Geotechnical investigation of additional construction area of Denizli Organize Industry Region

H Kumsar, M Ozkul, S Yagiz

Research output: Contribution to conferenceAbstractpeer-review


In this study, Eastern side of Organized Province Directory, which belongs to Organize Directory, is investigated according to the construction regulation of the City to open the construction. The area that is 762,470 m2 was evaluated from the scope of geology and geotechnics. In extensional province of western Anatolia, Denizli Graben Basin takes place eastern side of Büyük Menderes and Gediz grabens, where two grabens are intersect. From North and south, Denizli Graben has bounded with normal faults. In general, NW-trended graben includes Neogene and Quarternary aged sediments. Mid and Upper Miocene aged Neogene sediments begin with alluvial fan at the bottom and continue with fluvial, lacustrine, fan delta and alluvial fan sediment which is on the top of the formation. Quaternary sediments take place with discordance on the Neogene sediments. In general Quaternary sediments composed of travertine, fluvial sediment and alluvium. In the study area, Quaternary travertine and decomposed travertine units crop out. Travertine unit has a color that changes from dark brown through yellowish beige in the investigated area where grass is generally weak and slope angle is low. According to the data of drillings, travertine units, which of thickness are changing from 1-10 meter, have horizontally transition with decomposed travertine. Travertine has porous and decomposed texture that can be seen from place to place due to affect of groundwater and atmospheric condition. Decomposed travertine includes sand, clay, silty that layers behaves like soil. In the study area, by considering geological investigation, 8 drillings were opened. Along each drill hole, where the soil material was intersected, SPT test was performed for every 1.5 meter and also disturbed soil samples were taken from the same depth. Laboratory tests were performed on the soil samples. Additionally, core samples have been taken to identify the soil, and core sample of travertine have been taken from available depths to perform point load index test in the laboratory. Groundwater level was measured for each opened drill hole. Along the depth of drillings, water samples were taken where the groundwater was intersected and dissolved sulfate concentration in the groundwater was analyzed to determine sulfate concentration in groundwater effect on the concrete. In the investigation area 14 trial pits, whose depths vary between 0.5m and 3.5m depending on the thickness of travertine unit, were opened. Physical and mechanical tests were performed on the disturbed and undisturbed soil samples whose were taken from the trial pits. In the investigated area, on the 6 different directions, seismic refraction measurements were taken by means of an engineering seismograph with 12 channels, and shear wave velocities of rock and soil units and their amplification values were determined. In the study area, values of shear wave velocity change between 765 cm/s2 and 190 cm/s2, soil amplification values vary between 1.26 and 2.92, safety factor against liquefaction changes between 0.537 and 1.5, dissolved sulphate amount within groundwater is between 742 mg/lt and 1700 mg/lt. By considering the probability of earthquake occurrence and soil/rock properties of the region, it is concluded that high soil liquefaction during a possible strong earthquake, low values of shear wave velocity, high soil amplification values, and high values of solved sulphate amount within groundwater should be paid attention during planning and construction of buildings in the study area.
Original languageEnglish
Number of pages1
Publication statusPublished - 2005
Event58th of Geological Congress of Turkey - Ankara, Ankara, Turkey
Duration: Apr 11 2005Apr 15 2005


Conference58th of Geological Congress of Turkey
Internet address


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