Capillarity Capillary action cause negative pore water pressure above the ground water.(so the effective stress is increased and the pore water pressure is negative)(note: the effective is more than total) piezometer 2m, 19 kn/ms 3m 17 knm3 1m capillarity Point o = YsatZ(kN/m²) U = YwZ o' = 0 - u A Seepage force At A the seepage force acts to push the particles and is positive. At B the force is tends to separate (uplift) and is negative. If we have head loss AH and L (flow distance) the seepage force is (per unit volume) j. = So for point A: The vertical effective stress: Point oi =y'Z – j,Z 2mwater So for point B: 2.5 10*5-2.5*5 A The vertical effective stress: B 10*2.5+2.5*5 og = y'Z + j„Z B

Capillarity Capillary action cause negative pore water pressure above the ground water.(so the effective stress is increased and the pore water pressure is negative)(note: the effective is more than total) piezometer 2m, 19 kn/ms 3m 17 knm3 1m capillarity Point o = YsatZ(kN/m²) U = YwZ o' = 0 - u A Seepage force At A the seepage force acts to push the particles and is positive. At B the force is tends to separate (uplift) and is negative. If we have head loss AH and L (flow distance) the seepage force is (per unit volume) j. = So for point A: The vertical effective stress: Point oi =y'Z – j,Z 2mwater So for point B: 2.5 105-2.55 A The vertical effective stress: B 102.5+2.55 og = y'Z + j„Z B

Fundamentals of Geotechnical Engineering (MindTap Course List)

5th Edition

ISBN:9781305635180

Author:Braja M. Das, Nagaratnam Sivakugan

Publisher:Braja M. Das, Nagaratnam Sivakugan

Chapter7: Seepage

Section: Chapter Questions

Problem 7.1P

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