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Modernized Resonant Column and Torsional Shearing Apparatus With Multipoint Contactless Displacement Detection System Cover

Modernized Resonant Column and Torsional Shearing Apparatus With Multipoint Contactless Displacement Detection System

Studia Geotechnica et Mechanica
Volume 45 (2023): Issue s1 (December 2023)
By: Marcin Bujko,  Marta Bocheńska,  Piotr Srokosz and  Ireneusz Dyka  
Open Access
|Oct 2023
Figures & tables

Figures & Tables

Figure 1:

Tested material (a) grain size distribution (b) microscopic image of tested sand's grains (Dyka, et al., 2017).

Figure 2:

The arrangement of magnets on the specimen's surface and Hall sensors on the internal cylinder (a) vertical (A-A) section; the middle dimension line refers to the placement of the Hall sensors and the right dimension line refers to the magnets, (b) horizontal (B-B) section [mm].

Figure 3:

Polycarbonate cylinder with Hall sensors installed on the surface (a) top view, (b) side view.

Figure 4:

The inside view of the communications interface.

Figure 5:

User Interface of the measurement system control software.

Figure 6:

The sand specimen covered with a latex membrane and magnets attached to the surface The main RC tests were carried out with the input parameters presented in Table 2.

Figure 7:

Influence of the torque amplitude on the resonant frequency of the specimen (light gray—0.02 V, medium gray—0.1 V, black—0.2 V).

Figure 8:

Influence of the subsequent loading cycles (test repetitions) on the resonant frequency value. The torque amplitude value is 0.2 V; black—first cycle; medium gray—second cycle; light gray—third cycle.

Figure 9:

Influence of the magnets’ installation on the resonant frequency. The torque amplitude is 0.2 V; black—the specimen without magnets; gray—the specimen with the magnets attached to the surface.

Figure 10:

Results of the TS test for amplitude of 5 V. Raw data from the Hall sensors during the TS test. The arrangement of the graphs corresponds with the location of the sensors.

Figure 11:

Results of one of the RC tests for the amplitude of 8 V. Raw data from the Hall sensors. The arrangement of the graphs corresponds with the location of the sensors.

The physical parameters of soil_

Soil typeGs [-]d50 [mm]d60 [mm]d10 [mm]CU [-]emax [-]emin [-]ρ [g/cm3]
silica sand2.650.330.410.143.00.680.411.86

The TS test input parameters_

Testing modep [kPa]f [Hz]A [V]n [-]
Torsional shearing500.025.03

RC test results_

RC test numberfr [Hz]γ [%]G [MPa]
1.145.450.006984.51
2.125.610.011662.88
3.115.480.014453.27
4.107.600.018546.18
5.101.010.024240.69
6.96.010.031236.73
7.88.810.038831.45
8.83.190.049127.60

The RC test input parameters_

Testing modeTest numberp [kPa]f0 [Hz]ff [Hz]A [V]
1. 1002001.0
Resonant column2.50801802.0
3.601603.0
4. 601604.0
5. 501505.0
6. 501506.0
7. 501507.0
8. 401408.0
DOI: https://doi.org/10.2478/sgem-2023-0018 | Journal eISSN: 2083-831X | Journal ISSN: 0137-6365
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Language: English
Page range: 382 - 394
Submitted on: Feb 26, 2023
Accepted on: Sep 11, 2023
Published on: Oct 8, 2023
Published by: Wroclaw University of Science and Technology
In partnership with: Paradigm Publishing Services
Publication frequency: 4 issues per year
Keywords:
resonant column,
noncohesive soil,
Hall effect sensors,
dynamic effects
Related subjects:
Geosciences,
Geosciences, other,
Materials sciences,
Composites,
Porous materials,
Physics,
Mechanics and fluid dynamics

© 2023 Marcin Bujko, Marta Bocheńska, Piotr Srokosz, Ireneusz Dyka, published by Wroclaw University of Science and Technology
This work is licensed under the Creative Commons Attribution 4.0 License.

Volume 45 (2023): Issue s1 (December 2023)
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