Effect of Soil Loading and Unloading on Its Acoustic Behavior

Frid, Vladimir; Potirakis, Stelios M.; Shulov, S. Ya.

doi:10.3390/asec2020-07516

Cited by 3 publications

(6 citation statements)

References 16 publications

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“…10 f). Note that this observation is consistent with the results of our earlier studies 37 , 38 (see Sect. “Discussion and conclusion”) as well as with the results presented by Hu et al 43 and Tanaka and Shirakawa 44 , 45 .…”

Section: Resultssupporting

confidence: 93%

“…The materials and methods used in the study are described in detail in our previous articles 37 , 38 , below we will only briefly consider these issues. The dune sand material for the study was collected in the coastal area of Ashdod (about 30 km south of Tel Aviv city, Israel).…”

Section: Methodsmentioning

confidence: 99%

“…The value of 5% of the water content is the experimentally found largest amount of water that can be absorbed by a sand sample without squeezing out the water during sample compaction 37 , 38 , (c) each cylindrical sand sample was prepared inside an elastic jacket/membrane and into a mold on the pedestal (Fig. 2 b) using a wet-tamping method 52 – 54 by using a hand-held tamper.…”

Section: Methodsmentioning

confidence: 99%

“…A close correspondence was found between the number of AE pulses, their energy, and the stress–strain state of the soil 31 . A concise review of AE caused by failure of soil samples was presented in 37 , 38 where the AE phenomenon was investigated using dry and wet sands of different grain content. It was shown that failure of granular materials associated with the AE in the frequency range of tens kHz while low-frequency diapason (< 20 kHz) provides information on the features of the shear zone while the higher range (> 30 kHz)—on stress release events 39 , 40 .…”

Section: Acoustic Emissionmentioning

confidence: 99%

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Acoustic emission induced by sand liquefaction during vibration loading

Frid

Shulov

2022

Sci Rep

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The article deals with the study of poorly graded sand samples of different grain content subjected to liquefaction. The research results show the V-shaped behavior of the AE parameters that correspond to the three-stage sand behavior: Phase A is associated with microfractures/displacements between sand grains caused by an increase in pore pressure before the liquefaction point. Phase B (the stage of AE silence just before the liquefaction point) reflects the equality between pore pressure and stress in the confining chamber. Phase C (the stage of increase in AE parameters’ values) is explained by intense friction between sand grains during their movement caused by liquefaction. Our results show that the AE behavior before, at, and after the liquefaction point is significantly affected by the sand grain content. The change in the sand composition from the poorly graded dune sand to "extremely poorly graded sand" significantly increases the time for the creation of the liquefaction state while the coarser the sand grains become, the longer duration of vibration loading is required to reach the liquefaction state.

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Section: Resultssupporting

confidence: 93%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Acoustic Emissionmentioning

confidence: 99%

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Acoustic emission induced by sand liquefaction during vibration loading

Frid

Shulov

2022

Sci Rep

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“…When a load or force is applied to a soil, its particles reorganize and compress [26,27], which can lead to microfractures or internal displacements [28] in the material that will release energy in the form of acoustic waves [29]. When these emissions are monitored, valuable information can be obtained about the evolution of soil deformation [28,30], changes in mechanical behavior [31,32], the location and propagation of microfractures [33], the presence of weaknesses or potentially unstable areas (of great importance for the safety assessment of structures built on the ground) [20], and, in general, the strength of the soil [29,34] to applied forces.…”

Section: Introductionmentioning

confidence: 99%

Multivariate Statistical and Correlation Analysis between Acoustic and Geotechnical Variables in Soil Compression Tests Monitored by the Acoustic Emission Technique

García-Ros,

Villalva-León,

Castro

et al. 2023

Mathematics

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In this research, a series of compression tests were carried out, under oedometric conditions, on sand samples prepared with different moisture contents. In these tests, in addition to the usual measurements of the stress and deformation of the sample, a series of acoustic emission sensors were used to monitor the parameters of the acoustic signals coming from inside the sample. This is a rather novel technique with great potential, but sometimes difficult to approach due to the large amount of acoustic emission data generated. In this paper, a correlation and regression analysis has been performed to quantify the correlations between the geotechnical variables and the parameters characterizing the acoustic emissions. The results presented open an interesting horizon of possibilities since, as it has been shown, it is possible to determine the values of the geotechnical properties from the acoustic variables, by means of the regression functions obtained for each type of soil or for each practical case. At the very least, this is a complementary tool in the determination of the mechanical properties of soils subjected to compression, although it could also be useful in those situations in which the monitoring of geotechnical variables describing the tenso-deformational behavior of the soil may be difficult or impossible.

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Study of Static and Dynamic Properties of Sand under Low Stress Compression

2021

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The aim of this work was to investigate a wide range of grain sizes of sand in the pre-yield regime during compression through the combined study of ultrasound (US) wave speed and acoustic emission (AE). The specific study was performed using modified oedometer and uniaxial compression experimental set-ups. The studied samples were natural dune sand (poorly graded on the poorly graded sand (SP) index) as well as its three extracted fractions as follows: 2.36–0.6 mm, 0.6–0.3 mm and 0.3–0.075 mm. The maximum compression stress during the modified oedometer experiments was <150 kPa, while during the modified uniaxial compression experiments, it was <400 kPa. Each sample was loaded while measuring the US pressure (P) wave speed and AE at each loading stage. The results show that the stiffer the soil is, the higher the value of the P wave speed measured, resulting in similar P wave velocity values achieved at a much lower applied stress during the oedometer experiments in comparison with the uniaxial compression tests. Regarding the AE results, it is seen that the higher the stress level is, causing more friction between the sand particles, the more AE events there are during their movement. The following parameters of AE were shown to be the most sensitive to the stress increase: the number of AE hits and the signals’ energy.

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Effect of Soil Loading and Unloading on Its Acoustic Behavior

Cited by 3 publications

References 16 publications

Acoustic emission induced by sand liquefaction during vibration loading

Acoustic emission induced by sand liquefaction during vibration loading

Multivariate Statistical and Correlation Analysis between Acoustic and Geotechnical Variables in Soil Compression Tests Monitored by the Acoustic Emission Technique

Study of Static and Dynamic Properties of Sand under Low Stress Compression

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