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Settlement
Settlement analysis using DMT (constrained modulus)
Constrained modulus MDMT [MPa] is defined as the vertical drained confined tangent modulus at σvo. MDMT is obtained from dilatometer test.
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 oedometer 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 method. 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. (1999) " The Flat Dilatometer and its applications to Geotechnical Design ", Lecture notes (90 pp) Intnl Seminar on DMT held at the Japanese Geot. Society, Tokyo, 12 Feb 1999
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