TEST TO DETERMINATE COLLAPSE POTENTIAL
TEST TO DETERMINATE COLLAPSE POTENTIAL
(OP)
How can I meassure the collapse potential of a soil?
Do you have information about th collapsible soils characteristics?
Thanks and Best regards
Do you have information about th collapsible soils characteristics?
Thanks and Best regards





RE: TEST TO DETERMINATE COLLAPSE POTENTIAL
To measure the collapsing potential of this type of soil, you may use an oedometer/consolidation ring to prepare an undisturbed sample (similar preparation as consolidation test). When water is introduced to this specimen, the sample may start to collapse, ie. change in height... dh/h or change in initial void ratio e/eo may be used as the degree of collapse of the soil. This is like a reverse test to determine swelling potential of soils.
hope that this helps.
RE: TEST TO DETERMINATE COLLAPSE POTENTIAL
Danny McCook
RE: TEST TO DETERMINATE COLLAPSE POTENTIAL
RE: TEST TO DETERMINATE COLLAPSE POTENTIAL
Collapse do occure in all types of soils including sand, silt ,gravel or even compacted soils. Wetting induced collapse may occure in compacted soils.
Jennings and Knight (1975) had corelated collapse potential with degree of sevarity to the structure. Such as if
Collapse potential Problem
0 No problem
1-5 Moderate trouble
5-10 Sever trouble
10-20 Very danger
For determination of collapse of soils, following methods are available: i) Single Oedometer collapse test
ii) Double oedometer test
iii) Down hole test
iv) Double triaxial collapse test
v) Laboratory infiltraion test
vi) Field infiltration test
vii) Triaxial A-value corelation with collapse potentials.
RE: TEST TO DETERMINATE COLLAPSE POTENTIAL
RE: TEST TO DETERMINATE COLLAPSE POTENTIAL
Generally speaking, the collapse will happen within the first 24 hours. In sands and silts, it's immediate (i.e. within 30 minutes.)
But in certain heavy clays that may swell as well as collapse, you may need to wait 72 hours for a final answer.
Sample quality is key - keep in mind that even sampling with a pushed Shelby tube can result in a compressed (i.e. densified) sample. Block samples are the best, particularly in the silts and sands -
Please see FAQ731-376 for great suggestions on how to make the best use of Eng-Tips Fora.