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Behaviour Of Encased Stone Columns in Soft Clay
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Volume Title: ICASGE2023
DOI: ICASGE-GEO
Authors
1Mohamed Sakr; 1Waseim Ragab Azzam; 2Mona Khairy Mohamed 
; Mohamed Elgharib Elgharib Sakr; Waseim Ragab Azzam; Mona Khairy Mohamed
; Mohamed Elgharib Elgharib Sakr; Waseim Ragab Azzam; Mona Khairy Mohamed
1Professor of Geotechnical Engineering,Faculty of Engineering,Tanta University
2M.Sc student, faculty of engineering, Tanta university,Tanta, Egypt
Abstract
Over the last fifty years, various soft soil improvement and stabilization approaches have been developed. This research examines the improvement in the bearing capacity and reduction of settlement and how it is affected by many parameters.
A finite element model (FEM). PLAXIS 3D was used in this study for two diameters of columns (D=0.4m and 0.6m) and (L/D) ratio is kept equal (10). Two cases were studied: ordinary stone column (OSC) and encased stone column(ESC) column which is surrounded by a geotextile.
In this study, different undrained shear strength of the surrounding soil where it is taken as (cu =15 kN/m2, cu =20 kN/m2, and cu =25 kN/m2). For encased stone column diameter D=0.4 m, for soft soil with undrained shear strength (cu=15 kN/m2, cu=20 kN/m2, and cu=25 kN/m2) the improvement in the bearing ratio is 3.5, 4.6 times and 5.4 times respectively. While for diameter D=0.6 m the improvement in the bearing ratio is 3.10, 4.26 times, and 5 times respectively. For (OSC) both diameter D=0.40 m and D= 0.6m, the lateral deformation (Ux) at different values of undrained shear strength (cu =15 kN/m2, 20 kN/m2, and 25 kN/m2) for the soft clay soil, the bulging happens at zone up to (2D) in length from the top of the column. For Diameter D=0.4 m, for (ESC) the bulging zone appears below encasement, extending to (4D) in length. (ESC) with diameter D=0.6 m, the bulging zone extends to (3D) in length.
A finite element model (FEM). PLAXIS 3D was used in this study for two diameters of columns (D=0.4m and 0.6m) and (L/D) ratio is kept equal (10). Two cases were studied: ordinary stone column (OSC) and encased stone column(ESC) column which is surrounded by a geotextile.
In this study, different undrained shear strength of the surrounding soil where it is taken as (cu =15 kN/m2, cu =20 kN/m2, and cu =25 kN/m2). For encased stone column diameter D=0.4 m, for soft soil with undrained shear strength (cu=15 kN/m2, cu=20 kN/m2, and cu=25 kN/m2) the improvement in the bearing ratio is 3.5, 4.6 times and 5.4 times respectively. While for diameter D=0.6 m the improvement in the bearing ratio is 3.10, 4.26 times, and 5 times respectively. For (OSC) both diameter D=0.40 m and D= 0.6m, the lateral deformation (Ux) at different values of undrained shear strength (cu =15 kN/m2, 20 kN/m2, and 25 kN/m2) for the soft clay soil, the bulging happens at zone up to (2D) in length from the top of the column. For Diameter D=0.4 m, for (ESC) the bulging zone appears below encasement, extending to (4D) in length. (ESC) with diameter D=0.6 m, the bulging zone extends to (3D) in length.
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