plusieurs interfaces suggère que la réponse tangentielle n'est pas seulement due au frottement et que la réponse radiale dépend fortement du profil de la barre.Mots clés : Boulonnage à ancrage réparti / interface barre-scellement / approche analytique / essai d'arrachement / formulation semi-empirique / modèle d'interface Abstract -Fully grouted bolts: assessment of the bolt-grout interface response under axial loads. In this paper, we investigate the bolt-grout interface of fully grouted bolts. To study the interface debonding process, an axial tensile load is applied on the bar. Experimental and theoretical investigations have been conducted, in static conditions. The theoretical studies allow converting the variables measured in the surrounding materials (bolt, grout, ground) in interface variables, which cannot be measured directly. The experimental studies have been carried out at laboratory and field scales. They are useful to determine the most influencing parameters on the interface response. The combination of the theoretical developments with the experimental results leads to a method to access the bolt-grout interface response. An application example of the new method is detailed for a laboratory set-up. The analysis of several interfaces suggests that the tangential response is not only due to friction and that the normal response is highly dependent on the bolt profile.

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Section: Introductionunclassified

Boulonnage à ancrage réparti : étude de l’interface barre-scellement sous sollicitations axiales

et al. 2016

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“…Steel tube this kind of test measure was also widely adopted in early literatures [20,21]. It is surely that this testing measure can evaluate the bearing capacity of a bolting system; a specially designed sample that is able to sustain a large pullout load under laboratorial environment will undoubtedly provide better reinforcement to rock in practical trials.…”

Section: Samples Preparationmentioning

confidence: 99%

Pullout Test on Fully Grouted Bolt Sheathed by Different Length of Segmented Steel Tubes

Feng

Zhang

et al. 2017

Shock and Vibration

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In order to evaluate the anchorage performance of rebar bolt sheathed by different length of segmented steel tubes, a total of eight groups of pullout tests were conducted in this study. The steel tubes, segmented by 5 cm, 7 cm, 9 cm, 10 cm, and 15 cm, utilized in current study were bonded together by a high performance two-component adhesive to form standard 30 cm long steel tube. Unlike axial stress distribution in bolt, the axial stress distribution in steel tube showed exponential decrease trend from tube-clamp end to bolt-clamp end; thus a series of interesting results were observed. For instance, the sequence for segments detachment had its specific order of priority; the failure form of bolting system, the load oscillation characteristics, and the final displacement were highly determined by the length of the last segment, namely, the one fixed by clamp of testing machine. Moreover, the loaddisplacement relationship for some particular samples was further investigated from the perspective of energy transformation, and the disequilibrium extension of interfacial decoupling was also discussed. This paper, from a relatively idealized perspective, presents a laboratorial solution to interpret the mechanical performance of the bolt installed in layered strata; so far at least it demonstrates that a bolt installed in comparatively thicker layer of strata can last more durable and stable.

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“…The failure mode of anchor can divide into 4 types: yield failure due to low self-strength of rob; shear failure between rob and mortar due to the low adhesive strength; pullout failure caused by low mortar strength; shear failure between surrounding rocks [16][17]. Table 3 shows the failure mode of the GFRP anti-floating anchor under the maximum loading.…”

Section: Mode Of Failurementioning

confidence: 99%

The Model Test on the Anchoring Performance of GFRP Anti-Floating Anchor with Base Floor

Bai¹,

Zhang²,

Chen³

et al. 2017

dtmse

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ABSTRACT:In order to solve the external anchorage problem of GFRP (glass fiber reinforced plastics) anti-floating anchors, a new anchorage system-nutpallet anchorage was proposed. Based on self-designed pulling test indoor with large structure, external anchorage bearing behavior of nut-pallet anchorage of GFRP anti-floating anchors was studied. The external anchorage deformation (slippage) and the ultimate capacity were also monitored during the test. The results show that the failure modes of the GFRP anti-floating anchors are pulled out. Under the condition of C25 concrete and the GFRP anti-floating anchors diameter with 28 mm, other conditions remain unchanged, the anchorage length is only changed, the limit supporting capacity of the external anchorage length with 30d is 384 kN, the maximum slippage is 8.98 mm, the generalized efficiency coefficient of external anchorage is 0.890, the generalized average bond strength is 5.20 MPa; the limit supporting capacity of the external anchorage length with 15d is 267 kN, the maximum slippage is 5.13 mm, the generalized efficiency coefficient of external anchorage is 0.619, the generalized average bond strength is 7.24 MPa. The average bond strength between the GFRP anti-floating anchors and the concrete reduces along with the increase of external anchorage length. Under the counter-pulled loads of each level, the generalized average bond strength between the GFRP anti-floating anchors and the concrete reduces along with the increase of test sample both sides slippage quantity. Finally, the generalized average bond strength increasing rate decreases along with the increase of slippage quantity unceasing.

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A constitutive law for bond failure of fully-grouted cable bolts using a modified hoek cell

Cited by 97 publications

References 12 publications

Boulonnage à ancrage réparti : étude de l’interface barre-scellement sous sollicitations axiales

Boulonnage à ancrage réparti : étude de l’interface barre-scellement sous sollicitations axiales

Pullout Test on Fully Grouted Bolt Sheathed by Different Length of Segmented Steel Tubes

The Model Test on the Anchoring Performance of GFRP Anti-Floating Anchor with Base Floor

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