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Andezitlerdeki Akma Bantlarının Makaslama Dayanım Parametrelerinin Statik ve Dinamik Koşullar Altında Belirlenmesi

Tüneller, yeraltı kazıları kaya şevleri gibi jeoteknik projelere ait stabilite ve deformasyon analizleri, süreksizliklerin (eklemler, çatlaklar, tabakalanma düzlemleri vb.) davranışları hakkında güvenilir verilere ihtiyaç duymaktadır. Bu nedenle makaslama kutusu deneyleri, kaya mekaniği uygulamalarında yaygın bir şekilde kullanılmaktadır. Bu çalışmada, İzmir Körfezi kuzeyinde geniş alanlar kaplayan andezitlerdeki akma bantları üzerinde statik ve dinamik koşullarda makaslama kutusu deneyleri yapılmıştır. Makaslama deneyleri 400 x 200 mm dikdörtgen şekilli geniş yüzeyler üzerinde statik ve dinamik koşullarda yapılmıştır. Statik koşullarda yapılan deneylerde, zaman – yer değiştirme; zaman – gerilme; makaslama yer değiştirmesi – gerilme; makaslama yer değiştirmesi – normal yer değiştirme; makaslama yer değiştirmesi – makaslama gerilmesi; normal gerilme – makaslama gerilmesi ilişkileri elde edilerek doruk ve artık makaslama dayanımları, temel sürtünme açısı ve artık sürtünme açısı değerleri bulunarak sonuçlar yorumlanmıştır. Dinamik koşullarda yapılan deneylerde ise, makaslama yer değiştirmesi – zaman, makaslama gerilmesi – zaman, makaslama yer değiştirmesi – makaslama gerilmesi – zaman, makaslama gerilmesi – makaslama yer değiştirmesi, normal yer değiştirme – zaman ilişkileri elde edilmiş ve sonuçlar yorumlanmıştır. Andezitlerdeki akma bantlarında yapılan makaslama kutusu deneyleri sonucunda; akma bantlarının dayanım özellikleri daha gerçekçi olarak tanımlanacak, nümerik analiz programları ve nümerik simülasyonlar kullanılarak depremlere bağlı olarak andezitlerdeki yer altı ve yerüstü kaya yapılarının duraylılığını belirlemeye yönelik modellemelerde daha gerçekçi çözümler elde edilecektir.

Determination of the Shear Strength Parameters of Flow Band Structures in Andesites under Static and Dynamic Conditions

Stability and deformation analyses of geotechnical projects such as tunnels, underground excavations and rock slopes require reliable data about the behavior of discontinuities (joints, fractures, bedding planes and etc.). Therefore, shear box tests are widely used in rock mechanics applications. In this study, severalstatic and dynamic shear box tests were carried out both over flow bands of the andesites which cover a large area in the northern part of Izmir Bay. Shear box tests were conducted under both static and dynamic conditions on rectangular planes with a dimension of 400 x 200 mm. As a result of these tests, normal displacement-normal stress, shearing displacement-shearing stress and normal displacement-shear strength correlations were obtained. Also, peak and residual shear strength values, base friction angle and residual friction angle were found and the results were interpreted. Thus, the shear strength properties of the flow band structures can be given with more accuracy. Based on the new findings, more realistic solutions will be obtained in numerical analyses and simulation models aiming at determining the stability of underground excavations and engineering projects on the ground surface will be more reliable.

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