Evaluation Of The Liquefaction Potential Of Soil
Deposits Based On SPT And CPT Test Results
Author(s)
A. M. Hanna, D. Ural & G. Saygili
Abstract
In the literature, predictions for the occurrence of nonlinear soil liquefaction in
soil deposits have been investigated through numerous empirical methods. These
methods which are also known as ‘conventional techniques’ were derived from
several in-situ tests, laboratory tests and case records. An alternative general
regression neural network (GRNN) model that addresses the collective
knowledge built in a simplified procedure is proposed. To meet this objective, a
total of 3895 case records including twelve soil and seismic parameters driven
mostly from the cone penetration test (CPT) results are introduced into the
model. The data includes the results of field tests from the two major
earthquakes that took place in Turkey and Taiwan in 1999 and some of the
desired input parameters are obtained from correlations existing in the literature.
The soil liquefaction decision in terms of seismic demand and capacity is
determined by recognized simplified approach, namely a stress-based method
and a strain-based method. Furthermore, the liquefaction probability of soils with
significant fines is tested with the so-called Chinese Criteria. The proposed
GRNN model is developed in four phases, mainly: the identification phase,
collection phase, implementation phase, and verification phase. An iterative
procedure was followed to maximize the accuracy of the proposed model. The
case records were divided randomly into testing, training, and validation
datasets. The proposed GRNN model effectively explored the complex
relationship between the introduced soil and seismic input parameters and
validated the liquefaction decision.
Keywords: liquefaction, general regression neural networks, GRNN, Kocaeli
earthquake, Taiwan earthquake, cone penetration test results, standard
penetration test.
Keywords
liquefaction, general regression neural networks, GRNN, Kocaeli
earthquake, Taiwan earthquake, cone penetration test results, standard
penetration test.
Related Book
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