Assessing the Stability of Embankment Slopes - Case Study - Engineering Assignment Help

Assignment Task

A slope can be a natural slope or one created by excavation or an embankment created by engineering fill. Slope stability is the potential of a naturally occurring or engineered soil slope such as embankment slopes, cuttings, excavations to withstand ground movement. Geotechnical engineers have to pay particular attention to geology, surface drainage, groundwater, and the shear strength of soils in assessing slope stability however, a previously stable slope may become unstable, leading to mass movement due to increase in shear stress or decrease in shear strength.

(a) Review ten (10) case histories of recent slope failures and summarise your findings using a table, stating each case and the cause of failure.

(b) An embankment slope consisting of a granular fill is underlain by a deep deposit of clay of specific gravity of 2.65. The granular fill has a bulk unit weight of 19.3 kN/m3, effective cohesion, c'= 7.2 kPa and internal friction angle, '=30°. If the clay soil has varying moisture content and undrained shear strength at different times of the year as presented in Table 1, investigate the stability of the embankment slope using the slip circle shown in Figure 1. How does the varying soil properties influence the stability of the slope? Draw the slope to scale on a graph paper or using CAD and split the sliding section up into a suitable number of slices.

(c) Assume that the ground water level rises to the top of the clay layer in Figure 1, and the clay layer has c' = 75kPa, ø'=7°, y = 20kN/m3, calculate the factor of safety, and compare your result with the safety factors calculated in Part 2 (b) above.

This table to be used and the slope to be divided into 5 slices only using the bishop method. The slice area layer, width to be calculated by hand and not software. The report to be 1000 words

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