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Full-scale pullout tests of rock anchors in a limestone quarry focusing on bond failure at the anchor-grout and grout-rock interfaces

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Journal of rock Mechanics and Geotechnical Engineering 2023年第9期15卷 2264-2279页

作者： Bjarte Grindheim Charlie CLi Are Håvard Høien Department of Geoscience and Petroleum Norwegian University of Science and Technology(NTNU)TrondheimNorway Norwegian Public Roads Administration(NPRA) BergenNorway

rock anchors are a common safety measure for stabilising large-scale infrastructure,such as bridge towers,retaining walls,rock slopes and *** are four principal failure modes for rock anchors:(a)tensile failure of the steel anchor,(b)anchor-grout interface failure,(c)grout-rock interface failure,and(d)rock mass *** tests were performed in a limestone *** tests were designed to test failure modes B and C through *** the tests of failure mode B,the shear stress on the anchor-grout interface is the largest at the top of the grout column and attenuates towards the distal end for small *** shear stress becomes uniformly distributed when the applied load is approximately 50%of the ultimate pullout *** anchors designed to test failure mode C were installed with an endplate and had a higher toughness than the straight bar *** shear stress on the grout-rock interface is the largest at the endplate and attenuates upward before slip starts along the *** the ultimate pullout load is reached,and the grout column starts to slip,the shear stress is approximately *** bond shear strength on the anchor-grout interface was approximately 20%of the uniaxial compressive strength of the grout,and the bond strength of the grout-rock interface was around 5%for that of the *** grout-rock interface is likely determined by whichever is weaker,the grout or the rock.

关键词： rock anchor Load transfer Shear stress distribution Bond shear strength Field test

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Testing and modeling of cyclically loaded rock anchors

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Journal of rock Mechanics and Geotechnical Engineering 2017年第6期9卷 1010-1030页

作者： Joar Tistel Gustav Grimstad Gudmund Eiksund Department of Civil and Transport Engineering Faculty of EngineeringScience and TechnologyNorwegian University of Science and Technology(NTNU)TrondheimNorway

The Norwegian Public Roads Administration(NPRA) is planning for an upgrade of the E39 highway route at the westcoast of Norway. Fixed links shall replace ferries at seven fjord crossings. Wide spans and large depths at the crossings combined with challenging subsea topography and environmental loads call for an extension of existing practice. A variety of bridge concepts are evaluated in the feasibility study. The structures will experience significant loads from deadweight, traffic and environment. anchoring of these forces is thus one of the challenges met in the project. Large-size subsea rock anchors are considered a viable alternative. These can be used for anchoring of floating structures but also with the purpose of increasing capacity of fixed structures. This paper presents first a thorough study of factors affecting rock anchor bond capacity. Laboratory testing of rock anchors subjected to cyclic loading is thereafter presented. Finally, the paper presents a model predicting the capacity of a rock anchor segment, in terms of a ribbed bar, subjected to a cyclic load history. The research assumes a failure mode occurring in the interface between the rock anchor and the surrounding grout. The constitutive behavior of the bonding interface is investigated for anchors subjected to cyclic one-way tensile loads. The model utilizes the static bond capacity curve as a basis, defining the ultimate bond sbuand the slip s1 at τ. A limited number of input parameters are required to apply the model. The model defines the bond-slip behavior with the belonging rock anchor capacity depending on the cyclic load level(τcy/τ), the cyclic load ratio(R= τcy/τcy), and the number of load cycles(N). The constitutive model is intended to model short anchor lengths representing an incremental length of a complete rock anchor.

关键词： rock anchor rock bolt Bond-slip model Cyclic loading Empirical model Laboratory testing Bond degradation

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Monotonic uplift behavior of anchored pier foundations in soil overlying rock

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2023年第7期24卷 569-583页

作者： Yizhou SUN Honglei SUN Chong TANG Yuanqiang CAI Feng PAN College of Civil Engineering and Architecture Zhejiang UniversityHangzhou 310058China College of Civil Engineering Zhejiang University of TechnologyHangzhou 310014China State Key Laboratory of Coastal and Offshore Engineering Dalian University of TechnologyDalian 116024China Zhejiang Electric Power Design Institute Co.Ltd. China Energy Engineering GroupHangzhou 310012China

rock-embedded foundations with good uplift and bearing capacity are often used in mountains or hilly ***,there are soil layers with a certain thickness on the rocks in these mountainous areas,and the utilization of those soil layers is a problem worthy of attention in foundation *** construction-and cost-related factors,traditional single-form foundations built on such sites often cannot provide sufficient resistance against ***,an anchored pier foundation composed of anchors and belled piers,specifically constructed for such conditions,can be invaluable in *** paper introduces an experimental and analytical study to investigate the uplift capacity and the uplift mobilization coefficients(UMCs)of the anchored pier *** this study,three in-situ monotonic pullout tests were carried out to analyze the load–displacement characteristics,axial force distribution,load transfer mechanism,and failure mechanism.A hyperbolic model is used to fit the load–displacement curves and to reveal the asynchrony of the ultimate limit states(ULSs)of the anchor group and the belled *** on the results,the uplift capacity can be calculated by the UMCs and the anchor group and pier uplift ***,combined with the estimation of the deformation modulus of the soil and rock,the verification calculation of the uplift capacity and UMC was carried out on the test results from different anchored pier foundations.

关键词： Uplift capacity anchored pier foundation Belled pier rock anchor Uplift mobilization coefficient(UMC)

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