Ferdi CİHANGİR, Bayram ERÇIKDI, Alp TURAN, Ayhan KESİMAL, EREN KÖMÜRLÜ

Çimentolu Macun Dolgu Malzemelerinin Makaslama Dayanımı Üzerine Deneysel Bir Çalışma

Bu çalışmada, çimento miktarı ve kür süresinin madencilikte kullanılan çimentolu macun dolgu malzemelerinin kohezyon ve içsel sürtünme açısı değerleri üzerindeki etkileri bir dizi deneysel çalışma ile incelenmiştir. Macun dolgu malzemelerinin yenilme özelliklerinin belirlenmesi için makaslama ve tek eksenli sıkışma dayanımı testleri gerçekleştirilmiştir. Elde edilen sonuçlara göre, Mohr- Coulomb yenilme ölçütünün çimentolu macun dolgu malzemeleri için kullanımına yönelik yeni bir katsayının kullanımı önerilmiştir. Çalışmanın önemli çıktılarından bir diğeri olarak, kür süresinin artışı neticesinde dayanım değerlerindeki iyileşmenin içsel sürtünme açısı nedeni ile değil, baskın olarak kohezyon değerlerindeki artıştan kaynaklandığı belirlenmiştir. Çimento miktarındaki artış sebebi ile hem içsel sürtünme açısı hem de kohezyon değerlerinde artış olduğu görülmüştür. Ayrıca, sülfat atak kaynaklı dayanım değerlerindeki azalmanın çimento miktarındaki artış neticesinde gecikerek daha uzun kür sürelerinde yaşandığı belirlenmiştir.

An Experimental Study on Shear Strength of Cemented Paste Backfill Materials

Change in the mechanical parameters of cohesion and internal frictionangle with variations in cement content and curing time of cemented paste backfill(CPB) materials was investigated carrying out a series of experimental study. Inthis scope, shear strength and uniaxial compressive strength (UCS) tests wereperformed to find out the failure properties of CPB samples. According to theresults obtained from this study, a new factor is suggested to use in the Mohr-Coulomb failure criterion to better fit the envelope for CPB materials. As animportant issue from this study, strength values of curing CPB specimens werefound to dominantly increase because of the improvement in cohesion valuesinstead of internal friction angle. With an increase in cement content, strengthvalues were measured to increase because of the improvement in both internalfriction angle and cohesion parameters. Additionally, start of decrease in strengthvalues due to the sulphate attack was found be postponded as another advantageof the increase in cement content.

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