EFFECTIVE STRESS
EFFECTIVE STRESS
(OP)
could anyone please tell us what the difference is between the principle of effective stress and the law/rule of effective stress for we are confused to differentiate them very clearly .
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS Come Join Us!Are you an
Engineering professional? Join Eng-Tips Forums!
*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail. Posting GuidelinesJobs |
|
RE: EFFECTIVE STRESS
If u consider sliding in a soil mass - it can occur in any plane. The stresses acting at any such point is inclined to the normal to the plane. Stresses thus evaluated are complex and have both normal and tangential component.
The principal plane is a plane acted upon by the normal stress only. And this stress is called Principal stress.
Therefore at every point considered in a soil mass there are three mutually orthogonal principal stresses.
A Mohr circle diagram and theory should be clear to u.
The resulting effective stresses are setup by stresses that control changes in volume and strength of a soil mass. Drainage conditions of a soil mass effects loads on it. The application of load on a saturated soil will be shared by the water and soil skeleton. Instances do exist ( depending on soil type ) where water in the soil voids carry the load and cause increase in pore water pressure or by the soil skeleton as particle contact stresses.
Terzaghi stated that the effective stress is equal to the total applied normal stress less pore water pressure. This is still valid.
Determination are from either consolidated undrained or drained tri axial shear tests.
Once u understand the above, the differentiation should become lot easier.
Books to check are:
G.N. Smith - Elements of Soil Mechanics &
M. J. Tomlinson - Foundation Design and Construction
RE: EFFECTIVE STRESS
RE: EFFECTIVE STRESS
RE: EFFECTIVE STRESS
RE: EFFECTIVE STRESS
As far as I can tell, they are the same thing under a slightly different name.
What is the difference between Karl Terzaghi and Charles Terzaghi? Same guy, slightly different names at different times in his life. (In his earlier days of work in the US, he published under "Charles.")