Dynamic Characterization of Cohesive Material Based on Wave Velocity Measurements

Sas, Wojciech; Gabryś, Katarzyna; Soból, Emil; Szymański, Alojzy

doi:10.3390/app6020049

Cited by 18 publications

(11 citation statements)

References 28 publications

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“…The specimen is fixed to the pedestal at the bottom end, and the other end is connected to the drive plate, while the top cap remains free. This system is provided with a testing unit (testing chamber), control computer, back pressure system, cell pressure controller, resonant column controller, and a data acquisition box [48][49][50].…”

Section: Methodsmentioning

confidence: 99%

Resilient Modulus Characterization of Compacted Cohesive Subgrade Soil

et al. 2017

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Soil investigations concerning cyclic loading focus on the evaluation, in particular, of design parameters, such as elastic modulus, Poisson's ratio, or resilient modulus. Structures subjected to repeated loading are vulnerable to high deformations, especially when subgrade soils are composed of cohesive, fully-saturated soils. Such subgrade soils in the eastern part of Europe have a glacial genesis and are a mix of sand, silt, and clay fractions. The characteristic of, e.g., Young modulus variation and resilient modulus from repeated loading tests, is presented. Based on performed resonant column and cyclic triaxial tests, an analytical model is proposed. The model takes into consideration actual values of effective stress p , as well as loading characteristics and the position of the effective stress path. This approach results in better characterization of pavement or industrial foundation systems based on the subgrade soil in undrained conditions. The recoverable strains characterized by the resilient modulus M r value in the first cycle of loading was between 44 MPa and 59 MPa for confining pressure σ' 3 equal to 45 kPa, and between 48 MPa and 78 MPa for σ' 3 equal to 90 kPa. During cyclic loading, cohesive soil, at first, degrades. When pore pressure reaches equilibrium, the resilient modulus value starts to increase. The above-described phenomena indicate that, after the plastic deformation caused by excessive load and excess pore water pressure dissipation, the soil becomes resilient.

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Section: Methodsmentioning

confidence: 99%

Resilient Modulus Characterization of Compacted Cohesive Subgrade Soil

et al. 2017

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“…The operating principles of a BEs system have been described in many previous studies of the authors, e.g., [54].…”

Section: Methodsmentioning

confidence: 99%

“…The frequency of the input signal was variable and decreased from the value f = 10 to f = 3.57 kHz (for lower pressure) or to f = 5.56 kHz (for higher pressure). This frequency range was used in order to reduce the near field effect [54]. According to Camacho-Tauta et al [60], the undesirable near field effect can be minimized by an appropriate selection of frequency (or period).…”

Section: Testing Proceduresmentioning

confidence: 99%

Application of Bender Elements Technique in Testing of Anthropogenic Soil—Recycled Concrete Aggregate and Its Mixture with Rubber Chips

et al. 2017

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Featured Application: Recycled Concrete Aggregate can be a very good alternative material for natural aggregate. Using soil-rubber mixture as an engineering material may not only provide alternative means of reusing waste but also significantly change dynamic properties of soil.Abstract: This paper discusses the application of piezoceramic bender elements (BEs) for measurement of shear wave velocity in the time and frequency domain in a triaxial cell under different isotropic confinement. Different interpretation methods were used in the tests and their results were finally compared with each other. Two types of anthropogenic material were tested: pure Recycled Concrete Aggregate (RCA) and RCA-rubber chips mixtures (15% of rubber addition). Presented study is an attempt to describe dynamic properties, in terms of shear wave velocity (V S ), of the aforementioned anthropogenic material using the technique commonly applied for natural soil. Although some research is currently being carried out, in order to evaluate physical, chemical and mechanical properties of RCA and rubber-soil mixtures, still little is known of their dynamic properties. Hence, this work will provide the experimental results of shear wave velocity of RCA and its modified version. The results show that tires chips significantly decrease the V S values of modified RCA. They help to reduce the near field effect, but the received parameters are more incoherent. The V S values were found to be influenced by interpretation technique, mean effective stress and wave's propagation period. The maximum V S values were obtained mostly from the frequency domain method, although time domain analysis gives the results that are more coherent.

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“…Niniejsza praca dotyczy określania "dynamicznego" współczynnika Poisson'a (ν dyn ) na podstawie badań w aparacie trójosiowym z piezoelementami typu bender i kolumny rezonansowej. Pomiary prędkości fal, zaliczane do badań "nieinwazyjnych" i "nieniszczących", wykonywane są w trakcie innych konwencjonalnych badań, co zmniejsza koszty oraz przyspiesza badania [2,3]. Na podstawie pomiarów rzeczywistych prędkości fal sejsmicznych można ocenić błąd popełniany przy szacowaniu wartości początkowego modułu odkształcenia (modułu Younga, E 0 ) przy założeniu współczynnika Poisson'a równego 0,5.…”

Section: Wprowadzenieunclassified