Stress history in CLAY (KD-OCR-K0)

K_D contains information on stress history

same formula as K₀: (P₀ –U₀) → σ’h
K_D is an ‘amplified’ K₀, because (P₀ – U₀)

is an ‘amplified’ σ’h,
due to penetration K_D well correlated to K₀ and OCR (clay)

K_D = 2 in NC clay (OCR = 1)
K_D > 2 in OC clay (OCR > 1)

CLAY: K_D correlated to OCR

Experimental
Kamei & Iwasaki 1995

Theoretical
Finno 1993

Theoretical
Yu 2004

CLAY: K_D correlated to K₀

Experimental
Marchetti 1980

Theoretical
2004 Yu

Quantify σ'h relaxation behind a landslide (K₀)

Case History: Landslide in Milazzo, Sicily

Other sources from Interpretation & Results

Niche Silts

Interpretation Formulae

Modulus M

Stress history in Sand

Dissipation Test

Stratigraphy (ID)

Strength in clay (Su)