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Drilled shafts in sand: failure pattern and tip resistance using numerical and analytical approaches
, Article International Journal of Geotechnical Engineering ; Volume 16, Issue 8 , 2022 , Pages 974-990 ; 19386362 (ISSN) ; Ahmadi, M. M ; Sharif University of Technology
Taylor and Francis Ltd
2022
Abstract
Drilled shafts are one of the most important types of pile foundations. Several researchers have suggested different soil failure patterns for driven piles; however, for drilled shafts, this issue is inadequately addressed in the literature. In this paper, a numerical approach was pursued to obtain the location and dimensions of plastic zones around the tip of drilled shafts. The dependence of the suggested failure pattern size on the soil properties and drilled shaft dimensions was investigated. Based on several analyses, a soil jug-shaped failure pattern around the tip of drilled shafts was proposed, and its dimensions were determined using the regression-based and trial and error...
Three-dimensional numerical analysis of corner effect of an excavation supported by ground anchors
, Article International Journal of Geotechnical Engineering ; Volume 16, Issue 7 , 2022 , Pages 903-915 ; 19386362 (ISSN) ; Ahmadi, M. M ; Sharif University of Technology
Taylor and Francis Ltd
2022
Abstract
This paper presents a case study and numerical simulations of a corner of a deep excavation in Tehran supported by soldier piles and ground anchors. This study focuses on the differences between 2D and 3D numerical modelling in estimating the wall deflection at the corner locations of the excavation. Furthermore, the performance of modelling with Mohr–Coulomb constitutive law was compared with the result of a hardening soil model. The modelling procedure was calibrated against a full-scale instrumented tieback wall at Texas A&M University and the monitoring data of the excavation project. The results indicated that the hardening soil model yields reasonable predictions of wall deflection in...
Investigation of the Seismic Behavior of the Soil-Pile System with Three-Dimensional Nonlinear Modeling
, M.Sc. Thesis Sharif University of Technology ; Ahmadi, Mohammad Mehdi (Supervisor)
Abstract
A large number of structures and substructures, such as piles, have damaged or even yielded the entire structure during seismic loading. The kinematic interaction of piles under seismic loading has been widely studied from analytical, experimental, and numerical perspectives. In numerical modeling, most existing literature relies on simplified approaches to describe the soil-pile interaction, which leads to the need for more reliable and comprehensive research. In this research, the seismic response of the soil-pile system was investigated through a fully nonlinear three-dimensional numerical analysis in the time domain using the FLAC3D program. This model simulates the dependence of soil...