Numerical Simulation of a Ground Anchor Pullout Test Monitored with Fiber Optic Sensors

Fabris, Carla; Schweiger, Helmut; Pulko, Boštjan; Woschitz, Helmut; Racansky, Vaclav

doi:10.1061/(asce)gt.1943-5606.0002442

Cited by 18 publications

(5 citation statements)

References 22 publications

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“…Since only one sensor cable broke at the highest load during the pullout test in Ljubljana, the chosen optical sensor fibres proved to be sufficiently robust for this kind of application. Furthermore, the pullout tests in different subsoils provided measurement data that were and can be further used to improve the theoretical models of geotechnical ground anchors and in a further step to optimize the anchor length and relation between the free and fixed length [1], as well.…”

Section: Discussionmentioning

confidence: 99%

“…in excavation pits, tunnel constructions or at retaining walls. Although the dimension, design and test procedure of ground anchors is standardised in detail in EN 1997-1, EN 1537 and EN ISO 22477-5 within the European area, the load transfer behaviour is still not fully understood and anchor design usually relies on simplified assumptions [1]. Especially, the question if the load transfer only happens in the fixed length the anchor of even above, and the optimization of the anchoring length in different subsoils are of interest for the design of new anchors.…”

Section: Introductionmentioning

confidence: 99%

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Distributed fibre optic sensing during different anchor pullout tests

Woschitz

Winkler

Racansky³

2023

European Workshop on Optical Fibre Sensors (EWOFS 2023)

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Although ground anchors are widely used in fields of civil engineering, as in soil and rock stabilization or anchoring structures, such as excavation pits, retaining walls or tunnel constructions, the load transfer behaviour has not been entirely investigated yet. Ground anchors are usually monitored by load cells at the anchor head or by strain gauges at selected points along the anchor, which both do not deliver reliable information along the entire anchor. Distributed strain sensing provides an opportunity to get the strain information along the entire length of the anchor, on the tendons as well as in the grout, as we have already shown in a preliminary anchor test. However, there were still lots of issues, which did not allow a general conclusion for all anchor types and ground conditions. Thus we investigated further ground anchors in different soil conditions (clay, rocklike material and gravel), within a research project. This paper gives an overview of the sensor systems used, the obtained results of the anchor pullout tests, gathered experiences and finally gives a brief concept of a monitoring anchor for long term monitoring.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Distributed fibre optic sensing during different anchor pullout tests

Woschitz

Winkler

Racansky³

2023

European Workshop on Optical Fibre Sensors (EWOFS 2023)

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“…Cable 3 was used with the LUNA interrogator for the reference strain measurement. It is a commercially available fiber optic cable that is often used in civil infrastructure monitoring (Cola et al 2019;Rabaiotti et al 2017;Fabris et al 2021;Zhang, Liu, Coulibaly, et al 2020). Its design is much simpler than that of 10 Cable 1 and 2 as it is not designed to survive in harsh subsurface conditions where oil and gas wells are usually constructed.…”

Section: Distributed Fiber Optic Strain Sensing Interrogatorsmentioning

confidence: 99%

Distributed fiber optic strain sensing of bending deformation of a well mockup in the laboratory

Sasaki

Zhang

Soga

et al. 2021

Journal of Natural Gas Science and Engineering

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“…This method was used to analyze the interface properties of the anchorage section. To study the anchor’s load transfer mechanism in the pulling experiment, Fabris et al 20 precisely monitored the force and deformation of the entire anchor by installing an optical fiber sensor along the steel bar. The authors obtained the anchor’s load–displacement curve and crack development law in the pull-out test.…”

Section: Introductionmentioning

confidence: 99%

Analysis of force and displacement of anchor systems under the non-limit active state

Fang

Yan-peng

et al. 2022

Sci Rep

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This paper proposes a concept of soil shear strength exertion around an anchorage section to analyze and calculate the anchor’s force and displacement. First, based on the Mohr stress circle, the numerical relationship between the value of the internal friction angle exertion, the value of the cohesion exertion, and the displacement are established under the non-limit active state. According to the interaction mechanism between the anchorage section and the surrounding soil, this paper obtains the corresponding relationship between the value of the soil’s shear strength exertion and displacement under the non-limit active state. Then, according to the load transfer principle of the anchorage section, the basic differential equation is established. The differential equation of the relative displacement distribution along the length of the anchorage section under the non-limit active state is further derived. And the calculation and analysis formula of the shear stress and relative displacement in the anchorage section considering the process of the soil shear strength exertion is also obtained. Finally, this paper compares the calculation method with the hyperbolic model calculation method for the same example. The results verify the accuracy of the calculation method.

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Numerical Simulation of a Ground Anchor Pullout Test Monitored with Fiber Optic Sensors

Cited by 18 publications

References 22 publications

Distributed fibre optic sensing during different anchor pullout tests

Distributed fibre optic sensing during different anchor pullout tests

Distributed fiber optic strain sensing of bending deformation of a well mockup in the laboratory

Analysis of force and displacement of anchor systems under the non-limit active state

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