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Modulus of Subsoil Reaction Specified by Dilatometric Test (DMT)

Modulus of subsoil reaction kh [MN/m3] is determined by the following formula:

where:

kh

-

modulus of subsoil reaction [MN/m3]

MDMT

-

constrained modulus obtained from DMT [MPa]

B

-

characteristic length of sheeting structure (coefficient of reduction) [1 rm]

Values of coefficient B are depending on the depth of the excavation H [m], constrained modulus MDMT [MPa] and spacing of props.

Graphs for determination of coefficient B (source: [2], Figure 7, pp. 999)

Literature:

Monaco, P. and Marchetti, S..: Evaluation of the coefficient of subgrade reaction for design of multi-propped diaphragm walls from DMT moduli. Millpress, Rotterdam, 2004, pp. 993 – 1002, ISBN 90 5966 009 9.