Analysis on the Performance of Stone Columns with Different Materials in Soil Stabilization
Samuel Thanaraj. M1, Freeda Christy.C2, Brema.J3
1Samuel Thanaraj M, Phd Scholar, Assistant Professor, Nehru Institute of Technology, (Tamil Nadu), India.
2Freeda Christy C, Associate Professor, Department of Civil Engineering, Karunya Institute of Technology and Sciences, (Tamil Nadu), India.
3Brema J, Programme Coordinator, Department of Civil Engineering, Karunya Institute of Technology and Sciences, (Tamil Nadu), India.
Manuscript received on 25 May 2019 | Revised Manuscript received on 03 June 2019 | Manuscript Published on 22 June 2019 | PP: 148-153 | Volume-8 Issue-3S, February 2019 | Retrieval Number: C10300283S19/19©BEIESP
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Abstract: Stone column ground improvement involves adding vertical columns of stone into the ground to a depth of at least 4m below the ground surface. A layer of compacted gravel can then be put over the top of the columns, ready for the construction of new house foundations. The stone column method is quick to construct and can be done at any time of the year. Stone columns are extensively used to improve the bearing capacity of poor ground and reduce the settlement of structures built on them. A stone column is one of the soil stabilization methods that is used to increase strength, decrease the compressibility of soft and loose fine graded soils, accelerate a consolidation effect and reduce the liquefaction potential of soils. The columns consist of compacted gravel or crushed stone arranged by a vibrator. This article presents installation methods, design and failure modes of stone columns. In this study, the filler material crushed stone is replace with other locally available materials such as Marble waste, Pebbles, Concrete waste. A study on the performance of the stone column with and without encasement also undertaken. Geogrid is used for encasement to control bulging effect. A set of tests were conducted on the Load versus settlement behavior of the stone columns at laboratory by installing the stone columns of size fixed based on the length to diameter ratio. Clay soil has been taken as sample and waste marbles, pebbles wee taken and different parameters. From the previous studies of literature it was understood that bulging effect on the stone column occurs during loading on the top portion of the stone columns. Another set of laboratory tests were conducted on the stone columns with geogrid encasement to control the bulging. From the results it was observed that encasement with geogrid controls the bulging effect and the locally available materials could be used as filler material of stone columns which can be used for improving the strength of loose soils.
Keywords: Stone Column, Bearing Capacity, Settlement, Stabilization, Soft Soil.
Scope of the Article: Soil-Structure Interaction