Determination of geotechnical properties of Devlet Bahçeli Bridge (Adana) route

In this thesis, the study area known as the Devlet Bahçeli bridge route in Adana city which is connected with Çukurova and Sarıçam is located in front of the Seyhan Dam body. 800 meters of the bridge will be reinforced concrete and 825 meters of the bridge will be steel. The total length of the bridge with its connecting roads will be 2450 meters. For this purpose, geological and geophysical studies have been performed to the safe and economical design of bridge foundations. The field studies and laboratory experiments are carried out inclusively to determine the underground model, soil classification, and geotechnical design parameters. An integrated approach is applied in this study to interpret with the geophysical data and drillings. A total of 29 core and non-core drilling, composed of 3 in the water and 26 in the land, are performed and laboratory experiments are governed on the cores. The study area corresponds to a non-cohesion unit consisting of sand and gravel, cohesive clay and conglomerate. Standard Penetration Test (SPT) is applied to obtain the tightness-rigidity of the groundwork and the Pressiometer test is performed in the conglomerate dominated area. Seismic refraction (3 profiles) and Vertical Electric Drilling (3 profiles) methods are used as geophysical methods. Using the seismic refraction method, density (), maximum shear modulus (Gmax), young modulus (Ed), Poisson ratio (), bulk modulus (k), seismic velocity ratio (Vp/Vs) and Vs30 (m/s) value are calculated to dynamic-elastic properties of the study area according to Vp ve Vs velocities. The conductivity and thickness values of the layers are derived from the resistivity method and 2-D sections are plotted in the underground structures. Also, the probabilistic earthquake risk analysis is carried out in this study area due to the high-risk levels under the engineering structures. The probability of an earthquake of 6.5 magnitude within 10 years has been identified to be 35.4%. As a result of this thesis, extensive field surveys and laboratory experiments are revealed along with the Devlet Bahçeli bridge. Additionally, the underground model, soil classification and geotechnical design parameters throughout the bridge route are determined by means of geological and geophysical surveys.