QI- An embankment is to be constructed over a layer of soft clay 16 m thick as shown in figure 1. Construction the embankment will increase the total vertical stress in the clay layer by 110 kPa. The design requirement is that all but 25 mm of the settlement due to consolidation of the clay layer will have taken place after 6 months. Determine: A. The spacing in best pattern of 500 mm diameter sand drains to achieve the above requirement. B. Which is the best, the use of sand drains or pre-fabricated drains? Why? (25%) Embankment Clay Cy = 4.7 m?/ year Ch 7.9 m2/ year my= 0.25 m2/ MN 16 m Sand Figure (1).

Structural Analysis
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Author:KASSIMALI, Aslam.
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Chapter2: Loads On Structures
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Ql- An embankment is to be constructed over a layer of soft clay 16 m thick as
shown in figure 1. Construction the embankment will increase the total
vertical stress in the clay layer by 110 kPa. The design requirement is that all
but 25 mm of the settlement due to consolidation of the clay layer will have
taken place after 6 months. Determine:
A. The spacing in best pattern of 500 mm diameter sand drains to achieve the
above requirement.
B. Which is the best, the use of sand drains or pre-fabricated drains? Why?
(25%)
Embankment
Clay
Cy = 4.7 m2/ year
Ch = 7.9 m2/ year
mv= 0.25 m2/ MN
16 m
Sand
Figure (1).
Transcribed Image Text:Ql- An embankment is to be constructed over a layer of soft clay 16 m thick as shown in figure 1. Construction the embankment will increase the total vertical stress in the clay layer by 110 kPa. The design requirement is that all but 25 mm of the settlement due to consolidation of the clay layer will have taken place after 6 months. Determine: A. The spacing in best pattern of 500 mm diameter sand drains to achieve the above requirement. B. Which is the best, the use of sand drains or pre-fabricated drains? Why? (25%) Embankment Clay Cy = 4.7 m2/ year Ch = 7.9 m2/ year mv= 0.25 m2/ MN 16 m Sand Figure (1).
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