Practice problems Sol_Exam2_2022

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Georgia Institute Of Technology *

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4405

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Dec 6, 2023

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Georgia Institute of Technology School of Civil and Environmental Engineering CEE 4405B Practice Problems Exam 2 Geotechnical Engineering Page 1 of 7 Practice Problems Exam 2 Problem 1: A borrow soil is being considered for fill material on a road construction site. The volume of soil to be compacted in place is 270,000 ft 3 . The borrow soil has the following properties: Borrow soil unit total weight in place= 100 lb/ft 3 Borrow soil in place water content= 20% Borrow soil maximum dry unit weight from the standard Proctor test= 111 lb/ft 3 Borrow soil total unit weight in transport= 88 lb/ft 3 If the soil must be compacted to 92% of standard Proctor, with a water content= 12%, determine: a) Volume of borrow soil to be excavated b) Number of dump truck loads that will be required to transport the soil to the site. Assume each dump truck load = 270 ft 3 Sol.:

Georgia Institute of Technology School of Civil and Environmental Engineering CEE 4405B Practice Problems Exam 2 Geotechnical Engineering Page 2 of 7 Problem 2: For the soil profile shown below, determine: a) The effective stress at point A. Sol. prob. part a

Georgia Institute of Technology School of Civil and Environmental Engineering CEE 4405B Practice Problems Exam 2 Geotechnical Engineering Page 3 of 7 b) How high can the water in the piezometer rise before quick conditions occur at the interface between the silt and clay layers below the excavation? Sol. prob. part b

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Georgia Institute of Technology School of Civil and Environmental Engineering CEE 4405B Practice Problems Exam 2 Geotechnical Engineering Page 4 of 7 Problem 3: A fill is being placed over a soft compressible clay layer with the following profile:

Georgia Institute of Technology School of Civil and Environmental Engineering CEE 4405B Practice Problems Exam 2 Geotechnical Engineering Page 5 of 7 A consolidation curve measured for the clay in the laboratory is shown on the following page . How much settlement will occur if 28 feet of fill is placed on top of the sand layer? Problem 4: A canal is dug parallel to a river as shown in the figure below. Unfortunately, a permeable sand layer connects the canal to the river, allowing water to flow between the two. You measure the hydraulic conductivities of the soils in the lab, and determine: k sand = 1.5 x 10 -5 cm/sec. If the hydraulic conductivity of the clay is so low that it can be considered impermeable, determine the flowrate from the canal to the river.

Georgia Institute of Technology School of Civil and Environmental Engineering CEE 4405B Practice Problems Exam 2 Geotechnical Engineering Page 6 of 7 Sol. Problem 5 a) Please define the concept of effective stresses b) What soil parameter is most strongly correlated with the hydraulic conductivity of coarse grained soils? c) Why does groundwater seepage alter the effective stress of a soil deposit? d) Please explain the difference between compaction and consolidation. e) Describe the components of the total head equation and their role in controlling the flow of water through soils. f) Define the maximum dry unit and optimum water content concepts in compaction, why do we compact soils? g) What is the difference between the standard and modified proctor tests, plot two compaction curves (schematically) associated with these tests? h) Why do we draw the zero air voids when building compaction curves?

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Georgia Institute of Technology School of Civil and Environmental Engineering CEE 4405B Practice Problems Exam 2 Geotechnical Engineering Page 7 of 7 i) Describe what is the overconsolidation ratio. j) How the preconsolidation pressure and coefficient of consolidation are estimated, what do they represent?

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