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    Determination of the dam axis permeability for the design and the optimization of grout curtain: An example from Orhanlar dam (Kütahya-Pazarlar)
    (International University of Sarajevo, 2017) Canoğlu, Mustafa Can; Kurtuluş, Bedri
    Rural projects become an important issue considering the rapid increase of population in Turkey. Alongside the contribution to the national economy, dams serve as an environmental structure, which are utilized in flood prevention, sustainable energy, fighting with forest fire and recreation. However, dam construction must be well planned and projected to minimize the unexpected events such as water leakage. This study comprise the geotechnical studies and the design of the planned grout curtain in Orhanlar Dam (Kütahya/Pazarlar). In this context, field and laboratory studies was realized in Orhanlar Dam axis and reservoir area. Within the scope of field studies, engineering geology map was generated, a suitable axis location was specified for the dam and drilling and in-situ testing was realized. Within the field studies, the joint conditions of the geological units under the dam axis and its effect on permeability was observed. For the geotechnical purposes drilling works performed during the planning stage, 5 boreholes total 166 m was realized on dam axis, 1 borehole total 10 m was realized on cofferdam, 1 borehole total 10 m was realized on diversion tunnel and 1 borehole total 10 m was realized on spillway. To determine the permeability profile on dam axis and design the grout curtain, Lugeon tests in Dagardi ophioloitic melange units observed in dam axis, falling head permeability tests in alluviums observed in thalveg and slope debris observed in right abutment were performed. As a result of these studies geotechnical information about the permeability of Orhanlar Dam was collected and the grout curtain hole was designed.
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    Öğe
    Permeability of Savcibey Dam (Bilecik) axis location and design of grout curtain
    (General Directorate of Mineral Research and Exploration (MTA), 2017) Canoǧlu, Mustafa Can; Kurtuluş, Bedri
    This study comprise the design of the planned grout curtain in Savcibey Dam (Söǧüt/Bilecik) in order to provide impermeability along the dam axis. Within the context of field studies, engineering geology map was generated, ground investigation drilling was realized and permeability tests were performed. Within the field studies, the joint conditions of the geological units (Triassic aged Bozüyük Metamorphic schists) under the dam axis and its effect on permeability was observed considering the positions of the discontinuities with regard to the dam axis location. Orientation of discontinuities generally have strikes changing between N - S and NNE - SSW. 5 boreholes on dam axis, 2 boreholes on cofferdam, 3 boreholes on diversion tunnel and 2 boreholes on spillway total 245 m ground investigation borehole were drilled. In order to determine the permeability profile of dam axis and design the grout curtain, Lugeon tests in Bozüyük Metamorphic units observed in dam axis, falling head permeability tests in alluviums observed in thalveg and slope debris observed in right abutment were performed. Lugeon tests realized in Bozüyük Metamorphic units show that the unit is generally permeable and partly low permeable. Alluvium and slope debris are highly permeable. In addition, drilling works realized in dam axis shows that the augmentation of the weathering degree cause an increase of permeability in Triassic aged Bozüyük Metamorphic schists. As a result of these studies information about the permeability of Savcibey Dam was collected and the grout curtain hole was designed. Accordingly, it is predicted that approximately 40 m depth of grout curtain from the stripping excavation with the depth of 1.50 m would prevent the possible leakages.
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    Öğe
    SAVCIBEY GÖLETİ (BİLECİK) EKSEN YERİNİN GEÇİRİMLİLİĞİ VE ENJEKSİYON PERDESİNİN BOYUTLANDIRILMASI
    (2017) Canoğlu, Mustafa Can; Kurtuluş, Bedri
    Bu çalışma, Savcıbey Göleti (Söğüt/Bilecik) eksen yerinin geçirimsizliğini sağlamak amacıyla yapılması planlananenjeksiyon perdesinin boyutlandırılmasını kapsamaktadır. Arazi çalışmaları kapsamında mühendislik jeolojisi haritasıyapılmış, araştırma sondajları açılmış ve bu araştırma sondajlarında geçirimlilik deneyleri gerçekleştirilmiştir. Araziçalışmaları ile eksen yerindeki Triyas yaşlı Bozüyük Metamorfitleri’ne ait şistlerin içerdiği süreksizliklerin özelliklerive geçirimliliğe olan etkisi, süreksizliklerin eksen yerine göre konumları göz önüne alınarak gözlemsel olarak belirlenmiştir. Süreksizlik konumları genel olarak K-G ile KKD-GGB arasında değişen doğrultulara sahiptir. Baraj ekseninde 5adet, memba batardosu üzerinde 2 adet, çevirme tüneli güzergâhında 3 adet, dolusavak yerinde ise 2 adet olmak üzeretoplam 245 m derinliğinde araştırma sondajları açılmıştır. Eksen yerindeki kayaçların geçirimliliğinin belirlenebilmesive enjeksiyon perdesinin boyutlandırılabilmesi amacıyla, Bozüyük Metamorfitleri’ne ait birimlerde Lugeon deneyleri,talvegdeki alüvyonlarda ve sağ yamaçta yüzeylenen yamaç molozunda ise düşen seviyeli geçirimlilik deneyleri gerçekleştirilmiştir. Lugeon deneyleri sonucunda Bozüyük Metamorfitleri’nin genel olarak geçirimli ve yer yer az geçirimliözellikte olduğu belirlenmiştir. Alüvyon ve yamaç molozu ise çok geçirimlidir. Ayrıca, eksen yerinde gerçekleştirilensondaj çalışmaları, Triyas yaşlı Bozüyük Metamorfitlerinde ayrışma derecesinin artmasıyla geçirimliliğin de arttığınıgöstermiştir. Tüm çalışmaların sonucunda Savcıbey Göleti’nin geçirimliliği ile ilgili bilgiler toplanmış ve enjeksiyonperdesi boyutlandırılmıştır. Buna göre, 1.50 m’lik sıyırma kazısından itibaren ortalama 40 m derinliğinde oluşturulacakbir enjeksiyon perdesinin muhtemel kaçakları engelleyeceği öngörülmüştür.