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Meaningful empirical correlation between Su and Phi in cohesive silty clay soils

thread260-479072

Meaningful empirical correlation between Su and Phi in cohesive silty clay soils

Meaningful empirical correlation between Su and Phi in cohesive silty clay soils

(OP)
Can anyone point me towards work that has been done on this please

RE: Meaningful empirical correlation between Su and Phi in cohesive silty clay soils

There are NO meaningful correlations between Su and Phi. These properties are not related, period.

Mike Lambert

RE: Meaningful empirical correlation between Su and Phi in cohesive silty clay soils

What tests are you getting Su or Phi from?

RE: Meaningful empirical correlation between Su and Phi in cohesive silty clay soils

Below are for fine grained plastic soils.
My preference in order of reliability for Su:
1. Unconsolidated undrained triaxial
2. Unconfined compression
3. In-situ vane shear
4. Mini vane shear
5. Pocket Penotometer
6. SPT blow count coorelation

My preference in order of reliability for Phi:
1. Consolidated undrained with pore water pressure measurements traixial
2. Consolidated drained triaxial
3. Fully softened correlation based on phi and clay fraction
4. Peak phi based on plasticity index

Mike Lambert

RE: Meaningful empirical correlation between Su and Phi in cohesive silty clay soils

Su is affected by moisture content, the effective friction angle is not

RE: Meaningful empirical correlation between Su and Phi in cohesive silty clay soils

People bash SPT to Su correlations a lot. I agree there is some issues but I have always found them to be reasonable, in cohesive material which is stronger than firm ~50kPa plus.

Likely an unpopular opinion, but I would put SPT correlation above PP and mini shear vane!!! I dont do many PP or MSV so maybe I dont have enough information....

RE: Meaningful empirical correlation between Su and Phi in cohesive silty clay soils

EireChch,

I agree SPT, PP, mini torvanes all have their problems. In some soils one is better than the others, in other soils the ranking switches. Really depends on teh soils and, in the case of the PP and mini torvanes it depends on who is running the test.

Mike Lambert

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