Numerical modelling of drop load tests

Colombero, R.; Kontoe, Stavroula; Foti, Sebastiano; Potts, David M.

doi:10.1016/j.soildyn.2015.05.012

Cited by 7 publications

(2 citation statements)

References 22 publications

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“…The model dimensions were kept as 650 m×650 m. They were selected in such a way that the criterion proposed by Aung and Leong (2011) is followed to avoid wave reflections from the boundaries. Also, absorbent boundaries were kept at the right-hand and bottom side of the model to absorb wave reflections, based on Lysmer and Kuhlemeyer (1969);and Colombero et al (2015). At the left-hand boundary, the horizontal displacement was restricted to simulate axis symmetry.…”

Section: Generation Of Dispersion Curves For the Idealized Vs Profilesmentioning

confidence: 99%

Use of a-priori information to minimize uncertainties in surface wave inversion and subsequent site response analysis

Desai

Jakka

Foti

2022

Preprint

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Multi-channel analysis of surface waves (MASW) is the most popular method to estimate the shear wave velocity (Vs) profile of soil and subsequently, the seismic site response. Nevertheless, the inversion process to retrieve the Vs profile from MASW testing is inherently ill-posed and non-unique, inducing considerable uncertainties in the results. Also, using nonlinearity curves without knowing the soil type leads to further uncertainties in site response analysis (SRA) results. Despite several efforts by researchers, the uncertainties in MASW testing and subsequent SRA still remain a matter of obvious concern in earthquake engineering. In this study, an attempt has been made to investigate how these uncertainties can be tackled by utilizing a-priori information from geotechnical investigations. The type of a-priori information used in this work is the number and thickness of soil layers, soil type, and index properties. Initially, a numerical study was carried out using simulations of MASW and SRA for nine possible types of idealized Vs profiles using three different types of earthquake motions. Then, a field MASW test, borehole drilling, sampling and SRA were carried out at a site in Roorkee, India. Statistical properties of the results without and with a-priori information were determined and compared. It was found that for any type of Vs profile or seismic motion, the use of a-priori information significantly mitigates the inversion uncertainty in MASW and SRA, thereby remarkably enhancing the reliability and accuracy of the MASW and SRA results. This work also provides a quantitative assessment of the uncertainty reduction using a-priori information for different possible site and earthquake scenarios, which would help understand the need for a-priori information with MASW testing.

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Section: Generation Of Dispersion Curves For the Idealized Vs Profilesmentioning

confidence: 99%

Use of a-priori information to minimize uncertainties in surface wave inversion and subsequent site response analysis

Desai

Jakka

Foti

2022

Preprint

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“…These are based on the evaluation of the velocities of P-and S-waves penetrating the soil (Safaee et al, 2022; Lindh, Lemenkova, 2022d, Foti, Lancellotta, 2004). Other examples include the Rayleigh-Ritz method which evaluates the free vibration characteristics in the ground (Sonkar, Mittal, 2022;Jones, 1958) or attenuation of waves through the evaluation of vibration over time (Colombero et al, 2015). Several experimental papers have been published on the application of wave velocity to evaluate soil parameters.…”

Section: Introductionmentioning

confidence: 99%

Ultrasonic P- and S-Wave Reflection and CPT Soundings for Measuring Shear Strength in Soil Stabilized by Deep Lime/Cement Columns in Stockholm Norvik Port

2023

Archives of Acoustics

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In this research project, the measurements of the ultrasonic P-and S-waves and seismic cone penetration testing (CPT) were applied to identify subsurface conditions and properties of clayey soil stabilized with lime/cement columns in the Stockholm Norvik Port, Sweden. Applied geophysical methods enabled to identify a connection between the resistance of soil and strength in the stabilized columns. The records of the seismic tests were obtained in the laboratory of Swedish Geotechnical Institute (SGI) through estimated P-and S-wave velocities using techniques of resonance frequency measurement of the stabilized specimens. The CPT profiles were used to evaluate the quality of the lime/cement columns of the reinforced soil by the interpretation of signals. The relationship between the P-and S-waves demonstrated a gain in strength during soil hardening. The quality of soil was evaluated by seismic measurements with aim to achieve sufficient strength of foundations prior to the construction of the infrastructure objects and industrial works. Seismic CPT is an effective method essential to evaluate the correct placement of the CPT inside the column. This work demonstrated the alternative seismic methods supporting the up-hole technology of drilling techniques for practical purpose in civil engineering and geotechnical works.

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Role of Borehole Information in Minimizing Uncertainties in Surface Wave Testing

Desai

Kranthikumar

Jakka

2022

Lecture Notes in Civil Engineering

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Numerical modelling of drop load tests

Cited by 7 publications

References 22 publications

Use of a-priori information to minimize uncertainties in surface wave inversion and subsequent site response analysis

Use of a-priori information to minimize uncertainties in surface wave inversion and subsequent site response analysis

Ultrasonic P- and S-Wave Reflection and CPT Soundings for Measuring Shear Strength in Soil Stabilized by Deep Lime/Cement Columns in Stockholm Norvik Port

Role of Borehole Information in Minimizing Uncertainties in Surface Wave Testing

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