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6m 4m ↓↓↓↓↓↓↓↓↓↓↓↓ 2m_ Sand Clay Rock Figure Q2 W.T. Soil properties: For the sand above the water table, it has a unit weight of 17 kN/m³, whilst the saturated sand has a saturated unit weight of 19 kN/m³. For the clay, the saturated unit weight is 16 kN/m³ and the coefficient of consolidation c, is 1.26m²/year. The clay is normally consolidated and has a compression index C,= 0.32 and a recompression C,= 0.018. The initial void ratio of the clay is 0.89 at mid-depth of the clay layer. The rock can be assumed to be impermeable. (a) Calculate the final settlement of the area due to consolidation of clay. (b) Calculate the settlement after a period of 3 years from the start of applying the surcharge. (c) If a very thin and highly permeable material existed below the clay layer, how would this thin layer affect the final and the 3 year settlement.

6m 4m ↓↓↓↓↓↓↓↓↓↓↓↓ 2m_ Sand Clay Rock Figure Q2 W.T. Soil properties: For the sand above the water table, it has a unit weight of 17 kN/m³, whilst the saturated sand has a saturated unit weight of 19 kN/m³. For the clay, the saturated unit weight is 16 kN/m³ and the coefficient of consolidation c, is 1.26m²/year. The clay is normally consolidated and has a compression index C,= 0.32 and a recompression C,= 0.018. The initial void ratio of the clay is 0.89 at mid-depth of the clay layer. The rock can be assumed to be impermeable. (a) Calculate the final settlement of the area due to consolidation of clay. (b) Calculate the settlement after a period of 3 years from the start of applying the surcharge. (c) If a very thin and highly permeable material existed below the clay layer, how would this thin layer affect the final and the 3 year settlement.

Fundamentals of Geotechnical Engineering (MindTap Course List)
Fundamentals of Geotechnical Engineering (MindTap Course List)
5th Edition
ISBN:9781305635180
Author:Braja M. Das, Nagaratnam Sivakugan
Publisher:Braja M. Das, Nagaratnam Sivakugan
Chapter10: Shear Strength Of Soil
Section: Chapter Questions
Problem 10.22P
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Question 2 Ricky won a lottery last month and decided to build a bungalow for his family. His consultant has employed a contractor to carry out a site investigation on the land that he is going to build his bungalow. It was found that a 6m of sand overlies a 4m layer of clay, below which is a very strong rock stratum. The water table is located at 2m below the surface of the sand, as shown in Figure Q2. The engineer has decided to use a surcharge of 50kN/m² to consolidate the soil, such that the settlement induced by the construction is minimised. 6m 4m I 2m 50kN/m² ↓↓↓↓↓↓↓↓↓ Sand Clay Rock Figure Q2 W.T. Soil properties: For the sand above the water table, it has a unit weight of 17 kN/m³, whilst the saturated sand has a saturated unit weight of 19 kN/m³. For the clay, the saturated unit weight is 16 kN/m³ and the coefficient of consolidation c, is 1.26m²/year. The clay is normally consolidated and has a compression index Cc= 0.32 and a recompression C,= 0.018. The initial void ratio of the clay is 0.89 at mid-depth of the clay layer. The rock can be assumed to be impermeable. (a) Calculate the final settlement of the area due to consolidation of clay. (b) Calculate the settlement after a period of 3 years from the start of applying the surcharge. (c) If a very thin and highly permeable material existed below the clay layer, how would this thin layer affect the final and the 3 year settlement.
Transcribed Image Text:Question 2 Ricky won a lottery last month and decided to build a bungalow for his family. His consultant has employed a contractor to carry out a site investigation on the land that he is going to build his bungalow. It was found that a 6m of sand overlies a 4m layer of clay, below which is a very strong rock stratum. The water table is located at 2m below the surface of the sand, as shown in Figure Q2. The engineer has decided to use a surcharge of 50kN/m² to consolidate the soil, such that the settlement induced by the construction is minimised. 6m 4m I 2m 50kN/m² ↓↓↓↓↓↓↓↓↓ Sand Clay Rock Figure Q2 W.T. Soil properties: For the sand above the water table, it has a unit weight of 17 kN/m³, whilst the saturated sand has a saturated unit weight of 19 kN/m³. For the clay, the saturated unit weight is 16 kN/m³ and the coefficient of consolidation c, is 1.26m²/year. The clay is normally consolidated and has a compression index Cc= 0.32 and a recompression C,= 0.018. The initial void ratio of the clay is 0.89 at mid-depth of the clay layer. The rock can be assumed to be impermeable. (a) Calculate the final settlement of the area due to consolidation of clay. (b) Calculate the settlement after a period of 3 years from the start of applying the surcharge. (c) If a very thin and highly permeable material existed below the clay layer, how would this thin layer affect the final and the 3 year settlement.
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