Centrifugal model test of deformation law under different reservoir water fluctuation rates: Muyubao landslide case study

In view of the settlement problem of high loess-filled embankments themselves, with the reference of the 30m high embankment at K5 +536 of Lan Lin provincial expressway and by means of the centrifugal model test, the developing process of the settlement for embankment itself with time in different sections of embankment and the distribution laws of the settlement subjected from spatial effect in case of the different terrain conditions are studied. Compared with the actual measurement, the results show that: as far as the settlement of high-filled embankment itself is concerned, the settlement at the central part along the cross-section of embankment is larger than that at shoulder; When the stability of embankment is relatively poor because of the bigger slope ratio or faster speed of construction, the settlement at the shoulder caused by the lateral extrusion from the edge of embankment is larger; The settlement of embankment itself is approximately 0.5% -1% of the height of embankment, about 75% -85% of which occurred during the construction period and the remaining 15% -25% belongs to after construction. Furthermore, the 85% of the settlement belong to after construction will be completed within a year and about two years later the settlement tend to be stable; Owing to the affection of the spatial effect due to the valley terrain conditions, the settlement near the joint sites between the embankment and the gully is larger than that occurred in gentle slope and the central part of embankment. During the time of designing and construction for high-filled embankment, the location where the settlement influenced by the lateral extrusion and spatial effect should be paid attention to, so that, the security and stability of the embankment could be ensured.

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Significance of centrifugal model test in soil mechanics

International Journal of Rock Mechanics and Mining Sciences & Geomechanics Abstracts ◽

10.1016/0148-9062(75)91278-4 ◽

1975 ◽

Vol 12 (5-6) ◽

pp. 73

Keyword(s):

Model Test ◽

Soil Mechanics ◽

Centrifugal Model Test ◽

Centrifugal Model

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Research On The Buttress-Warehouse Retaining Wall Based On Centrifugal Model Test

Proceedings of the 2017 3rd International Forum on Energy, Environment Science and Materials (IFEESM 2017) ◽

10.2991/ifeesm-17.2018.95 ◽

2018 ◽

Author(s):

Ying Nie ◽

Xuepeng Ling ◽

Fenghan Hu ◽

Qingsong Zhang ◽

Xiaofeng Zhao ◽

...

Keyword(s):

Model Test ◽

Retaining Wall ◽

Centrifugal Model Test ◽

Centrifugal Model

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Research on Application of Multi-Channel Selector in Centrifugal Model Test of Anchoring Slope by Frame Beam

Frontiers in Earth Science ◽

10.3389/feart.2021.757724 ◽

2021 ◽

Vol 9 ◽

Author(s):

Junhui Zhang ◽

Feng Li ◽

Shiping Zhang ◽

Jiankun Zhou ◽

Houming Wu

Keyword(s):

Model Test ◽

Effective Means ◽

Acquisition System ◽

Centrifugal Model Test ◽

Geotechnical Centrifuge ◽

Alpine Regions ◽

Sensor Signals ◽

One To One ◽

Centrifugal Model ◽

Centrifugal Test

An anchoring frame beam is a very common form of support for reinforced slopes, especially in alpine regions. Centrifugal tests have proved to be an intuitive and effective means of investigating the mechanism of action of frame beams. However, the data acquisition system of the geotechnical centrifuge in service has the problem of a small number of acquisition channels. A multi-channel selector based on the existing acquisition system was proposed, designed, processed, and manufactured, and it was debugged, tested, and applied in a no-load centrifugal test, static pressure model test, and centrifugal model test. The results show that the acquisition mode of the multi-channel selector connected with a maximum of 288 sensors has been changed from “one-to-one” to “one-to-many”. Its influence on various sensor signals is negligible. The multi-channel selector can work normally, which communicates and feeds back with the remote controller in the 1–120 g no-load centrifugal test. In the static load model test, 162 sensor signals were well collected through it. And only 51 channels were used to effectively obtain the signals of 187 sensors in a 70 g centrifugal model test of an anchoring slope with a frame beam. The multi-channel selector can be successfully applied in different use environments, saving time and reducing the cost of obtaining a single set of data.

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Bearing resistance property of diameter-expanded anchorage in sandy ground

E3S Web of Conferences ◽

10.1051/e3sconf/20199217003 ◽

2019 ◽

Vol 92 ◽

pp. 17003

Author(s):

Toshikazu Sawamatsu ◽

Takehiko Nitta ◽

Hiroaki Miyatake ◽

Masahide Otsubo

Keyword(s):

Spherical Particle ◽

Model Test ◽

Ground Deformation ◽

Spherical Particles ◽

Dem Simulation ◽

Centrifugal Model Test ◽

Pull Out ◽

Sandy Ground ◽

Model Set ◽

Centrifugal Model

Based on a past centrifugal model test and complementary discrete element method (DEM) simulation, this paper provides insights into bearing resistance of diameter-expanded anchorage with its anchor body expanded. In the centrifugal model test, an anchor body model set at a depth of 100 mm and a diameter of 27 mm in sand was pulled horizontally in a centrifugal acceleration of 30 G. The behaviour of the model ground during pulling was portrayed through the DEM modelling. Spherical particle and non-spherical particle composed of two spherical particles connected rigidly were used as analogues of soil particles in the simulation. The simulation result of spherical particle with inter-particle friction coefficient of 0.5 was similar to the ground deformation and the pull-out resistance obtained from the experiment.

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

Sensor Review ◽

10.1108/sr-10-2017-0218 ◽

2019 ◽

Vol 39 (1) ◽

pp. 71-77 ◽

Cited By ~ 3

Author(s):

Yongxing Guo ◽

Jianjun Fu ◽

Longqi Li ◽

Li Xiong

Keyword(s):

Fiber Bragg Grating ◽

Real Time ◽

Model Test ◽

Bragg Grating ◽

Monitoring Strategy ◽

Content Type ◽

Centrifugal Model Test ◽

Time Deformation ◽

Fbg Sensors ◽

Centrifugal Model

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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