Seismic Analysis of Floating Stone Columns in Soft Clayey Soil

Mahdi O Karkush,Karrar A Jawad,Amer G Jihad,Mustafa S Ali,Bilal J Noman,M Karkush,M Fattah,D Choudhury

doi:10.1051/e3sconf/202131801008

Mahdi O Karkush, Karrar A Jawad + Show 6 more

Open Access

https://doi.org/10.1051/e3sconf/202131801008

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Abstract

The response of floating stone columns of different lengths to diameter ratio (L/D = 0, 2, 4, 6, 8, and 10) ratios exposed to earthquake excitations is well modeled in this paper. Such stone column behavior is essential in the case of lateral displacement under an earthquake through the soft clay soil. ABAQUS software was used to simulate the behavior of stone columns in soft clayey soil using an axisymmetric finite element model. The behavior of stone column material has been modeled with a Drucker-Prager model. The soft soil material was modeled by the Mohr-Coulomb failure criterion assuming an elastic-perfectly plastic behavior. The floating stone columns were subjected to the El Centro earthquake, which had a magnitude of 7.1 and a peak ground acceleration of 3.50 m/s2. The surface displacement, velocity, and acceleration in soft clayey enhanced by floating stone columns are also smaller than in natural soft clay. The findings of this research revealed that under the influence of earthquake waves, lateral displacement varies with stone columns of various lengths.

Highlights

The majority of the soils in Iraq's middle and southern regions are soft to very soft cohesive soils, in areas near marshes
This paper aims to investigate the response of floating stone columns under the influence of seismic loading
The results showed that using stone columns can significantly minimize the lateral variation of the wave prorogation resulted from the earthquake

Summary

Introduction

The majority of the soils in Iraq's middle and southern regions are soft to very soft cohesive soils, in areas near marshes. In these areas, several projects are planned to be built. The stone columns method is one of the soil improvement methods that is used to improve soft soils by increasing soil strength, decreasing soil compressibility, speeding up the consolidation rate, and lowering the liquefaction potential ]2[. Because soft soils cannot be compacted, stone columns are commonly used. Because the stone columns are highly permeable, they act as vertical drains, allowing the soft clay around them to consolidate and improve the foundation's long-term performance

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