Stress concentration analysis between two neighboring circular holes under internal pressure of a non-explosive expansion material

Year 2009, Volume: 30 Issue: 3, 259 - 270, 01.04.2009

Shobeir Arshadnejad Kamran Goshtasbı Jamshid Aghazadeh

Abstract

Keywords

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Patlamayan-kabaran malzemenin içsel basıncı altındaki komşu dairesel iki delik arasındaki gerilme konsantrasyonunun analizi

Abstract

Komşu konumlu iki dairesel delik arasındaki gerilme konsantrasyonunun tayini ve kırık davranışının tahmini için kaya ortamında gerilme analizi yapılması gereklidir. Granit gibi sert kaya ortamlarındaki komşu konumlu dairesel delikler Patlamayan-Kabaran Malzeme (PKB)’nin basıncıyla yüklendiklerinde, kayanın kırılmasına neden olan gerilme konsantrasyonları meydana gelir. Bu çalışmada, PKB’nin neden olduğu içsel basınç altındaki komşu konumlu iki dairesel delik arasındaki gerilme konsantrasyonunun araştırılması için Phase adlı bilgisayar programı kullanılarak Sonlu Elemanlar (SE) analizi yapılmış olup, bu analizlerde farklı delik çapları ve uzaklıkları, kaya özellikleri ve PKB basınçları analiz edilmiştir. Sayısal çözümlemelerden ve istatistiksel analizlerden elde edilen veri iki modelin geliştirilmesi için kullanılmıştır. Daha sonra bu modeller SE ve polinomial regresyon analizleriyle modifiye edilmişlerdir. Geliştirilen istatistiksel modeler SE analiziyle çok iyi bir uyum göstermiştir. Eşitlikler, sadece elastik durumda deliklerin merkezinden geçen hattın üzeride yer alan noktalar için geçerlidir. Bu nedenle geliştirilen modeler, PKB’den kaynaklanan basınçla içsel olarak yüklenmiş ve sert kayada kazılmış komşu konumlu dairesel delikler çeveresindeki gerilme konsantrasyonu faktörlerinin ve gerilme dağılımının belirlenmesi için güvenilirlikle kullanılabilirler

Keywords

Sonlu elemanlar yöntemi, patlatmasız taş ocağı işletmeciliği, istatistiksel model, gerilme konsantrasyonu

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