Re-assessment of the shear strength of the oligocene clay from the Buda area based on the site investigation of the Metro line 4
Horv aacute th Gy., B. M oacute cz aacute r · IOS Press eBooks · 2011
On the Buda side of Budapest the Metro line 4 is constructed in a length of several kilometres in the Oligocene clay formation known as Kiscell clay. For the line and the stations a great number of boreholes with continuous sampling was carried out. Using core samples taken from depths of 10 to 40 metres triaxial compression tests were carried out on large diameter (10 cm) specimens. The original objective of the tests was to obtain geotechnical parameters required for the design of the tunnel and the station structure. The processing and evaluation of the results of the great number of tests made it possible to re-assess on the basis of available former investigations the shear strength, deformations and existing state of the highly overconsolidated stratum which is as firm as soft rocks, which however experienced expansion to a degree decreasing with depth.