Centrifuge model studies on anchored geosynthetic slopes for coastal shore protection

Rajabian, A.; Viswanadham, B. V. S.; Ghiassian, H.; Salehzadeh, Hossein

doi:10.1016/j.geotexmem.2012.06.001

Cited by 33 publications

(7 citation statements)

References 19 publications

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“…For example, the prestressed anchor can improve the stress distribution of the slope [8]. Anchored geosynthetics can improve slope stability and deformation behavior [9]. In addition, the antislide pile [10][11][12][13][14] and soil nail [15] are proved to be good slope reinforcement methods.…”

Section: Introductionmentioning

confidence: 99%

Sensitivity of Multistage Fill Slope Based on Finite Element Model

Yuan

et al. 2021

Advances in Civil Engineering

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Based on the strength reduction method, the laws of slope displacement and the changing positions of the sliding surface during the filling process are studied. The model of multistage fill slope is established by the finite element software PLAXIS. The difference is compared between the slope with no reinforcement and with reinforcement under the same working condition. Sensitivity analysis is carried out from two aspects which are internal factors and external factors. The finite element analysis shows that the settlement of the multistage fill slope with no reinforcement is mainly concentrated on the right side of the slope and gradually decreases with the increase of the filling height. The position of the sliding outlet is located at the joint of the first and the second grade of the slope. The effect of the reinforcement on the sliding surface is ideal. It is obvious that the reinforcement can supply the slope with a better position of the sliding surface, which is beneficial to the stability of the slope. The sensitivity analysis shows that unit weight, ratio of slope, and height of each grade are negatively correlated with the safety factor. At the same time, the platform width, cohesion, and internal friction angle are positively correlated with the safety factor. The internal friction angle has the greatest influence on the stability of the slope. Besides, the platform width and the height of each grade should be controlled at about 4 m. The sensitivity analysis provides a reference for the design of the multistage filling slope.

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Section: Introductionmentioning

confidence: 99%

Sensitivity of Multistage Fill Slope Based on Finite Element Model

Yuan

et al. 2021

Advances in Civil Engineering

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“…As a consequence, centrifugal model testing has important advantages in researching landslide deformation because of the reproduction of the gravity stress field [22,23]. It is a widely held view that centrifugal model tests have a good effect on exploring the infiltration of rainwater and the deformation mechanism of rainfall-induced landslides [24][25][26].…”

Section: Introductionmentioning

confidence: 99%

Centrifuge Modeling and the Analysis of Ancient Landslides Subjected to Reservoir Water Level Fluctuation

Tang

et al. 2020

Sustainability

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Landslides are among the most severe natural hazards with significant impacts in human life and infrastructure. The Three Gorges Reservoir Area (TGRA) is vulnerable to landslides because of the geological environment and human activities. A centrifuge model test of a landslide with a planar sliding surface in the TGRA was conducted. Based on the multiple monitoring systems composed of a 3D laser scanner, pore water pressure transducers, particle image velocimetry and earth pressure sensors, multiphysical data were obtained. The work described here had the objective of researching the long-term deformation pattern of this kind of landslide that was subjected to periodic fluctuations in the reservoir water level. The results indicated that the failure processes were characterized by progressive retrogression and cracks caused by the reservoir drawdown. Transverse tensile cracks first appeared in the submerged zone of the slope. The front part of the slope was dominated by horizontal displacement, while the consolidation and compaction deformation in the vertical direction dominated at the mid-rear part of the slope. When the water level dropped again, the front part slid down and fell into the river, but the mid-rear part had no obvious deformation and exhibited a phenomenon of self-stabilization. Moreover, the phreatic line is a concave shape directed into the slope during reservoir filling and converts to a convex shape pointing out of the slope during reservoir drawdown. The earth pressures in the slope vary with the failure process of the landslide. Good agreement is obtained for the deformation characteristics between the experimental results and those of prototype landslides.

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“…Besides the comparison of slope conditions before and after a centrifuge test, exact and real-time deformation data during centrifugal force loading are also critical parameters, revealing far greater detail about the slope instability mechanisms. Traditional methods that trace the deformation are usually accomplished through surveillance cameras and plastic markers embedded in the slope surface (Raisinghani and Viswanadham, 2011;Rajabian et al, 2012); however, they cannot provide specific and real-time deformation data. Electromagnetic sensors, such as displacement gauge, earth pressure cell and osmometer are also used in centrifugal model testing, but these electromagnetic sensing elements often output weak voltage signals that are vulnerable to magnetic interference, complex wiring schemes that do not conform to narrow volume of centrifugal tanks.…”

Section: Introductionmentioning

confidence: 99%

Fiber Bragg grating sensor-based monitoring strategy for slope deformation in centrifugal model test

Guo

Fu²,

et al. 2019

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Purpose Centrifugal model tests can accelerate the characterization of landslides and demonstrate the form of slope failure, which is an important measure to research its instability mechanisms. Simply observing the slope landslide before and after a centrifugal model test cannot reveal the processes involved in real-time deformation. Electromagnetic sensors have severed as an existing method for real-time measurement, however, this approach has significant challenges, including poor signal quality, interference, and complex implementation and wiring schemes. This paper aims to overcome the shortcomings of the existing measurement methods. Design/methodology/approach This work uses the advantages of fiber Bragg grating (FBG) sensors with their small form-factor and potential for series multiplexing in a single fiber to demonstrate a monitoring strategy for model centrifugal tests. A slope surface deformation displacement sensor, FBG anchor sensor and FBG anti-slide piling sensor have been designed. These sensors are installed in the slope models, while centrifugal acceleration tests under 100 g are carried out. Findings FBG sensors obtain three types of deformation information, demonstrating the feasibility and validity of this measurement strategy. Originality/value The experimental results provide important details about instability mechanisms of a slope, which has great significance in research on slope model monitoring techniques and slope stability.

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Centrifuge model studies on anchored geosynthetic slopes for coastal shore protection

Cited by 33 publications

References 19 publications

Sensitivity of Multistage Fill Slope Based on Finite Element Model

Sensitivity of Multistage Fill Slope Based on Finite Element Model

Centrifuge Modeling and the Analysis of Ancient Landslides Subjected to Reservoir Water Level Fluctuation

Fiber Bragg grating sensor-based monitoring strategy for slope deformation in centrifugal model test

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