Effect of thermal damage on brittleness and chemical properties of sandstone

Abstract

Mine fires may cause many ground collapses that threaten the safety of the underground coal mining applications due to the coal meassure rocks exposed to varying heat. This research focuses on investigating the changes in thermal damage and brittleness properties of sandstone from the Zonguldak Coal Basin at temperatures ranging from 25 to 600°C. In the determination of rock brittleness, five different approaches calculated depending on the strength parameters were considered. According to the findings of this study, statistical analysis (regression analysis) were revealed over 0.85 between rock thermal damage (Dt) and rock brittleness of sandstone. Moreover, new estimation models have also been developed that can predict the brittleness properties from the thermal damages of the thermally exposed sandstone. On the other hand the chemical composition of the rocks can be used to determine the thermal damage and thus the brittleness. In this context, a negative linear relationship was obtained between Dt and Al2O3, while a positive linear relationship was obtained between Na2O and SiO2.

Keywords

• Mine fires
• Temperature
• Brittleness
• Thermal damage
• Sandstone

Termal hasarın kumtaşının kırılganlık ve kimyasal özellikleri üzerindeki etkisi

Öz

Maden yangınları, değişen ısıya maruz kalan kömür çevre kayaçlarında birçok zemin çökmesine neden olabilmekte ve bu durum yeraltı kömür madenciliği uygulamalarının güvenliğini tehdit etmektedir. Bu araştırma, oda sıcaklığından 600°C'ye kadar değişen sıcaklıklarda Zonguldak Kömür Havzası'ndan elde edilen kumtaşının termal hasar ve kırılganlık özelliklerindeki değişiklikleri incelemeye odaklanmaktadır. Kayaç kırılganlığının belirlenmesinde, dayanım parametrelerine bağlı olarak hesaplanan beş farklı yaklaşım dikkate alınmıştır. Bu çalışmanın bulgularına dayanarak, istatistiksel analiz (regresyon analizi), kaya termal hasarı (Dt) ile kumtaşının kaya kırılganlığı arasında 0,85'in üzerinde bir ilişki olduğunu ortaya koymuştur. Ayrıca, termal olarak maruz kalan kumtaşının termal hasarlarından kırılganlık özelliklerini tahmin edebilen yeni tahmin modelleri de geliştirilmiştir. Öte yandan, kayaçların kimyasal bileşimlerinin termal hasarın ve dolayısıyla kırılganlığı belirlenmesinde kullanılabileceği belirlenmiştir. Bu bağlamda, Dt ile Al2O3 arasında negatif doğrusal bir ilişki elde edilirken, Na2O ile SiO2 arasında pozitif doğrusal bir ilişki elde edilmiştir.

Anahtar Kelimeler

• Maden yangınları
• Sıcaklık
• Kırılganlık
• Termal hasar
• Kumtaşı

Kaynakça

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