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GEO5

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Settlement Analysis Using DMT (Constrained Soil Modulus)

Constrained modulus MDMT [MPa] is defined as the vertical drained confined tangent modulus at σvo. Modulus MDMT is obtained from dilatometric tests (DMT).

If the value of the constrained modulus MDMT is not available, it is possible to input the coefficient of volume compressibility mV [m2/MN] (determined from the oedometric test) and the program carries out the respective transformation:

where:

MDMT

-

constrained modulus

mV

-

coefficient of volume compressibility

The analysis employs the constrained modulus MDMT or coefficient of volume compressibility mV and is based on Marchetti theory. This approach being based on linear elasticity, provides a settlement proportional to the load and is unable to provide non linear predictions.

The settlement of the ith layer is then provided by:

where:

σz,i

-

vertical component of incremental stress in the middle of ith layer

hi

-

thickness of the ith layer

MDMT

-

constrained modulus

Literature:

Marchetti, S., Monaco, P., Totani, G. & Calabrese, M.: The Flat Dilatometer Test (DMT) in soil investigations. A Report by the ISSMGE Committee TC16, University of L'Aquila, Italy, 2001, 48 p.