Investigation of Shear Behavior of Stone Columns in Sandy Bed

مهندسی عمران فردوسی

Article 4, Volume 38, Issue 1 - Serial Number 49, April 2025, Pages 65-82   

Document Type: Original Article

DOI: 10.22067/jfcei.2024.90055.1323

Authors

Adel Shakibi Nezhad¹; sajjad gholipour^{* 2}; masoud makarchian³

¹Civil Engineering Department, Bu-Ali Sina University, Hamedan

²Department of Civil Engineering, Engineering Faculty of Khoy, Urmia University of Technology.

³Civil Engineering Department, Bu-Ali Sina University.

Abstract

There are various methods to improve loose soils. One of the improvement methods is the use of stone columns. This method decrease settlement, increase the resistance to liquefaction, improve load bearing capacity, vertical drainage and increase the speed of consolidation. In this paper, the effect of geotextile enclosures on the lateral bearing capacity of loose soil reinforced by stone columns are investigated. In order to study the behavior of stone columns, large-Scale Direct shear apparatus was used. The stone columns modeled in this apparatus have been tested in unreinforced and reinforced with geotextile materials under different normal stresses and in single and group mode with different diameters. The results show an increase in the value of the shear parameters of loose sand by reinforcing stone columns, so that the use of unreinforced stone column in the loose sand bed up to 17% of the sand surface increases the internal friction angle of the sand by 12% and 70% in the maximum shear strength, and the simultaneous use of the stone column and geotextile have led to a slight improvement of about 3% of the internal friction angle, and up to about 60% adhesion and 2.2 times the shear resistance depending on different parameters.

Keywords

Stone Column; Soil Improvement; Geotextile; large Scale Direct shear

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