Applications and Investigations in Earth Science (9th Edition)
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ISBN: 9780134746241
Author: Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa
Publisher: PEARSON
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![8.
A large building is to be constructed. Since some sensitive instruments will be stored in the building,
post-construction settlement needs to be minimized. To achieve this, precompression will be
performed. The average effective vertical stress at the middle of the clay layer is 180 kN/m³. The large
building is estimated to cause a stress increase of 110 kN/m². The thickness of the clay layer is 8 m.
The initial void ratio is 0.85. The compression index and the swell index are equal to 0.30 and 0.06,
respectively. The coefficient of consolidation is 0.015 m²/day. The clay is normally consolidated and
has double drainage.
(i)
(ii)
Find the total settlement due to primary consolidation of the clay layer (due to the building load)
without precompression.
Suppose that the precompression is conducted by placing a temporary fill at the construction site.
After a target settlement (e.g. the amount of total settlement due to primary consolidation caused
by the construction large building) has been reached (in a specified period of time), all of the
temporary fill will be removed and the building will be constructed. [Note that this is slightly
different from the Das Example 12.22, in which part of the fill was used as the highway
embankment. Also, in reality, if there is excavation of soil due to the construction of the
foundation and basement, the settlement can also be reduced.]
Determine the required load from the temporary fill such that the settlement in (i) can be
completed in 1 year. Remember that the temporary fill would be completely removed before the
placement of the building.](https://content.bartleby.com/qna-images/question/7c1c398d-1b87-4237-bbf4-3e7b321e48da/b2e0f69d-b2de-4f92-851a-a5b08d8ab04b/2vvfpv_processed.jpeg)
Transcribed Image Text:8.
A large building is to be constructed. Since some sensitive instruments will be stored in the building,
post-construction settlement needs to be minimized. To achieve this, precompression will be
performed. The average effective vertical stress at the middle of the clay layer is 180 kN/m³. The large
building is estimated to cause a stress increase of 110 kN/m². The thickness of the clay layer is 8 m.
The initial void ratio is 0.85. The compression index and the swell index are equal to 0.30 and 0.06,
respectively. The coefficient of consolidation is 0.015 m²/day. The clay is normally consolidated and
has double drainage.
(i)
(ii)
Find the total settlement due to primary consolidation of the clay layer (due to the building load)
without precompression.
Suppose that the precompression is conducted by placing a temporary fill at the construction site.
After a target settlement (e.g. the amount of total settlement due to primary consolidation caused
by the construction large building) has been reached (in a specified period of time), all of the
temporary fill will be removed and the building will be constructed. [Note that this is slightly
different from the Das Example 12.22, in which part of the fill was used as the highway
embankment. Also, in reality, if there is excavation of soil due to the construction of the
foundation and basement, the settlement can also be reduced.]
Determine the required load from the temporary fill such that the settlement in (i) can be
completed in 1 year. Remember that the temporary fill would be completely removed before the
placement of the building.
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