11. The pore water pressure is essential in differentiating a soil's total stress from its effective stress . 12. The term'cyclic mobility'refers to the mechanism of progressive reduction of effective stress due to cyclic loading. 13. From the effective stress equation, the change in u directly effects the effective stress by the equation: 14. From the effective stress equation, the change in u directly effects the effective stress by the equation: 15. If water is being injected, the seepage force acts to separate the spheres and reduces the effective stress . 16. A typical reference strain for the approximate occurrence of zero effective stress is 5 % double amplitude shear strain. 17. Finally, the relationship between void ratio and effective stress is not independent of time, again proven by experimental results. 18. Effective stress is easy to disrupt by the application of additional forces; every footstep on a sand pile demonstrates this.19. A soil which is currently experiencing the maximum past vertical effective stress is said to be " normally consolidated ". 20. If stress reversal does not occur, zero effective stress is not possible to occur, then " cyclic mobility " takes place.
