estimating consolidation curve from basic soil data
estimating consolidation curve from basic soil data
(OP)
I have the sieve analysis results, specific gravity, density for naturally consolidated soil... is there anyway where i can estimate the Consolidation curve of this soil.





RE: estimating consolidation curve from basic soil data
RE: estimating consolidation curve from basic soil data
If the natural moisture content is at (near) the liquid limit, you'd be safe anticipating that the soil is normally consolidated.
If you had undrained shear strength, you could relate that to the overburden pressure and then see whether the shear-strength v. effective overburden pressure was within the "norms" for normally consolidated soil. If not then you would have some degree of overconsolidation.
All this stuff is like reaching around your back to scratch your elbow. For several hundred bucks and the cost for shelby tube sampling, you can just get a consolidation test.
Good luck - others may have different opinions.
f-d
¡papá gordo ain’t no madre flaca!
RE: estimating consolidation curve from basic soil data
I do not have Atterberg's limits that would lead to Consolidation characteristics (WOOD,1991).
By the way I do not know if any of you uses Soil Vision (Knowledge Based program) .. if yes.. can this program help in this situation
RE: estimating consolidation curve from basic soil data
Interesting problem.
f-d
¡papá gordo ain’t no madre flaca!
RE: estimating consolidation curve from basic soil data
Now let us assume that we can get the permebility function
k(e) from the grain size distribution (say using Hazen's function). Can permeability function k(e) lead to the consolidation curve p'(e).
RE: estimating consolidation curve from basic soil data
f-d
¡papá gordo ain’t no madre flaca!
RE: estimating consolidation curve from basic soil data
RE: estimating consolidation curve from basic soil data
If I cannot predict it from the above data , I will assume it based on the available literature.
Best regards
RE: estimating consolidation curve from basic soil data
Good Luck.
f-d
¡papá gordo ain’t no madre flaca!
RE: estimating consolidation curve from basic soil data
-Please note that the normally consolidated soil has a moisture content that is close to its plastic limit PL and not to its liqid limit
-Your point is smart. However, by considering the soil responding with its Cu we are not considering it as elastic, instead we assume it as elastoplastic (just like Mohr coloumb but with zero friction). The coupled analysis ( deformation of soil due to dissipation of water) is still there. But the soil will be considered failing when the shear stress = Cu. In the case of assuming that the soil behaves according to Odemetric curve P'(e) then the soil will harden upon reaching the yield (plastic strain) and not fail instantly. When encountering low permeability (e.g embankment of fine grained soils being raised) it is justified to consider the behaviour observed in UU triaxial test
RE: estimating consolidation curve from basic soil data
What information do you have on the Atterberg limits and the natural moisture content? Can you provide natural density and specific gravity? Do you have any undrained shear strength (either via UU or pocket penetrometer)? What is your end game objective for this. . . . ?
f-d
¡papá gordo ain’t no madre flaca!
RE: estimating consolidation curve from basic soil data
a:Both
q.What information do you have on the Atterberg limits and the natural moisture content? Can you provide natural density and specific gravity?
a.No Atterberg limits are given. Void ratio, moisture content, specific gravity are known
q. Do you have any undrained shear strength (either via UU or pocket penetrometer)?
a.No
q.What is your end game objective for this. . . . ?
a.Stability analysis considering transient/coupled behavior of the system
RE: estimating consolidation curve from basic soil data
f-d
¡papá gordo ain’t no madre flaca!
RE: estimating consolidation curve from basic soil data
"SIGMA/W can be used together with SEEP/W to perform a fully-coupled consolidation analysis. When these two integrated products are run simultaneously,
SIGMA/W calculates the deformations resulting from pore-water pressure changes while SEEP/W calculates transient pore-water pressure changes. This procedure is
used to simulate the consolidation process in both saturated and unsaturated soils. A fully-coupled analysis is required to correctly model the pore-water pressure
response to an applied load. In certain cases, the pore-water pressure increase under an applied load can be greater than the applied load. This phenomenon is
known as the Mendel-Cryer effect. Figure 1-8 shows a SIGMA/W analysis of a saturated triaxial sample with an applied lateral load of 100 kPa. The initial pore-
water pressure before loading is zero. Figure 1-9 shows the pore-water pressure response with time at the center of the sample. The pore-water pressure rises to
about 110 kPa, (110% of the applied load), before it gradually decreases".
RE: estimating consolidation curve from basic soil data
One way to approach this (perhaps) is to just do a parametric evaluation (once the model is set up) as a sensitivity study using input parameters that are "typical" for the material.
I wish you well and hope you fill us in on the details as they develop.
f-d
¡papá gordo ain’t no madre flaca!