Empirical correlation between the shear-wave velocity and the dynamic probing heavy test

case study, Varaždin, Croatia

Stjepan Strelec (Author), Davor Stanko (Author), Mario Gazdek (Author)

Abstract

Varaždin is located in the north-western part of Croatia in shallow quaternary alluvial sediments of the Drava River basin. Local site effects due to the alluvial soft sediments can play a crucial role in the amplification of seismic-wave ground motions. The shear-wave velocity (VS) is one of the most important parameters for determining dynamic soil properties and ground-response analyses. The seismic surface wave method (MASW) is the simplest and a very efficient way of measuring the shear-wave velocity in the field. The Dynamic Probing Heavy (DPH) test is suited to determining the soil strength and the soil deformation properties. However, there are a lack of correlations between the shear-wave velocity and the DPH tests (VS - NDPH) in the literature. In this paper we present empirical correlations between the shear-wave velocity VS and the soil penetration resistance NDPH with: a) raw (original) NDPH data: VS = 97.839·NDPH0.395, (R2 = 0.723); b) a groundwater correction NDPH data: VS = 92.998·NDPH0.363 (R2 = 0.815). From the measured DPH data, the shear-wave velocity (VS), the shear modulus (Go) and the Young’s modulus (Eo and Er) were estimated. Two different approaches (low vs. high strain) were compared, and the results were found to be in good agreement when the relative difference between the velocities is small and smooth. Dynamic probing tests are good for studying a discrete point of interest in a large field area based on preliminary seismic tests. The suggested correlation VS - NDPH can be used for a rough estimation of VS from NDPH (they are site-specific, and so not applicable worldwide). In this way valuable information about dynamic soil properties can be extracted for ground-response analyses and the study of local site effects.

Keywords

hitrost strižnega valovanja;empirične korelacije;dinamični elastični moduli;dinamične lastnosti tal;Varaždin;

Data

Language:	English
Year of publishing:	2016
Typology:	1.01 - Original Scientific Article
Organization:	UM FGPA - Faculty of Civil Engineering, Transportation Engineering and Architecture
UDC:	550.3:624.131
COBISS:	302728448
ISSN:	1854-0171
Parent publication:	Acta geotechnica Slovenica
Views:	1342
Downloads:	74
Average score:	0 (0 votes)
Metadata:

Other data

Secondary language:	Slovenian
Secondary title:	Empirična korelacija med hitrostjo strižnega valovanja in dinamičnim penetracijskem preizkusom
Secondary abstract:	Varaždin se nahaja v severozahodnem delu Hrvaške na mestu plitvih kvartarnih aluvialnih sedimentov reke Drave. Aluvialni mehki sedimenti lahko igrajo ključno vlogo pri ojačanju gibanja potresnih valov v tleh. Hitrost strižnega valovanja (VS) je eden izmed najbolj pomembnih parametrov za določanje dinamičnih lastnosti tal in analizo odziva tal. Metoda seizmičnega površinskega valovanja (MASW) je najenostavnejši in zelo učinkovit način za merjenje hitrosti strižnega valovanja na terenu. Dinamični penetracijski preizkus (DPH) je primeren za določanje parametrov trdnosti in deformacijskih lastnosti tal. V literaturi manjkajo korelacije med hitrostmi strižnega valovanja in preizkusi DPH (VS - NDPH). V tem prispevku predstavljamo empirične korelacije med hitrostmi strižnega valovanja VS penetracijskim odporom NDPH za: a) neobdelane (originalne) NDPH podatke: VS = 97.839·NDPH0.395, (R2 = 0.723); b) podatke NDPH s korekcijo za talno vodo: VS = 92.998·NDPH0.363 (R2 = 0.815). Iz izmerjenih podatkov DPH so bili ocenjeni hitrost strižnega valovanja (VS), strižni modul (Go) in Youngova modula (Eo in Er). Primerjali smo dva različna pristopa (za majhno in veliko deformacijo), iz rezultatov pa smo ugotovili, da se dobro ujemajo, ko je relativna razlika med hitrostmi majhna in gladka. Dinamični penetracijski preizkusi so dobri za preučevanje točno določene točke v velikem polju območja, ki temelji na predhodnih seizmičnih preizkusih. Predlagana korelacija VS - NDPH se lahko uporablja za grobo oceno VS iz NDPH (vrednosti so specifične za prikazano lokacijo, zato se ne morejo uporabljati splošno). Na ta način so lahko pridobljene koristne informacije o dinamičnih lastnostih tal za analizo odziva tal in študij lokalnih vplivov.
Secondary keywords:	hitrost strižnega valovanja;MASW;DPH;empirične korelacije;dinamični elastični moduli;dinamične lastnosti tal;
URN:	URN:SI:UM:
Type (COBISS):	Scientific work
Pages:	str. 2-15
Volume:	ǂVol. ǂ13
Issue:	ǂ[no.] ǂ1
Chronology:	2016
ID:	10941542