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# Excess Pore Water Calculation from CPT soundings

## Excess Pore Water Calculation from CPT soundings

(OP)
I am trying to use the Kajima Technical Research Institute, KTRI (Takesue, et al. 1998) method for pile design. In order to calculate the pile side friction you must know the delta u (excess pore water pressure). I believe that a pore water dissipation test can be performed in a clay to find this value, but what about in sands or mixed soil types? I am in Charleston. I have attached a paper that might be helpful.

I already use the LCPC method but would like to compare it to the KTRI method.

### RE: Excess Pore Water Calculation from CPT soundings

Just curious...are you using software for the LCPC or a spreadsheet? What software?

### RE: Excess Pore Water Calculation from CPT soundings

I'm not familiar with that method. However, generally speaking, in relatively clean sands it is conventionally assumed that it will behave drained (i.e. Δu = 0) for monotonic loading. Cyclic loading may be different - you have to account for the permeability to determine the amount of drainage which happens simultaneously. Other soil types, such as silt, may lie somewhere in between a clay and a sand. It really all depends on your type of loading and the amount of drainage which is permitted.

### RE: Excess Pore Water Calculation from CPT soundings

(OP)
I use CPet-IT2 by Robertson. It's affordable and pretty easy to use.

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