2. Bascd on the following figure, all layers shown in the figure are fully saturated.The pressure applying from a building to the ground surface is about 900 kPa.Assume Gs = 2.7 for each layer.(a) Determine the cffective stress for a soil element at the middle of each layer.(b) Determine the vertical stress increase at the middle of the clay layer under thecenter of the foundation (10 mx20 m).(c) Determine the primary consolidation settlement of the clay layer at the centerof the foundation if the clay is overconsolidated with an OCR=1.5.(d) How long will consolidation settlement take for 50% consolidation to occurin the field if the value of C, = 10 m2/year.20 m10 m20 mLightly cemented (calciumcarbonate) sand/gravel= 17 kN/mClay properties:w = 55%C = 0.4C, = 0.0520 m3 mSoft clay15 mSand and gravelw=10%Rock

γclay=G+e1+eγwe=wG=2.70.55=1.485so,γclay=G+e1+e=2.7+1.4852+1.4859.81=16.52kNm3

2. Based on the following figure, all layers shown in the figure are fully satura The pressure applying from a building to the ground surface is about 900 Assume Gs = 2.7 for each layer. (a) Determine the effective stress for a soil element at the middle of cach lay (b) Determine the vertical stress increase at the middle of the clay layer under center of the foundation (10 m-20 m). (c) Determine the primary consolidation settlement of the clay layer at the co of the foundation if the clay is overconsolidated with an OCR-1.5. (d) How long will consolidation settlement take for 50% consolidation to o in the field if the value of C, 10 m/ycar. 20 m

2. Based on the following figure, all layers shown in the figure are fully satura The pressure applying from a building to the ground surface is about 900 Assume Gs = 2.7 for each layer. (a) Determine the effective stress for a soil element at the middle of cach lay (b) Determine the vertical stress increase at the middle of the clay layer under center of the foundation (10 m-20 m). (c) Determine the primary consolidation settlement of the clay layer at the co of the foundation if the clay is overconsolidated with an OCR-1.5. (d) How long will consolidation settlement take for 50% consolidation to o in the field if the value of C, 10 m/ycar. 20 m

Principles of Foundation Engineering (MindTap Course List)

9th Edition

ISBN:9781337705028

Author:Braja M. Das, Nagaratnam Sivakugan

Publisher:Braja M. Das, Nagaratnam Sivakugan

Chapter10: Mat Foundations

Section: Chapter Questions

Problem 10.7P

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