Effect of Silt Content on Liquefaction Susceptibility of Fine Saturated River Bed Sands
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RESEARCH PAPER
Effect of Silt Content on Liquefaction Susceptibility of Fine Saturated River Bed Sands Pradipta Chakrabortty1
•
Nishant Nilay1 • Angshuman Das1
Received: 21 April 2020 / Revised: 15 September 2020 / Accepted: 24 September 2020 Iran University of Science and Technology 2020
Abstract The effect of silt intrusion on the liquefaction susceptibility of fine saturated sand has been studied here using a series of strain-controlled cyclic triaxial tests on isotropically consolidated soil specimens. The fine sands used in this study were collected from the Ganga and Sone river bed. The samples were prepared with 100% non-plastic silt, 100% sand and different percentage (5%, 10%, 20%, and 30%) of non-plastic silt mixed with fine sand to study the effect of intruded silt on liquefaction susceptibility of sand. It has been found that at the same relative density range (10–25%) and the same percentage of intruded non-plastic silt, the Ganga sand is having higher liquefaction susceptibility than the Sone sand. The outcome of the study also showed that the rate of generation of excess pore water pressure (EPWP) for all three soil specimens was more or less same at higher strain levels (0.66–1.31%). However, the liquefaction potential continues to increase with the increase in silt content at a lower strain rate of 0.13%. A graphical relationship has been proposed for the EPWP development model parameter as a function of non-plastic silt content. This modification in the EPWP model parameter is one of the novel aspects presented here, which can be used for site-specific nonlinear ground response analysis. Keywords Liquefaction Fine sand Non-plastic silt Strain-controlled test Cyclic triaxial Abbreviations Cc Coefficient of curvature Cu Coefficient of uniformity D10 Effective size of particles corresponding to 10% finer in the particle size distribution curve D30 Diameter of particles corresponding to 30% finer in the particle size distribution curve D50 Mean grain diameter D60 Diameter of particles corresponding to 60% finer in the particle size distribution curve p, F and EPWP Model parameter s e Cyclic axial strain cc Cyclic shear strain & Pradipta Chakrabortty [email protected] Nishant Nilay [email protected] Angshuman Das [email protected] 1
Department of Civil and Environmental Engineering, IIT Patna, Patna 801106, India
r0h r0m r0v
Effective stress acting on the horizontal direction Mean principal effective stress Effective stress acting on soil on the vertical direction
1 Introduction Liquefaction is an undesirable phenomenon that occurs due to substantial or total loss of shear strength and stiffness of soil during a cyclic or monotonic loading. The loss of shear strength and stiffness of soil may cause because of reduction in effective stress of soil deposit under cyclic loading condition. The liquefaction is dependent on various parameters that vary from one place to another like relative density, soil type, water table d
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