This preview shows page 1. Sign up to view the full content.
Unformatted text preview: water with a surface area >> than mass, clay particles carry a negative charge and thus cohere in the presence of water (bipolar molecules) y-intercept on the plot of normal stress versus shear strength cohesion increases with soil moisture but only to a threshold above which porewater pressure forces particles apart counteracting normal force and reducing friction pore pressure (p) portion of the normal stress supported by air and water in interstitial spaces when soil is saturated, p = porewater pressure (u) > 0 effective normal stress = normal stress - u, the stress exerted at grain contacts producing internal friction positive porewater pressure is a buoyant force, that is, is supports part of the weight of the soil and therefore wet sediment has very low shear strength...
View Full Document
- Fall '10