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# Skempton coefficient A

## Skempton coefficient A

(OP)
Can someone explain why Skempton's A has negavite values for OC clays? i.e. why the pore pressure becomes negative?

### RE: Skempton coefficient A

Pick up Lambe and Whitman's Soil Mechanics (SI Version) - Chapter 26 explains Pore Pressure Developed during Undrained Loading. Heavily overconsolidated soils tend to expand upon loading and develop negative pore pressures (see section 26.6).

### RE: Skempton coefficient A

Not sure if I can improve on BigH, but the Holtz Kovacs Sheahan textbook (previously just Holtz Kovacs) also has a decent explanation of pore pressure, dilative soils, and Dr. Skempton's theoretical basis and coefficients. Chapters 12 and 13. If you have the older text, similar material. In very simple terms, you might think of dilation as a negative poisson ratio, as compared to typical structural materials.

### RE: Skempton coefficient A

(OP)
Great, thanks guys.

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