Naslov
Shear moduli in Scandinavian clays ; measurements of initial shear modulus with seismic cones ; empirical correlations for the initial shear modulus in clay

Autori
Larsson, Rolf ; Mulabdić, Mensur

Izvornik
Report No. 40, Swedish Geotechnical Institute

Vrsta, podvrsta
Ostale vrste radova, izvještaj

Godina
1991

Ključne riječi
Scandinavian clay; shear modulus; seismic cone

Sažetak
The shear stress-strain relations in soils have mainly been studied in the laboratory. Comparisons with field tests, however, have shown that there are considerable disturbance and time-effects in the laboratory tests. The initial shear modulus should therefore preferably be determined by field tests. A large number of investigations have shown that the various methods of field testing with cross-hole and down-hole techniques normally give compatible results. Compatible results are also obtained when a seismometer is incorporated in an ordinary CPT probe and the shear wave velocity is measured at regular intervals as the penetration test proceeds. The shear wave is then normally created by a hammer-blow on a steel-bar pressed against the soil by the weight of the drill rig. This is a cost-effective method and the equipment is commercially available. From the results in this investigation, it appears that the shear deformations created in this way may exceed the "elastic" range of deformations in the upper parts of soft soil profiles. An evaluation of the shear strain in the test therefore ought to be made and the results corrected for excessive shear strains.

Izvorni jezik
Engleski

Znanstvena područja
Građevinarstvo

POVEZANOST RADA