Abstract
Alternative transport systems are not competitors, but complementary toone another. In this respect, one should expect that engineering projects concerningtransport infrastructure in Turkey are planned with long-term needs in mind and ascomplementing ones. However, in pratice, it is rather difficult to implement projectswhich are scientifically up to date, rational and reasonably priced where roadconstructions are tendered with regards to the lenght of the work. Sason HighwayProject is no exception. This highway is a particularly important one, since theexisting route (S2) is built with low standarts and is prone to landslides whereas, theproposed alternative (S1) will not only raise the standarts of transport along thisroute, but also will enable a northbound connection for the Batman-Diyarbakirhighway to the Mus-Elazig highway.Thus, to create a modern highway project, measures are taken to make surea reliable geotechnical design is implemented. Masses of landslides are pinpointedon 1/25000 scaled topographical maps. All the geotecnical units, landslides andstructures are mapped during the fieldwork. Samples are taken for lab-research fromvariety of units by boring into these sites. Geological units have been evaluated onthe basis of WDC (Water-Discontiniuty-Clay) combination. The dimensions of theselandslides, the units in which they take place and possible effects on route S1 havebeen examined.The highway, the axis of which mostly sat on the sediments of AydinlikRiver, whould pass through flish sediments only at two points. The geotechnicalparameters for the aluvial material and the flish are determined via literatureresearch and lab-work. The findings are as follows;Internal friction angle (Ï) of the unit, which is mostly GW-GP according toUnified Soil Classificaiton is found Ï = 370, cohesion, in accordance with a certainamount of clay ingrediance is c = 1 kPa, the elasticity modulus in accordance withdense gravel property is 120000 kPa, dry unit weight is γkmax =21 kN/m3. Finally,according to the results of the reflexive analysis made on landslides, providing thatthe safe margins are not exceeded, that internal friction angle and the cohesion arefound as Ï = 250 and c = 10 kPa respectively.Key words: Geotechnical parameters, Landslides, Route, Sason
