Stress history in CLAY (KD-OCR-K0)

KD contains information on stress history

Stress History Clay

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

 

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

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

CLAY: KD correlated to OCR

Experimental
Kamei & Iwasaki 1995

Theoretical
Finno 1993

Theoretical
Yu 2004

CLAY: KD correlated to K0

Experimental
Marchetti 1980

Theoretical
2004 Yu

Quantify σ'h relaxation behind a landslide (K0)

Case History: Landslide in Milazzo, Sicily

landslide
σ’h obtained using K0 from DMT
Horizontal stress

Other sources from Interpretation & Results