Naslov
The interpretation of CPTu, PMT, SPT and Cross- Hole tests in stiff clay

Autori
Kavur, Boris ; Dodigović, Filip ; Jug, Jasmin ; Strelec, Stjepan

Vrsta, podvrsta i kategorija rada
Radovi u zbornicima skupova, cjeloviti rad (in extenso), znanstveni

Izvornik
IOP Conference Series: Earth and Environmental Science, Volume 221, conference 1 / - : IOP Publishing, 2019

Skup
World Multidisciplinary Earth Sciences Symposium (WMESS 2018)

Mjesto i datum
Prag, Češka Republika, 03.09.2018. - 07.09.2018

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
Stiff Clay ; CPTu ; PMT ; SPT ; Cross-Hole

Sažetak
The paper presents comparative results of CPTu, PMT, SPT and CH (cross-hole) tests performed in stiff, heavily overconsolidated clay at a test location in Zagreb. This clay exhibits very high pore pressures generated during CPTu penetrations despite significant overconsolidation and relatively high values of shear strength and stiffness in its undisturbed, natural state. The clay is classified using the CPTu and CH test results in recently published soil classification charts based on the soil behaviour in (S)CPTu penetrations. The results of classifications indicate that the clay tested probably has a pronounced microstructure that is likely a consequence of the geological processes of cementation and aging. Effects of cementation and aging are manifested on very high shear wave velocities, as measured in cross-hole seismic tests, and consequently very high values of the small-strain modulus. The collapse of the soil structure at higher shear deformations results in volume contractions and softening behaviour after reaching the peak shear strength. The study shows a relatively good agreement between CPTu, PMT and SPT parameters and adequate correlations have been established between the cone resistance (CPTu), limit pressure (PMT) and number of blows (SPT). The in situ state and parameters of strength, stiffness and compressibility of the clay tested are estimated based on the in situ test parameters as well as comparative laboratory test results obtained on undisturbed soil samples. Existing empirical correlations developed for the interpretation of CPTu test results are mainly from young and uncemented soils without microstructure and therefore, the results shown here are important for better understanding of the structured soil behaviour characteristics (stiffness, strength, and compressibility).

Izvorni jezik
Engleski

Znanstvena područja
Geofizika, Građevinarstvo, Rudarstvo, nafta i geološko inženjerstvo

POVEZANOST RADA