Effect of stone column on soft soil

Phua, Kenneth (2013) Effect of stone column on soft soil. MSc dissertation, University of Portsmouth.

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    Abstract

    This report demonstrates the results of numerical simulation studying the effect of stone columns on soft soil under an embankment at working load. Different approaches are studied using the finite element analysis program Plaxis 2D. The main challenge in this report is the simulation of the stone columns including the estimation of the smear zone around the stone columns as well as the consideration of the construction effects due to the installation of stone columns.
    The finite element analysis is carried out at the test embankment at Penchala Toll Plaza project. The embankment was constructed on soft soil and reinforced with stone columns. The finite element simulation of the embankment with stone column is performed to compare the settlement and rate of consolidation between the finite element analysis results and the field measurement results. Besides that, a comparison on the settlement and rate of consolidation between the hand calculation results and finite element results is also performed.
    There is a relatively good correlation shown in comparison of the analysis. It was found that the increase in the stone column size and stiffness of the stone column material play an important role in reducing the settlement. Where the increase in the spacing of the stone columns results in the reduction in the number of stone columns the settlement is increased. The permeability ratio of the smear zone, k_h/k_s affects the consolidation where the increase in the permeability ratio of smear zone reduces the rate of consolidation.
    The finite element analysis has verified that excess pore water pressure dissipates faster in soil due to stone column work, thus accelerating the consolidation process.

    Item Type: Dissertation
    Departments/Research Groups: Faculty of Technology > School of Civil Engineering and Surveying
    Depositing User: Beth Atkins
    Date Deposited: 01 Aug 2014 09:18
    Last Modified: 28 Jan 2015 12:39
    URI: http://eprints.port.ac.uk/id/eprint/15163

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