Presentation Title

P and S Wave Velocities for Laboratory Prepared Soil Samples

Faculty Mentor

Binod Tiwari, Beena Ajmera

Start Date

18-11-2017 12:30 PM

End Date

18-11-2017 1:30 PM

Location

BSC-Ursa Minor 121

Session

Poster 2

Type of Presentation

Poster

Subject Area

engineering_computer_science

Abstract

The response of infrastructure founded on or within soil will depend on its dynamic properties. The purpose of this research is to determine the velocity of the compressional and shear waves using the bender element test. The results from the bender element tests were used to calculate the Young’s Modulus of Elasticity using the velocity of the compressional waves or p-waves and the shear modulus using the shear wave (s-wave) velocity. In this study, the samples consist of mixtures of montmorillonite, kaolinite, and quartz. Four samples, which were mixtures of 10% kaolinite with 90% quartz, 10% montmorillonite with 90% quartz, 20% montmorillonite with 80% quartz, and 30% montmorillonite with 70% quartz, were tested. The samples were consolidated under applied stresses of 25, 50, or 100 kPa. Upon testing these four soil samples under these consolidation pressures, it was found that a higher percentage of montmorillonite in the soil sample resulted in higher shear modulus and Young’s modulus values in the soil samples. Soils with kaolinite as the clay mineral had higher Young’s modulus and shear modulus values than the soils with montmorillonite as the clay mineral. It was also found that as the percentage of montmorillonite increased, the p-wave velocity increased, while the s-wave velocity decreased. An increase in the consolidation pressure resulted in an increase in both the Young’s modulus and the shear modulus.

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Nov 18th, 12:30 PM Nov 18th, 1:30 PM

P and S Wave Velocities for Laboratory Prepared Soil Samples

BSC-Ursa Minor 121

The response of infrastructure founded on or within soil will depend on its dynamic properties. The purpose of this research is to determine the velocity of the compressional and shear waves using the bender element test. The results from the bender element tests were used to calculate the Young’s Modulus of Elasticity using the velocity of the compressional waves or p-waves and the shear modulus using the shear wave (s-wave) velocity. In this study, the samples consist of mixtures of montmorillonite, kaolinite, and quartz. Four samples, which were mixtures of 10% kaolinite with 90% quartz, 10% montmorillonite with 90% quartz, 20% montmorillonite with 80% quartz, and 30% montmorillonite with 70% quartz, were tested. The samples were consolidated under applied stresses of 25, 50, or 100 kPa. Upon testing these four soil samples under these consolidation pressures, it was found that a higher percentage of montmorillonite in the soil sample resulted in higher shear modulus and Young’s modulus values in the soil samples. Soils with kaolinite as the clay mineral had higher Young’s modulus and shear modulus values than the soils with montmorillonite as the clay mineral. It was also found that as the percentage of montmorillonite increased, the p-wave velocity increased, while the s-wave velocity decreased. An increase in the consolidation pressure resulted in an increase in both the Young’s modulus and the shear modulus.