Abdullah EKİNCİ, Arif ÖZYANKI, Hilmi DİNDAR

Killi zeminlerde Çok Kanallı Yüzey Dalgası Analizi Yöntemi ile eldeedilen kayma dalga hızı ile plastisite indisi ve standart penetrasyonsayısı korelasyonu

Temel zemin mekaniği parametreleri ile karmaşık zemin modeli parametrelerinin elde edilmesi mümkündür. Kayma dalgası hızınadayalı zemin profilini belirlemek için farklı jeofizik arama teknikleri kullanılmaktadır. ÇKYDA tekniği zemin parametrelerini eldeetmek için kullanılan jeofizik çalışma yöntemlerinden bir tanesidir. Yerine özgün olarak sığ yüzey altı topografya araştırmalarındahızlıca uygulanabilen doğaya tahribatsız ve çok hızlı değerlendirme imkânı sunan bu yöntem geoteknik çalışmalar için büyük biröneme sahiptir. Çalışma kapsamında farklı noktalarda gerçekleştirilen ÇKYDA tekniği ile elde edilen kayma dalgası hızları (Vs), yineaynı noktalarda yapılan sondajlardan elde edilen SPT-N ve örselenmiş zemin numuneleri üzerinde yapılan deneylerle bulunanplastisite indisi (PI) değerleri ile karşılaştırılmıştır. Gerçekleştirilen değerlendirmeler neticesinde kayma dalgası hızları ile plastisiteindisi ve SPT-N değerleri arasında bir anlamlı bir ilişki gözlenmiştir. Bu karşılaştırma sonucunda elde edilen bağıntı Plastisite indisiiçin %93’lük ve SPT-N değerleri için %74’lük bir benzerlik gösterdiği görülmüştür. Elde edilen korelasyon eğrileri göstermiştir kiplastik indisi ile kayma dalgası hızları arasında ters orantı varken, SPT-N değerleri arasında doğru orantı mevcuttur. Zemin mekaniğiile ilişkili her parametre birbiri ile bağlantılı olması gerektiği bilinmekle birlikte, her farklı deneyin birbirlerine göre sağladığıfarklılıklar vardır. Sonuç olarak plastisite indisi ve SPT-N gibi doğal zemin üzerinde yapılan deneyler kullanılarak hem yapısal hem dezemin modellerinde kullanımı değerli kayma dalgası hızları arazi çalışmaları öncesinde öngörülebilir. Çalışma kapsamında killizeminlerin plastisite indisi ile kayma dalgası hızı arasında gerçekleştirilen regresyon analizleri sonucunda yüksek determinasyonkatsayısına sahip olduğu ve bahse konu parametereler arasında güçlü mekaniksel bağ olduğu gözlemlenmiştir.

Correlation for Multichannel Analysis of Surface Waves determined shear wave velocity as a function of plasticity index and standard penetration test resistance for clay soils

It is possible to obtain advance soil parameters via basic characteristic tests on soil specimens. Shear wave velocity is an importantsoil parameter required for advance soil models and can be determined during the field investigation of such weak and problematicsoils. Various geophysical techniques have been utilized in past to determine the shear wave velocity. Among those techniquesMultichannel analysis of surface waves (MASW) method is the most widely used one. Named shallow depth ground investigationtechnique has a great importance in geotechnical applications. In this study, shear wave velocity measurements via MASW technique performed in various sides of North Cyprus have beencorrelated to the Standard penetration blow number (SPT-N) and plasticity index (PI) value obtained via undisturbed samples at samelocations. Evaluation of results have revealed that there is a good correlation between simple, easy and cheap to obtain soil mechanicparameters such as plasticity index and SPT-N number to more advance and expensive to obtain parameters such as shear wavevelocity via MASW. Regression factor of shear wave velocity verses plasticity index found to be as successful as 93% and Shearwave velocity verses SPT-N as 74%. It is also evidential that plasticity index and shear wave velocity has invers correlation whereSPT-N verses shear wave velocity is directly correlated. It is essential to know that most of soil parameters are correlated to each other with various ways and it is important to highlight thosedifferences in correlations. Therefore, it is evidential that a parameter which can be used in advance soil modelling, shear wavevelocity, can be obtained via simple, fast, and cheap experiments such as characterisation and standard penetration tests. It isevidential from the results that regression analysis of shear wave velocity verses plasticity index has high regression factor where suchrelationship shows strong mechanical link between those parameters.

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