2. A layer of compressible clay 6m thick overlies an impervious bedrock and carries an overburden of pervious sand. A large structure founded in the sand causes the stress on every horizontal section of the clay to increase to the same value. In a standard laboratory oedometer consolidation test performed on a 19 mm thick clay specimen, the void ratio changed from 0.765 to 0.750 under a corresponding increase in stress. Consolidation was 70% complete after 30 min. In the field, a) Estimate the settlement of the structure. b) Determine the time taken for one half of the consolidation settlement to take place (Remember the lab test is for a doubly drained specimen.). c) Determine how long it takes for 50% of the settlement to take place at a depth of 0, 2, 3, 5 and 6 m of the clay stratum. d) If the clay were underlain by pervious sand, determine how long it takes for 50% of the settlement to take place at a depth of 0, 2, 3, 5 and 6 m of the clay stratum.
2. A layer of compressible clay 6m thick overlies an impervious bedrock and carries an overburden of pervious sand. A large structure founded in the sand causes the stress on every horizontal section of the clay to increase to the same value. In a standard laboratory oedometer consolidation test performed on a 19 mm thick clay specimen, the void ratio changed from 0.765 to 0.750 under a corresponding increase in stress. Consolidation was 70% complete after 30 min. In the field, a) Estimate the settlement of the structure. b) Determine the time taken for one half of the consolidation settlement to take place (Remember the lab test is for a doubly drained specimen.). c) Determine how long it takes for 50% of the settlement to take place at a depth of 0, 2, 3, 5 and 6 m of the clay stratum. d) If the clay were underlain by pervious sand, determine how long it takes for 50% of the settlement to take place at a depth of 0, 2, 3, 5 and 6 m of the clay stratum.
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Transcribed Image Text:2. A layer of compressible clay 6m thick overlies an impervious bedrock and carries an
overburden of pervious sand. A large structure founded in the sand causes the stress on every
horizontal section of the clay to increase to the same value.
In a standard laboratory oedometer consolidation test performed on a 19 mm thick clay
specimen, the void ratio changed from 0.765 to 0.750 under a corresponding increase in
stress. Consolidation was 70% complete after 30 min.
In the field,
a) Estimate the settlement of the structure.
b) Determine the time taken for one half of the consolidation settlement to take place
(Remember the lab test is for a doubly drained specimen.).
c) Determine how long it takes for 50% of the settlement to take place at a depth of 0, 2, 3,
5 and 6 m of the clay stratum.
d) If the clay were underlain by pervious sand, determine how long it takes for 50% of the
settlement to take place at a depth of 0, 2, 3, 5 and 6 m of the clay stratum.
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