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Experimental Investigation of Dynamic Behavior of Silty Sand

Ryszard Chmielewski Leopold Kruszka Ryszard Rekucki Kamil Sobczyk
Archives of Civil Engineering | 2021 | vol. 67 | No 1 | 481-498 | DOI: 10.24425/ace.2021.136484
Keywords soil mechanics experimental dynamic testing split Hopkinson pressure bar oedometric test
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Abstract

The paper includes experimental research using the Split Hopkinson Pressure Bar to determine dynamic compression curves and strength dynamic parameters to depend on the strain rate and moisture for silty sand soil samples. Those experiments are oedometric type based in a rigid confining cylinder. Samples of silty sand with fine a fraction content were taken for the study. To ensure sufficiently uniaxial strain of the tested material, the soil samples were placed in properly prepared casings made of duralumin for the needs of the tests. Thanks to the use of measuring strain gauges on the initiating and transmitting bars, as well as the casing, the nature of the loading pulse was obtained, which was then subjected to the process of filtration and data processing to obtain the nature of the incident, reflected and transmitted wave. During the above dynamic experiments with the representative of silty sand soils, it was observed that its dynamic compaction at a high strain rate is different than in the case of the Proctor test. This is due to higher compaction energy, which additionally changes the grain size by destroying the grains in the structure. The paper presents the results of particle size distribution analysis for two different types of soil samples - this type of analysis is unique. Hence experiments should be further continued for such soils with different granulations and various moisture using, for example, Hopkinson measuring bar technique to confirm for other silty sand soils that are often subgrade of various engineering objects.
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Authors and Affiliations

Ryszard Chmielewski
1
ORCID: ORCID
Leopold Kruszka
1
ORCID: ORCID
Ryszard Rekucki
1
Kamil Sobczyk
1
  1. Military University of Technology, Dept. of Military Engineering and Military Infrastructure, 2 Gen. Sylwester Kaliski Str., 00-908 Warsaw, Poland

New method for comparing of particle-size distribution curves

Leszek Opyrchał Ryszard Chmielewski Aleksandra Bąk
Archives of Civil Engineering | 2022 | vol. 68 | No 1 | 63-72 | DOI: 10.24425/ace.2022.140156
Keywords particle-size distribution curve dam chi-modulus test uncertainty of sieves curve
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Abstract

The article discusses a new mathematical method for comparing the consistency of two particle size distribution curves. The proposed method was based on the concept of the distance between two graining curves. In order to investigate whether the distances between the particle size distribution curves are statistically significant, it was proposed to use the statistical test modulus-chi. As an example, the compliance of three sieve curves taken from the earth dam in Pieczyska on the Brda River in Poland was examined. In this way, it was established from which point of the dam the soil was washed away. However, it should be remembered that the size of the soil grains built into the dam does not have to be identical to the grain size of the washed out soil, because the fine fractions will be washed away first, while the larger ones may remain in the body of the earth structure.
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Bibliography

[1] J. Guevara, “Review of particle size distribution analysis methods”, 2018. University of Florida Soil and Water Sciences Department. [Online], Available: https://soils.ifas.ufl.edu/media/soilsifasufledu/sws-mainsite/pdf/technical-papers/Guevara_Jorge_One_Year_Embargo.pdf [Accessed: 28.04.2021].
[2] S. Blott, K. Pye, “GRADISTAT: A grain size distribution and statistics package for the analysis of unconsolidated sediments”, Earth Surface Processes and Landforms, 2001, vol. 26, pp. 1237–1248, DOI: 10.1002/esp.261.
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[4] H. Alkhaldi, C. Ergenzinger, F. Fleißner, P. Eberhard, “Comparison between two different mesh descriptions used for simulation of sieving processes”, Granular Matter, 2008, vol. 10, pp. 223–229, DOI: 10.1007/s10035-008-0084-4.
[5] J. Fernlund, R. Zimmerman, D. Kragic, “Influence of volume/mass on grain-size curves and conversion of image-analysis size to sieve size”, Engineering Geology, 2007, vol. 90, pp. 124–137, DOI: 10.1016/j.enggeo.2006.12.007.
[6] W. Weipeng, L. Jianli, Z. Bingzi, Z. Jiabao, L. Xiaopeng, Y. Yifan, “Critical Evaluation of Particle Size Distribution Models Using Soil Data Obtained with a Laser Diffraction Method”, PLoS ONE, 2015, vol. 10(4): e0125048, DOI: 10.1371/journal.pone.0125048.
[7] G.L. Santana, C.T. Brasileiro, G.A. Azeredo, H.C. Ferreira, G.A. Neves, H.S. Ferreira, “A comparative study of particle size distribution using analysis of variance for sedimentation and laser diffraction methods”, Cerâmica, 2019, vol. 65(375), pp. 452–460, DOI: 10.1590/0366-69132019653752623.
[8] S. Brandt, Data Analysis. Statistical and Computational Methods for Scientists and Engineers. Cham: Springer, 2014, ISBN 978-3-319-03761-5, DOI: 10.1007/978-3-319-03762-2.
[9] L. Opyrchał, “Applying the chi-modulus distribution to test the consistency of measurements”, Metrology and Measurement Systems, 1999, vol. 6, no. 3, pp. 135–142.
[10] A. Bak, R. Chmielewski, “The influence of fine fractions content in non-cohesive soils on their compactibility and the CBR value”, Journal of Civil Engineering and Management, 2019, vol. 25, no. 4, DOI: 10.3846/jcem.2019.9687.
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Authors and Affiliations

Leszek Opyrchał
1
ORCID: ORCID
Ryszard Chmielewski
1
ORCID: ORCID
Aleksandra Bąk
1
ORCID: ORCID
  1. Military University of Technology, Faculty of Civil Engineering and Geodesy, ul. gen. Sylwestra Kaliskiego 2, 00–908 Warsaw, Poland

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