a) Discuss THREE (3) of the methods can be applied in estimating the immediate settlement for...

 

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a) Discuss THREE (3) of the methods can be applied in estimating the immediate settlement for fine grained by providing the relevant formulas and assumptions made for each. (6 marks) b) A square foundation of 5 m x 5 m as shown in FIGURE Q1(b) is founded at a depth of 2.0 m in a sand layer of 6.0 m thick and having a unit weight of 20 kN/m. A sand layer overlying a sandy clay layer of 3.0 m thick and underlying the sandy clay layer is a clay layer of 7.0 m thick. The foundation is to transmit a uniform contact pressure of 180 kPa. Determine; i) immediate settlement (s.) of sand layer using Meyerhof (1974) method. i) average immediate settlement (s.) in the both clay layers using expression suggested by Janbu et al., 1956. i) total immediate settlement for all the soil layers. Related information is provided in Appendix1 to assist the calculation. (14 marks) 2.0 m q= 180 kPa y= 20 kN/m 9. - 3800 kPa B= 5.0 m 4.0 m sand layer E, = 35 MN/m 3.0 m v= 0.35 sandy clay E, = 46 MN/m v= 0.5 clay 7.0 m FIGURE Q1(b) a) Discuss THREE (3) of the methods can be applied in estimating the immediate settlement for fine grained by providing the relevant formulas and assumptions made for each. (6 marks) b) A square foundation of 5 m x 5 m as shown in FIGURE Q1(b) is founded at a depth of 2.0 m in a sand layer of 6.0 m thick and having a unit weight of 20 kN/m. A sand layer overlying a sandy clay layer of 3.0 m thick and underlying the sandy clay layer is a clay layer of 7.0 m thick. The foundation is to transmit a uniform contact pressure of 180 kPa. Determine; i) immediate settlement (s.) of sand layer using Meyerhof (1974) method. i) average immediate settlement (s.) in the both clay layers using expression suggested by Janbu et al., 1956. i) total immediate settlement for all the soil layers. Related information is provided in Appendix1 to assist the calculation. (14 marks) 2.0 m q= 180 kPa y= 20 kN/m 9. - 3800 kPa B= 5.0 m 4.0 m sand layer E, = 35 MN/m 3.0 m v= 0.35 sandy clay E, = 46 MN/m v= 0.5 clay 7.0 m FIGURE Q1(b)

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