Question

a. What is the slope angle and what is the slope ratio for the slope shown for Problem 12 Show all calculations. b. Assume the slope in Problem 1 is a cut slope with a calculated factor of safety for the critical slip surface of 1.3, which has been judged too low for the proposed development. What is the best method to improve stability, i.e., increase the calculated factor of safety, and why? Provide your answer in just one or two complete sentences. Assume that decreasing the slope height or reducing the slope angle are not options.

Answer 1

b.) Answer of part a given as factor of safety is equal to 1.3 which is considered to be too low for the proposed development.

In order to improve the stability or to increase the factor of safety apart from the methods like reducing slope hieght and slope angle is:-

To reinforce the soil of the slope with materials like either sheet pile or geotextiles etc. As these materials improve the soil properties in terms of shear strength , bearing capacity and stability by densifying the soil mass as soil particles come closer upon reinforcement due to which effective stress between soil grains increases and void ratio decreases as a result of which soil mass get densified and strength increases which prevents the slope failure.

Thus in this way stability of slope increases also factor of safety increases. FOS equals the ratio of shear strength by shear stress. here shear strength increases upon reinforcement so factor of safety and stability increases also.

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