Ceryan, Nurcihan; Kesimal, Ayhan; Aydın, Ali

Doğu Karadeniz Bölgesinin en büyük çimento hammadde ocağı olan Taşönü Kireçtaşı Ocağında (Araklı-Trabzon) 2005-2006 tarihleri arasında üç ayrı düzlemsel yenilme gelişmiştir. Değişik fasiyeslerdeki kireçtaşlarından oluşan Kireçhane formasyonunda açılmış olan ocakta gelişen bu heyelanlar sonucunda malzeme alımı büyük miktarda azalmıştır. Heyelanların kayma düzlemleri kalınlığı 15-110 cm arasında değişen killi seviyelerdir. Bu nedenle söz konusu killerin jeomekanik ve jeofizik özellikleri incelenmiştir. Killi seviyelerden alınan örnekler yüksek plastisiteli kil (CH) grubuna girmektedir. Bu örneklerdeki kil minerallerinin yaklaşık % 85-90'ı montmorillonit ve % 10-15'i ise illitdir. Bu alandaki kil çeşitliliğini ortaya koymada yararlanılan hacim manyetik süseptibilite ölçüleri 129-163x10-6 cgs aralığında değişmektedir. Bu değerler kil içindeki ağır metal kirlilik oranları ile irdelenmiş ve özellikle demir oksit (% 3.6-6.8) oranlarının değişimine bağlı olduğu sonucuna varılmıştır. Bu çalışmada, killi seviyeler ve dolgu malzemesi için elde edilen indeks ve makaslama dayanım değerleri ocaktaki açılacak kazı şevlerinin duraylılığının araştırılmasında kullanılabilir.

Ceryan, Nurcihan; Kesimal, Ayhan; Aydin, Ali

Tasonu limestone quarry located south of Arakli in Trabzon is the largest cement raw materials field in the Eastern Black Sea region. The quarry is run in the Kirechane Formation composed of limestone with various facies. However, it has been encountered three separate planar failures occurred between 2005 and 2006. Due to the failures, the amount of raw material production from the quarry has been gradually decreased. These failures occurred on clayey layers varying between 15 and 110 centimeter thicknesses. Therefore, the relevant clayey layers were examined in terms of geochmechanical and geophysical properties. The samples collected from the clayey layers are classified as high plasticity clay (CH) in accordance with the Unified Soil Classification System. Clay samples consist of 85 to 90 % montmorillonite and 10 to 15 % illite. The measurement of volumetric magnetic susceptibility used in the diversity of clay varies in the range 129-163x10(-6) cgs. These values have been analyzed with respect to the heavy metal pollution ratio of the clay and especially iron oxide depending on 3.6 to 6.8 % rates was the result. In this study, index and shearing strength values obtained from clayey level and filling material may be use for the investigation of the stability of quarry slopes during excavation.

Ceryan, Nurcihan; Ceryan, Sener

Large-scale instability phenomena frequently occur in slopes in such geologically complex areas as Dogankent in NE Turkey. This study presents an application of the interaction matrices (IM) methodology, as a semi-qualitative method sensitive to large-scale slope instability. For both rock and soil slopes, the main interactive factors were distance from faults, degree of weathering and slope angle. Using IM, a slope failure susceptibility map was created for the Dogankent area and checked again field evidence. The results indicated that IM could be a useful method for slope stability assessment.

Ceryan, Sener; Tudes, S.; Ceryan, N.

The description and classification of the rocks provide important information for geotechnical modeling in order to predict their engineering behaviors. One of the most imperative parameters influencing the engineering behaviors of the rocks is the degree of weathering. Therefore, it is evident that a realistic weathering classification is necessary mostly for establishing the geotechnical models in the engineering geology studies. For this reason, development of a qualitative weathering classification is the main purpose of the present study. The Weathering State Parameter has been first created by describing the chemical and physical changes separately owing to weathering by employing the ultrasonic wave velocity in the rock material. Then a quantitative weathering index was introduced by combining the weathering condition and the slake-durability known as the indicator of the rock/soil ratio in the rock material. Finally, this index obtained was applied on the prediction of the engineering properties of the Harsit granitic rocks (Giresun, NE Turkey). As a consequence of this study, it has been determined that the engineering properties of the samples and the numerical index proposed could be predicted. In addition, the use and the limitations of the index introduced herein were discussed.

Ceryan, Sener; Tudes, Sule; Ceryan, Nurcihan

Weathering and hydrothermal alteration of the granitic rocks in the Eastern Black Sea Region (NE Turkey) are important phenomena affecting the engineering projects in the region. The study investigated the probable paths of rock-forming mineral transformations due to weathering in the Harsit granitoid rocks, the changes of the major oxides as a consequence of weathering and the effects of weathering on the engineering properties. To identify the changes in the major oxides, the volume concentrations were considered in relation to the dry density. Chemical leaching during weathering was shown to be significant in changing the minerals. It was concluded that the engineering properties of the weathered granitic rocks can be most reliably predicted by P-wave velocity.