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In a failed soil slope of soft clay, the failure surface is circular and the centre of rotation is known.

The driving moment is computed to be 2800 kN-m and the resisting moment is computed to be 2450 kN-m. It is proposed to reconstruct the slope using several layers of geogrids having allowable tensile force of 20 kN/m. The average centroid of the reinforcement is anticipated to be 8 m away (vertically) from the centre of rotation. Compute the required number of layers of the reinforcement, if the desire factor of safety id 1.5.

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