9.18 Fig. P9.18 shows the soil profile at a site for a proposed office building. It is expected that the vertical stress at the top of the clay will increase by 150 kPa and at the bottom by 90 kPa. Assuming a linear stress distribution within the clay, calculate the consolidation settlement. [ Hint: You should divide the clay into five equal layers, compute the settlement for each layer, and then find the total settlement.] Groundwater level is at the top of the clay layer. An oedometer test on a sample of the clay revealed that the time for 90% consolidation on a 20 mm thick sample occurred in 40 minutes. The sample was drained on the upper and lower boundaries. How long will it take for 50% consolidation to occur in the field? 5 m w = 23% Sand S= 90% w = 40% 10 m C 0.3 OCR = 1 Clay Impervious rock FIGURE P9.18
9.18 Fig. P9.18 shows the soil profile at a site for a proposed office building. It is expected that the vertical stress at the top of the clay will increase by 150 kPa and at the bottom by 90 kPa. Assuming a linear stress distribution within the clay, calculate the consolidation settlement. [ Hint: You should divide the clay into five equal layers, compute the settlement for each layer, and then find the total settlement.] Groundwater level is at the top of the clay layer. An oedometer test on a sample of the clay revealed that the time for 90% consolidation on a 20 mm thick sample occurred in 40 minutes. The sample was drained on the upper and lower boundaries. How long will it take for 50% consolidation to occur in the field? 5 m w = 23% Sand S= 90% w = 40% 10 m C 0.3 OCR = 1 Clay Impervious rock FIGURE P9.18
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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![9.18 Fig. P9.18 shows the soil profile at a site for a proposed office building. It
is expected that the vertical stress at the top of the clay will increase by 150
kPa and at the bottom by 90 kPa. Assuming a linear stress distribution
within the clay, calculate the consolidation settlement. [ Hint: You should
divide the clay into five equal layers, compute the settlement for each layer,
and then find the total settlement.] Groundwater level is at the top of the
clay layer. An oedometer test on a sample of the clay revealed that the time
for 90% consolidation on a 20 mm thick sample occurred in 40 minutes.
The sample was drained on the upper and lower boundaries. How long will
it take for 50% consolidation to occur in the field?
w = 23%
5 m
S = 90%
Sand
w = 40%
10 m C=0.3
OCR = 1
Clay
Impervious rock
FIGURE P9.18](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F0dfb54b4-0db6-4022-b1f2-55560954df82%2Ff5d7d485-ad14-4ca2-8c62-8431d094ad3f%2Fzq938yr_processed.jpeg&w=3840&q=75)
Transcribed Image Text:9.18 Fig. P9.18 shows the soil profile at a site for a proposed office building. It
is expected that the vertical stress at the top of the clay will increase by 150
kPa and at the bottom by 90 kPa. Assuming a linear stress distribution
within the clay, calculate the consolidation settlement. [ Hint: You should
divide the clay into five equal layers, compute the settlement for each layer,
and then find the total settlement.] Groundwater level is at the top of the
clay layer. An oedometer test on a sample of the clay revealed that the time
for 90% consolidation on a 20 mm thick sample occurred in 40 minutes.
The sample was drained on the upper and lower boundaries. How long will
it take for 50% consolidation to occur in the field?
w = 23%
5 m
S = 90%
Sand
w = 40%
10 m C=0.3
OCR = 1
Clay
Impervious rock
FIGURE P9.18
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