Bu öğeden alıntı yapmak, öğeye bağlanmak için bu tanımlayıcıyı kullanınız: http://acikerisim.ktu.edu.tr/jspui/handle/123456789/4762
Başlık: Analysis of the rock fatigue in tunnels by finite element method
Diğer Başlıklar: Tünellerde kaya yorulmasının sonlu elemanlar yöntemi kullanılarak
Yazarlar: Romero VasQuez, Manuel Diego
Anahtar kelimeler: Fatigue, Cyclic loading, Tunneling, New Austrian Tunnelling Method (NATM), PLAXIS 3D, Finite Element Method (FEM).;Yorulma, tekrarlı Yükleme, Tünelcilik, Yeni Avusturya Tünelcilik Yöntemi (NATM), PLXIS 3D, Sonlu Elemanlar Yöntemi
Yayın Tarihi: Ağu-2021
Yayıncı: Karadeniz Teknik Üniversitesi / Fen Bilimleri Enstitüsü
Özet: This thesis investigates the fatigue effect caused by cyclic loading on the deformation development around the underground openings. Employing PLAXIS 3D FEM package for the numerical modelling of a hypothetical tunnel opened by the NATM in Bayburt Tuff for static and cyclic loading conditions to analyze stresses and deformation developments. The investigation is divided into two stages: 1) physico-mechanical characterization of rock properties and performance of static and cyclic loading tests, and 2) numerical analysis applied to static and cyclic loading cases. PLAXIS 3D simulated four hypothetical NATM tunnels considering the Hoek-Brown failure criterion; being three of them based only on frequency variation (0.2 Hz, 0.6 Hz, and 1.0 Hz) while keeping the number of cycles (500) and load amplitude (30-50% from UCS) constant. Concluding as follow: i) the frequency directly influences the strength and elasticity values of the Bayburt tuff; in other words, the fatigue effects on rock specimen will be significant at lower frequencies. ii) |umax| (0.2 Hz) < |umax| (0.6 Hz) < |umax| (1.0 Hz) < |umax| (static), being |umax| the maximum total displacement. iii) tuff responds with an inverse relationship between principal stresses and frequency. iv) the fatigue effect influence appears through proportionality between frequency and safety factor (SF) values.
URI: http://acikerisim.ktu.edu.tr/jspui/handle/123456789/4762
Koleksiyonlarda Görünür:Maden Mühendisliği

Bu öğenin dosyaları:
Dosya Açıklama BoyutBiçim 
690310.pdf6.66 MBAdobe PDFKüçük resim
Göster/Aç


DSpace'deki bütün öğeler, aksi belirtilmedikçe, tüm hakları saklı tutulmak şartıyla telif hakkı ile korunmaktadır.