TY - JOUR
T1 - Revisiting the CPT-based characterizations of a highway subgrade
AU - Kodicherla, Shiva Prashanth Kumar
AU - Nandyala, Darga Kumar
N1 - Funding Information:
The authors are grateful to Techniplan S.P.A private limited located in capital city Addis Ababa of Ethiopia for their cooperation in providing the raw data.
Publisher Copyright:
© 2019, © 2019 Informa UK Limited, trading as Taylor & Francis Group.
PY - 2019/7/3
Y1 - 2019/7/3
N2 - This paper revisits the cone penetration test (CPT) based characterizations derived from small strain shear modulus (G0) and seismic shear wave velocity (Vs). The need for this study is demonstrated through comparisons with existing CPT-Vs/CPT–G0 models. Among the literary correlations considered in the present study, some of them showed better performance. The previous correlations show an error margin ranging between −140% and +440% in estimating the G0, whereas the predicted Vs was underestimated by 16% or overestimated by 109%. The CPT-G0 correlations utilizing the proposed compressibility index (Icc) denotes the higher regression coefficient value which designates the advantageous stress normalization. It is found that there is a good agreement between the measured and predicted Vs with expected error limits of ± 4%. Moreover, the proposed correlations in this study might be applicable to site-specific conditions due to the limitation of data points pertinent to organic silts and clays category based on the unified soil classification system.
AB - This paper revisits the cone penetration test (CPT) based characterizations derived from small strain shear modulus (G0) and seismic shear wave velocity (Vs). The need for this study is demonstrated through comparisons with existing CPT-Vs/CPT–G0 models. Among the literary correlations considered in the present study, some of them showed better performance. The previous correlations show an error margin ranging between −140% and +440% in estimating the G0, whereas the predicted Vs was underestimated by 16% or overestimated by 109%. The CPT-G0 correlations utilizing the proposed compressibility index (Icc) denotes the higher regression coefficient value which designates the advantageous stress normalization. It is found that there is a good agreement between the measured and predicted Vs with expected error limits of ± 4%. Moreover, the proposed correlations in this study might be applicable to site-specific conditions due to the limitation of data points pertinent to organic silts and clays category based on the unified soil classification system.
KW - Cone penetration test
KW - relative density
KW - shear wave velocity
KW - small strain shear modulus
UR - http://www.scopus.com/inward/record.url?scp=85062464555&partnerID=8YFLogxK
U2 - 10.1080/17486025.2019.1581273
DO - 10.1080/17486025.2019.1581273
M3 - Article
AN - SCOPUS:85062464555
SN - 1748-6025
VL - 14
SP - 167
EP - 177
JO - Geomechanics and Geoengineering
JF - Geomechanics and Geoengineering
IS - 3
ER -