1. A concrete raft with a dimension of 9 m x 9 m x 0.5 m thick is rested on a deep mixed column-supported foundation with an embedment depth of 0.5 m, as shown below. 4 x 4 rows of columns with a diameter of 0.75 m and a length of 9 m are installed in uniform soft clay with a spacing of 2.5 m in a square pattern. The soft clay is more than 20 m thick and has a saturated unit weight of 15.6 kN/m² and a drained modulus of 4.5 MPa and the groundwater is at the surface. The columns have an unconfined compressive strength of 1.1 MPa and a saturated unit weight of 20 kŅ/m³. The Poisson's ratio of the soft clay and the columns are 0.4 and 0.2, respectively. Estimate the settlement of the raft under a vertical load of 16 MN. 9 m 0.75 m|

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1. A concrete raft with a dimension of 9 m x 9 m x 0.5 m thick is rested on a deep mixed column-supported
foundation with an embedment depth of 0.5 m, as shown below. 4 x 4 rows of columns with a diameter of
0.75 m and a length of 9 m are installed in uniform soft clay with a spacing of 2.5 m in a square pattern.
The soft clay is more than 20 m thick and has a saturated unit weight of 15.6 kN/m³ and a drained modulus
of 4.5 MPa and the groundwater is at the surface. The columns have an unconfined compressive strength
of 1.1 MPa and a saturated unit weight of 20 KN/m?. The Poisson's ratio of the soft clay and the columns
are 0.4 and 0.2, respectively. Estimate the settlement of the raft under a vertical load of 16 MN.
9 m
•0.75 m
9 m
7.5 m
9 m
Transcribed Image Text:1. A concrete raft with a dimension of 9 m x 9 m x 0.5 m thick is rested on a deep mixed column-supported foundation with an embedment depth of 0.5 m, as shown below. 4 x 4 rows of columns with a diameter of 0.75 m and a length of 9 m are installed in uniform soft clay with a spacing of 2.5 m in a square pattern. The soft clay is more than 20 m thick and has a saturated unit weight of 15.6 kN/m³ and a drained modulus of 4.5 MPa and the groundwater is at the surface. The columns have an unconfined compressive strength of 1.1 MPa and a saturated unit weight of 20 KN/m?. The Poisson's ratio of the soft clay and the columns are 0.4 and 0.2, respectively. Estimate the settlement of the raft under a vertical load of 16 MN. 9 m •0.75 m 9 m 7.5 m 9 m
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