Geotechnical Engineering

DHARM

N-GEO\ANS.PM5 879

ANSWERS TO NUMERICAL PROBLEMS 879

CHAPTER 14

14.11. 90 kN/m^2 , 45 kN/m^2 14.12. 100 kN/m^2 14.13. 488 kN/m. run 14.14. 85 kN/m^2 14.15. 540 kN/m^2
14.16. 290 kN/m^2 14.17. 148 kN/m^2 14.18. 1.60 m; 1.35 m 14.19. 1.6 m 14.20. 2m; 2m (since water table
rises to the ground surface). 14.21. 315 kN/m^2 14.22. 4 m × 8 m 14.23. 553.7 kN/m^2 ; 2.26. 14.24. 3.5
14.25. 1944 kN 14.26. 492 kN/m^2 (Shear failure governs the design) 14.27. 200 kN/m^2 ; 450 kN.

CHAPTER 15

15.10. Size ranges from 1 m to 2 m 15.11. 1848 kN; 1987 kN (Useful width approach) 15.12. 2.1 m sq.

and 2.4 m sq. 15.13. 1.5 m × 7.0 m 15.14. 1 m and 2.5 m wide and 6 m long. 15.15. 103,680 kN; 15,360

kN

CHAPTER 16

16.10. 200 kN 16.11. 250 kN 16.12. 17.5 mm 16.13. 305 kN 16.14. 1012.5 kN 16.15. 580 kN 16.16. 3580

kN 16.17. 852 kN 16.18. 822 kN

CHAPTER 17

17.17. 17% 17.18. 10 cm each.

CHAPTER 18

18.13. First sampler ; Ar = 10.9% 18.14. 11.8% 18.15. N = 25 18.16. N = 40 18.17. 58.2 kN/m^2 18.18.
CI = 2.94%; Co = 2.78%; Ar = 18.43%.

CHAPTER 19

19.18. De = 6 m, D 2 = 3 m, tseal = 1.25 m. 19.19. tseal = 0.9 m (Perimeter shear stress = 268 kN/m^2 ). 19.20.
The Caisson is unstable; total thickness of sand ballast required for easy sinking and to ensure stability
= 2.10 m; After installation, net maximum pressure = 202 kN/m^2 and net minimum pressure = 136
kN/m^2. 19.21. Allowable lateral load for rotation about the base = 1,212 kN. 19.22. Allowable lateral
load for rotation about the base = 3,524 kN.

CHAPTER 20

20.25. fn = 21.34 cps. 20.26. Cu = 40,000 kN/m^3. 20.27. T = 0.371; transmitted force = 44.5 kN. 20.28.
D = 0.078. 20.29. Pz = 17,355 kN. 20.30. A 1 = 2.82 mm; A^2 = 2.92 mm.