Abstract
The increasing demand for new infrastructure developments has recentlyled to an escalating trend to develop sites with inadequate groundconditions that were previously considered uneconomical to develop.These situations have posed challenged that geotechnical engineers aremeeting by cultivating innovative techniques like stone columns toovercome soft clay soil conditions. Among the various methods forimproving in situ ground conditions, stone columns are considered one ofthe most versatile and cost-effective ground improvement techniques. Stonecolumns reinforce cohesive soils and densify granular soils in order toincrease bearing capacity and decrease total and differential settlement.The accuracy of the results obtained depends on the knowledge of the inputdata for the tunnel and the surrounding soil. Many geotechnical challengesare expected to occur related to soft clay soil stability and tunnel lining.One of these problems is expected to occur related to tunnel lining stabilityand surrounding soil is the high values of settlement due to compressibilityof soft layer when it lies around or below tunnel lining.This present study aims to improve the behavior of tunnel lining andeliminate the effect of soft clay layer on this behavior by using verticalstone columns. This study is carried out by using Finite Element Method.The tunnel lining is meshed with two dimensional elements, called BEAM 6element. The soil and stone columns are meshed with another twodimensional elements called LST, (Linearly Varying Strain TriangularElement). In this study, the main parameters were taken into considerationare the position and properties of stone columns. It can be concluded thatusing of stone columns in tunnel opening zone has strong effect on theimproving behavior of tunnel lining. For application of this study, data ofCairo Metro Tunnel- Line 2, was chosen. The results of this study werecompared with the initial values obtained from case of does not includestone columns.
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