CE En 544 - Exam #2 KEY

Winter Semester 2018

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1. (1.5 pt each) True or False:

a. T F  (slope-reinforcement) When simulating reinforcement in a slope stability analysis, the reinforcement forces input to the analysis are allowable forces and are not divided by the factor of safety prior to the computations.

b. T F  (slope-limit equil) With the Bishop's Simplified Procedure, we must solve for the factor of safety iteratively.

c. T F  (slope-limit equil) The Ordinary Method of Slices is a complete equilibrium procedure.

d. T F  (slope-limit equil) Spencer's Method is a complete equilibrium procedure.

e. T F  (slope-reliability) With respect to the 3-sigma rule used in reliability analysis, studies have shown that even experts tend to under-predict the range in parameter values (max-min). However, this is conservative because it leads to a smaller estimate of reliability.

f. T F  (slope-imp details) When doing an infinite slope analysis with a homogenous purely cohesive soil, the critical depth will alway be at the base of the layer (top of bedrock).

g. T F  (slope-seismic) When performing a seismic analysis, the acceleration multiplier used to compute the k term is used to increase the peak acceleration because the acceleration is typically based on the bedrock and the acceleration at the ground surface is typically

h. T F  (slope-causes) Lateral spreads generally occur on steep slopes.

i. T F  (slope-shear strength) Effective stress is equal to the total stress plus the pore water pressure.

j. T F  (slope-shear strength) When conducting the consolidation stage of a CD or CU triaxial shear test on a soil, the time required for consolidation to occur is inversely proportional to the hydraulic conductivity of the soil.