Experimental studies on single reinforced stone columns with various positions of geotextile
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TECHNICAL PAPER
Experimental studies on single reinforced stone columns with various positions of geotextile Saeid Bazzazian Bonab1 · Seyed Hamid Lajevardi1 · Hamid Reza Saba2 · Abbas Ghalandarzadeh3 · Seyed Mohammad Mirhosseini1 Received: 31 March 2020 / Accepted: 4 August 2020 © Springer Nature Switzerland AG 2020
Abstract Stone columns are used as a technique for improving the strength and enhancing the bearing capacity of soft soils. Due to the low confinement of the soil typically surrounding the stone columns, reinforcement materials like geotextile are needed to improve such weakness. Although the technique is now well established, little research has been undertaken on the use of various positions of the reinforcement materials. In this paper, some small-scale laboratory tests were performed on reinforced floating stone columns with diameters of 80 mm and 100 mm and the length of 400 mm and 500 mm, respectively, to study the influence of various positions of geotextile. They were included vertical encasement stone columns, horizontal reinforcement stone columns and combined vertical–horizontal encasement stone columns. The impacts of the different diameters of the columns, the length of the reinforcement and the spaces of the reinforcement have been studied. Based on the results, by increasing the diameter of the vertical encasement stone column, the benefit of encasement decreases, while in horizontal and vertical–horizontal encasement stone column, the performance of the reinforcement increases. Moreover, the load-carrying capacity of combined vertical–horizontal encasement stone columns increases considerably in comparison with the other types. Keywords Stone column · Laboratory study · Kaolin clay bed · Geotextiles · Ground improvement
Introduction
* Seyed Hamid Lajevardi sh‑lajevardi@iau‑arak.ac.ir Saeid Bazzazian Bonab sbazazian92@iau‑arak.ac.ir Hamid Reza Saba [email protected] Abbas Ghalandarzadeh [email protected] Seyed Mohammad Mirhosseini m‑mirhoseini@iau‑arak.ac.ir 1
Department of Civil Engineering, Arak Branch, Islamic Azad University, Arak, Iran
2
Department of Civil Engineering, Tafresh University, Tafresh, Iran
3
School of Civil Engineering, University College of Engineering, University of Tehran, Tehran, Iran
With the ever-increasing population of the world, the need for construction in urban areas with poor soils has become a major problem. Among a variety of techniques for ground improvement, stone columns are usually used where an increase in load-carrying capacity or reduction in the settlement is required. Increasing the shear resistance of soil and reducing the time of consolidation settlement, are also other benefits of this technique. Most experimental studies summarized the mechanisms of failure for a single stone column subjected to axial compressive load: punching failure, shear failure and bulging failure [1–5]. The effectuality of ordinary stone columns (OSCs) will be reduced in very soft soil [6]. In OSCs, the columns usually fail in bulging because of th
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