Investigating the geotechnical performance of deep foundations in liquified soils Using the cone penetration test results

Maleki, Mohhamad; Eslami, Abolfazl; Nabizadeh, Ali; BahmanPour, Amin

doi:10.22065/jsce.2023.409474.3187

Investigating the geotechnical performance of deep foundations in liquified soils Using the cone penetration test results

Document Type : Original Article

Authors

Mohhamad Maleki ¹

Abolfazl Eslami ²

Ali Nabizadeh ³

Amin BahmanPour ⁴

¹ Department od civil engineering, Islamic Azad University, Science and Research Branch, Iran, Tehran

² Associate Professor, Department of Civil and Environmental Engineering, Amirkabir University of Technology, Tehran, Iran

³ Assistant Professor, Shahid Rajaee Teacher Training University, Department of Civil Engineering, Lavizan, Tehran, Iran

⁴ Assistant Professor, Department of Civil Engineering, Islamic Azad University, Science and Research Branch, Tehran, Iran

10.22065/jsce.2023.409474.3187

Abstract

Using the results of the cone penetration test (CPT) is one of the most important applications of this test to determine the bearing capacity of piles. Due to availability of a large amount of reliable data and the considerable speed of the CPT, the results of the CPT test can be used to both directly and indirectly determine either the tip or sleeve bearing capacity of of the piles. The application of earthquake acceleration to sensitive and liquefiable deposits will lead to an increase in excess pore water pressure (delta u) and subsequently to a decrease in strength and stiffness in such soils. Therefore, investigation of the pore water pressure development (delta u) as an index of dynamic load in seismic conditions is of great importance. The present research firstly aims to verify the applicability of CPT results to evaluate the liquefaction potential of sensitive soils using data provided by 60 practical cases from 11 different earthquakes in 7 countries. The influence of critical parameters such as soil sensitivity, undrained shear strength, and dimensionless parameter of pore water pressure on pore pressure development have been evaluated. In the next step, the effect of above-mentioned parameters on the bearing capacity of piles (including 18 different sites) has been investigated. Comparison between the results obtained from the proposed method and the conventional method shows a significant influence of the above parameters on the bearing capacity of the piles. Therefore, it is necessary to consider the impact of the parameters mentioned above while calculating the bearing capacity of piles in liquefiable soils.

Keywords

Pile

Liqufied Soils

Cone Penetration Test

Bearing Capacity

Pore water Pressure

Subjects

Geotechnical Engineering

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