Heave
Heave
(OP)
I am trying to calculate the elastic heave within a deep basement 8 m deep and with an area of approximately 50 m2. The underlying strata is Gault Clay.
I believe that this is done by calculating this as elastic settlement. Using traditional stress distribution methods appear unrealistic for this type of structure.
Can anyone tell how to calculate stress distribution/depths of influence for a structure of this size or raft foundations?
I believe that this is done by calculating this as elastic settlement. Using traditional stress distribution methods appear unrealistic for this type of structure.
Can anyone tell how to calculate stress distribution/depths of influence for a structure of this size or raft foundations?





RE: Heave
RE: Heave
Hope this helps.
f-d
¡papá gordo ain’t no madre flaca!
RE: Heave
RE: Heave
The factor of safety against heave is (5.7C)/ ((gama*H)-(1.41*C*H/B)) where C= cohesion, gama= unit weight, H= depth of cut & B=width of cut. FS sould be>1.5
There are some other formulas that account for end effects etc. These values are probably somewhat conservative, but have been used for many years.
Movements due to elastic relief are not large and probably do not effect construction. Heave on the other hand can be significant and can disrupt construction. If you do look at FE solutions, be sure you have high quality data and be sure to look at bearing capacity as well as elastic movement.