Jeoloji Mühendisliği Dergisi

ABSTRACT: Computer-aided mapping technologies and developments used in improvement of these methods have led to the production of higher performing landslide susceptibility maps. In this study, a thorough review of the literature about the production of landslide susceptibility maps by using AHP (Analytic Hierarchy Process) was made and, also, landslide susceptibility evaluation of Sinop and its surroundings was analyzed by AHP. In the evaluation of landslide susceptibility factors such as aspect, lithology, land use, curvature, slope, elevation and proximity to the main road, river and structural elements are considered to be controlling factors in the landslide process. These factors are turned in to grid maps according to their weighted values and by handling the values in comparison matrices in different manners, and variety of landslide susceptibility maps produced. Analysis of results showed that main controlling factors of landslides are the proximity to main road, aspect and lithology. As a result, in terms of landslide susceptibility, very low landslide susceptibility is determined in the 10.77%, low landslide susceptibility determined in the 10.59%, moderate landslide susceptibility is determined in the 52.64%, high landslide susceptibility determined in the 25.66%, very high landslide susceptibility determined in the 0.34%, of Sinop and its proximity area. This study reveal that AHP, which has been used increasingly in the last years, provides high performance in the study area.

ABTRACT: Gypsum precipitation related heaving generates important problems in engineering studies conductedin sulphate rich clay rocks. Formation of gypsum is generally related to the relaxation of previouslyexisting tectonic structures due to stress relief or are related to the microcracks formed by the effect ofcircumferential stresses. Depending on the brittle failure principals, deformation zones are generated inunderground rock structures which are excavated in sulphate rich clay rocks due to the stresses exceedingthe crack initiation stress level. It is suggested that these microcracks in deformation zones are preferentialpathways for gypsum precipitation. In this study, to introduce the failure mechanisms of sulphate rich clayrocks, unconfined and confined compressive strength tests, acoustic emission tests and high resolutionstrain measurements were conducted including microstructural and mineralogical analysis. The samplesused in the study were obtained from Gipskeuper formation of Triassic age from Belchen tunnelslocated in the northern parts of Switzerland. The unit is typically composed of distinct clay layers andstiff anhydrite veins and/or nodules. During the studies, it is concluded that the failure processes in lowdeviatoric stresses are controlled by the clay matrix where the microcracks are initiated. Besides, withincreasing deviatoric stresses or strain the propagating microcracks are hindered by stiff heterogeneousstructures. Furthermore microcracks propagates along the boundary between the clay matrix and the stiffheterogeneous structure or penetrates the stiff heterogeneous structures (anhydrite veins). By evaluatingthe data obtained for larger scale, it is suggested that the stiff heterogeneous structures like anhydriteveins can limit crack propagation and prevent disintegration of rock mass structure. In this respect, eventhe rock mass is terminated after excessing the crack initiation stress level, the heterogeneous structurehinders sudden failure of the rock mass

ABSTRACT: Biogeochemical methods have been widely used for prospects in the recent years. This study aimsto determine biogeochemical anomalities in Platanus orientalis and Phragmites australis plant speciesgrowing the Mezitli Stream. Li, B, Al, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, As, Se, Rb, Sr, Mo, Cd, Sn, Cs, Baand Pb element content of leaves and twigs of P. orientalis and P.australis, soil and stream water samplestaken from 8 stations in Mezitli (Mersin) area were determined with inductively coupled plasma - massspectrometry (ICP-MS). The result of the statistical analyses show that P. orientalis plant species(ontwigs) can also be used as an indicator plant for B(n = 10, r = 0,76, % 99 reliability, P < 0,01), Cr (n =12, r = -0,67, % 95 reliability, P < 0,05), Sr (n = 9, r = 0,72, %95 99 reliability, P < 0,05) and Pb (n =11, r = 0,63, % 95 reliability, P < 0,05) for biogeochemical prospecting. At the same time; P. australisplant species (on twigs) can be also used as an indicator plant for Cu (n = 11, r = -0,66, % 95 reliability,P < 0,05), Cr (n = 11, r = 0,64, % 95 reliability, P < 0,05) and Li (n = 10, r = 0,77, % 99 reliability, P <0,01) for biogeochemical prospecting. Also the inter-element relationship between the P.orientalis and P.australis plant species which were determined as indicator plants and soil were investigated for Cr, B, Sr,Pb, Cu, Li elements