TMMOB
Changes in Settlement Troughs Induced by Subway Tunnel Excavations in Weak Geological Environments in Istanbul
Twin Tunnel
Istanbul Metro
Geotechnical Monitoring
Settlement Trough
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Topal, C. , Mahmutoglu, Y. `İstanbulda Zayıf Jeolojik Ortamlarda Metro Tüneli Kazılarının Neden Olduğu Oturma Teknesindeki Değişimler` . Jeoloji Mühendisliği Dergisi 46 (2022 ): 1-16
Abstract: Due to increasing urban populations, many modern cities attempt to solve problems associated with theincreasing demand for public transportation by constructing these systems underground. To create new metro lines,multiple underground excavations must be carried out in several locations; these are often close to each otherin shallow and weak geological environments due to geometric limitations as well as access-related restrictions.Settlement troughs can occur as a result of these excavations, potentially causing serious damage to the structureswithin the settling area. This study evaluated the data collected by monitoring the extent of surface deformationduring the excavation process in four different locations on the Kirazlı-Olimpiyat-Başakşehir Metro Line as wellas two different locations on the Ataköy-İkitelli Metro Line; all of these sites were located on the European side ofIstanbul. The geometry of the surface settlement troughs that formed due to these tunnel excavations was examined;a total of 12 sections were investigated in this study. An analysis of the monitoring data reveals that, in similar geological environments, successively excavated tunnels with the same geometry and tunnelling methods can disturbthe geological environment through which the tunnels are constructed; in particular, if the second tunnel passesthrough the same section, this results in the formation of an increasing and asynchronous surface settlement trough.This result indicates that the material parameter (K), which affects the size of the settlement trough formed inscenarios with twin subway tunnels with close axes and that are excavated at shallow depths, has different valuesat the wings of the settlement trough that forms after the tunnels have been excavated, and that this change in Kinfluences the shape of the surface settlement trough. This study suggests that predicting any changes in K, whichis dependent on the characteristics of the surrounding rock, is important in order to mitigate any potential risks,especially at the design stage of any project that requires the excavation of multiple tunnels at shallow depths and inweak geological environments.
Investigation of Çevreli Village (Mersin) Landslide Affecting the Energy Transmission Line and Evaluation of Stabilization Methods
Back-Analysis
Landslide
Stabilization Suggestions
Claystone
Tarsus
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Orhan, A. Enerji Nakil Hattını Etkileyen Çevreli Köyü (Mersin) Heyelanının İncelenmesi ve İyileştirme Yöntemlerinin Değerlendirilmesi`. Jeoloji Mühendisliği Dergisi 46 (2022 ): 17-40
Abstract: The aim of the study is to examine the landslide affecting the electricity pole of Kadıncık II HEPP located inÇevreli Village of Tarsus District of Mersin Province ,and to perform a comparative analysis of different stabilizationmethods. While the Güvenç formation with claystone, claystone-siltstone ,and marl intercalations is observed in thestudy area, mudstone-claystone intercalated conglomerate, pebbly sandstone ,and coarse-grained sandstone levelsare observed in the Kuzgun formation at the upper elevations. The instability problem in the mentioned location hasthe potential to expand in a large landslide that encompasses the energy transmission line over time. Within thescope of this study, the existing landslide was examined, ,and its failure mechanism was revealed, ,and alternativestabilization methods were developed to prevent possible instabilities that would affect the electricity pole. In thiscontext, drilling studies for engineering geology were carried out in the vicinity of the electricity pole in the studyarea ,and disturbed ,and undisturbed samples were taken for laboratory analysis. On the other hand, shear strengthparameters of the failed material were determined by means of back-analyses. Thus, the current situation ,and the performance of the stabilization suggestions under saturated ,and/ dynamic conditions were evaluated. In order toprevent possible failures, alternatives of backfill ,and bored pile application were investigated by limit equilibriumanalysis. As a result of the analyses, it has been revealed that the stabilization methods evaluated can providestability in different conditions ,and that the high-cost electricity pole # 2 will not be at risk.
Shallow Crustal Structure of Lake Van and Its Surroundings with WGM2012 Bouguer Gravity Data
Total Horizontal Derivative
Tilt Angle
Van Lake
First Vertical Derivative
Structural Discontinuity
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The Potential of Badlands in Turkey as Geosites
Anatolia
Geoheritage
Geosite
Geotourism
Badlands
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Güney, Y. (2022). Türkiyedeki Kırgıbayırların Jeosit Potansiyeli . Jeoloji Mühendisliği Dergisi , 46 (1) , 51-79 . Retrieved from https://dergipark.org.tr/tr/pub/jmd/issue/70692/1138976
Güney, Y. `Türkiyedeki Kırgıbayırların Jeosit Potansiyeli` . Jeoloji Mühendisliği Dergisi 46 (2022 ): 51-79
Abstract: Badlands are areas that cannot be used for agricultural and animal husbandry purposes. It is even impossibleto walk on some parts of them. However, they can be used for tourism and educational purposes. In the world,there are badlands used for tourism and educational purposes and visited by thousands of people every year. Itis also possible to see badlands, which cover a large area, almost in any region of Turkey. Turkey has badlandsthat can compete with other badlands in the world in terms of geosite potential. Indeed, certain badlands suchas Rhododendron Ridge, Küpyar Badland, Nallıhan Badland, Devil City Badland, Rainbow Hills (Erzurum) andRainbow Hills (Iğdır) have succeeded in attracting peoples attention with their interesting features. However, noholistic assessment has been carried out regarding the geosite potential of the badlands in Turkey. The main purposeof this research is to determine the educational and touristic value of certain badlands in Turkey as a geosite and tocompare these areas with their examples in the world. Accordingly, quantitative geosite assessment methods wereused in the research. The results of the assessment revealed that Nallıhan Badland, which is one of the badlandssubjected to assessment in the research, is the badland that has the highest geosite potential of Turkey with its main (educational and scientific) and additional (touristic and functional) values. Also, this area has high geotouristicvalue among other examples in the world. It was concluded that Turkey, which has important badlands in terms ofgeosite potential, does not evaluate these badlands for tourism and especially educational purposes.