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Öğe Comparison of Artificial Neural Networks models with correlative works on undrained shear strength(MAIK NAUKA/INTERPERIODICA/SPRINGER, 2009) Sivrikaya, O.In recent years, the Artificial Neural Network (ANN) modelling that has been used in the solution of the complex problems has gained an increasing interest in soil science. The ANN modelling is also getting more popular in soil mechanics applications. It is a preferable method among the other approaching methods because of having quick results in test phase in short time. This paper describes the ANN models for estimating undrained shear strength (S(u)) of cohesive soils from SPT (Standard Penetration Test) data with index properties in Turkey. The performance of the ANN models is investigated using different input variables such as measured N, corrected N (N(60)) value, natural water content (w(n)), liquid limit (w(L)), plasticity index (I(p)). In this study the ANN models are compared to empirical methods. The results indicate the superior performance of ANN models over the empirical methods.Öğe Comparison of fine-grained soils of the kolsuz and AraplA +/- areas in the Central Anatolia (NiCde, Turkey) in terms of geotechnical properties(PLEIADES PUBLISHING INC, 2013) Sivrikaya, O.; Hakbilir, S.Clayey soils are used in various industrial applications as raw material. However, they are also used both as materials and soils on which constructions are built in the geotechnical engineering. Therefore, estimation of soil behavior in terms of design is vital. In this context, it is necessary to determine the engineering properties of the soils. There are voluminous study on the geology, mineralogy and chemistry of the clayey soils in the Central Anatolia, NiC de (Turkey). However, not many studies deal with their geotechnical properties. In the current study, the engineering properties of clayey soils are determined through laboratory tests on the clayey soil samples taken from the AraplA +/- and Kolsuz areas and also the comparison is made between clayey soils in the AraplA +/- and Kolsuz areas considering their geotechnical properties. As a result, it is observed that the fine-grained soils of the Kolsuz area are inactive and have low plasticity (CL) with average w (L) of 32 and w (P) of 19. The fine-grained soils of the AraplA +/- area have high plasticity (MH) with average w (L) of 96 and w (P) of 57 and are active. It is also found that while the fine grained soils of the Kolsuz area has almost no swelling potential, those of the AraplA +/- area has high swelling potential based on their mineralogical contents, consistency limits, activities and swelling pressures.Öğe Critical-state parameters of an unsaturated residual clayey soil from Turkey(ELSEVIER SCIENCE BV, 2007) Kayadelen, C.; Sivrikaya, O.; Taskiran, T.; Guneyli, H.This paper deals with the evaluation of the critical-state parameters with respect to the matric suction for saturated and unsaturated undisturbed residual clayey soils from Turkey. In order to conduct the unsaturated triaxial compression testing procedures a conventional triaxial compression apparatus was redesigned. The data for critical-state conditions from these tests are presented with respect to matric suction, based on the critical-state parameters of M, q(0), Gamma, lambda, which is commonly proposed by many authors. The critical state of the unsaturated samples is compared with that of the saturated samples. This experimental study has demonstrated that matric suction has no influence on parameters of M and lambda. The parameters of M and lambda are approximately 0.85 and 0.074 respectively for saturated and unsaturated conditions. The relationships between matric suction (u(a)-u(w)) and the intercepts q(0) and Gamma have been observed as nonlinear, and thus they can be defined as a function of matric suction (u(a)-u(w)). Furthermore, a method is developed to predict the intercepts q(0) according to matric suction for unsaturated clayey soils. (c) 2007 Elsevier B.V. All rights reserved.Öğe Determination of undrained strength of fine-grained soils by means of SPIT and its application in Turkey(ELSEVIER SCIENCE BV, 2006) Sivrikaya, O.; Togrol, E.The Standard Penetration Test (SPT) is one of the oldest and the most common in situ test used in soil explorations. In the recent years with the advent of new technology and techniques in determining the drawbacks in SPT, several researchers have attempted to correlate corrected field measured values with several soil properties. In this context, corrections applied to field values have become critical. In this study a questionnaire including the performance of the standard penetration test and equipment used in practice in Turkey is circulated in order to determine the relevant correction factors. Thus the appropriate corrections are used in acquiring corrected SPT-N values. The relationships between SPT-N and the undrained shear strength (S-u) are examined from the statistical point of view by taking the test types and SPT corrections into consideration, and comparison is made with previous studies. It is observed that SPT corrections play an important role on the obtained correlation equations. In addition, the importance of the effects of test types on the correlations is also emphasized. The Standard Penetration Test is found to be sufficient for reliable assessment of S-u. (C) 2006 Elsevier B.V. All rights reserved.Öğe The 2001 Adana landslide and its destructive effects, Turkey(SPRINGER, 2008) Sivrikaya, O.; Kilic, A. M.; Yalcin, M. G.; Aykamis, A. S.; Sonmez, M.The current study deals with a catastrophic landslide that occurred due to heavy rainfall in Adana, Southern Turkey in 2001. The research area, which is one of the largest populated districts in Adana, and one of the most tropical places between the Middle East and southern Europe, has about 25,000 people. On the basis of geological and geotechnical surveys, the landslide phenomena and the effects of landslide are examined. To understand the slide mechanism of the landslide, ground reconnaissance, laboratory and in situ tests are conducted. It is observed that the clayey and silty layers of the site are heavily saturated due to extreme rainfall in winter, and consequently sheared. The landslide consists of a block sliding in the upper portions and a debris flow/soil flow component around the margins of the sliding blocks in the middle parts and at the toe. Although there was no loss of human life, it has caused significant economic losses. Besides, it is determined that if precautions are not taken around the landslide area, larger landslides could definitely occur in the future.
