SCHOOL OF CIVIL ENGINEERING AND SURVEYING

SCHOOL OF CIVIL ENGINEERING AND SURVEYING 

Task: A cut slope in soft clay has been constructed as part of a road alignment. The slope is 1 in 2.466 (or 2.466:1 as a horizontal:vertical ratio) and 10 m high. The unit weight of the soft clay is 18 kN/m3 

. (a) At the time of construction the slope was designed based on undrained analysis parameters. An analysis using Taylors Charts yielded a factor of safety of 1.2 for the short term stability of the slope. Backcalculate the undrained shear strength (cu) of the soil assumed for the soft clay at the time. 

(b) A walk over survey recently indicated signs of instability. Samples have been collected from the slope and the drained analysis parameters for the soil have been determined as follows: 

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