Theoretically, pressure envelops are linear and maximum earth pressure occurs at the bottom (3H/4 - 1H) of the structure. But in field monitoring with pressure sensors, earth pressure envelops are non - linear and maximum earth pressures are maximum at H/2 - 2H/3 of the wall.
why standard theories are underpredicting or over predicting the field values?
Dear Jayatheja Muktinutalapati
The stiffness of the wall, its ability to move and deflect, play a crucial role in soil pressure envelope in uniform soil. In the case of real soil profiles, it may happen that the increased soil internal friction or appearing cohesion provokes the decrease of soil pressure despite of higher vertical stress.
If you consider various methods of vertical soil support calculations (especially for flexible structures) , the soil pressure envelopes are often modified to take into account this phenomena.
From my experience. Usually the total active pressure is corresponding to the theoretical value but its position may vary depending on the above mentioned factors.
Best regards
Is that higher than expected?
If yes, and is quite rectangular, reason is in material compaction behind the wall.
Filippo Forlani Sir,
In the case of active and at - rest conditions, It is lower or nearly equal to theoretical values.
But in passive conditions, field monitoring values are greater than theoretical values.
then it should be better of what expected, which numbers did you used to get active and passive coefficient? (I mean residual or peak friction angle?)
Filippo Forlani Sir,
I considered peak parameters for obtaining active and passive coefficients.
- Badges
- Science topic
- Similar topics
- Correction