Engineering Geology Study For Planning And Construction Of Tirana-Elbasani Motorway

Abstract

In this paper are treated the results of the engineering geological study done for motorway construction purpose of Tirana-Elbasani cities in feasibility and project idea phases. A detailed engineering geological mapping was carried out by assessing of geo-factors for the needs of purposeful utilization of territory by means of land-use planning. It focuses on five geo-factors as lithology, geomorphology, hydrogeology, geodynamics phenomena and geotechnical characteristics, which assess the geological environment in terms of potential implementation of particular engineering project including and taking into account its anticipated interaction with the planned engineering works in the studied area. The evaluation of road's alternatives is done by geo-factors analysis in form of the "Geo- Risk" for each geo-factor unit within the projected zone. So, the studied zone was divided in forth level are first level (no risk)-no engineering measurements, second level (low risk) - no problems, feasible to build, third level (medium risk)-with increased effort, feasible to build, but needs investments, forth level (high risk)-with very high additional effort for construction, which need high investments. The geo-risk level of each unit has been taken into account for the estimation of the designed alternatives/routes and at least as one criterion for the determination of candidate routes/planning cases. So, the total geo-risk level's calculation has been compared with results of the other variants/routes. From this analyze the interest zone in the studied area results to be the eastern corridor-Tirana-Mullet-Ibe-Kusha-Bradashesh-Elbasan. It is represented by flat-hilly terrain zone. It's constructed from geological structures (synclines, anticlines and monocline), which are built by molasses and premolasses rocks. In several places these rocks are affected by tectonics and neo-tectonics phenomena. Mostly of hills slopes are occupied by quaternary deposits-soils with possibilities of landslide development in any case of the disbalance of the slopes from manmade works.In this paper are treated the results of the engineering geological study done for motorway construction purpose of Tirana-Elbasani cities in feasibility and project idea phases. A detailed engineering geological mapping was carried out by assessing of geo-factors for the needs of purposeful utilization of territory by means of land-use planning. It focuses on five geo-factors as lithology, geomorphology, hydrogeology, geodynamics phenomena and geotechnical characteristics, which assess the geological environment in terms of potential implementation of particular engineering project including and taking into account its anticipated interaction with the planned engineering works in the studied area. The evaluation of road's alternatives is done by geo-factors analysis in form of the "Geo- Risk" for each geo-factor unit within the projected zone. So, the studied zone was divided in forth level are first level (no risk)-no engineering measurements, second level (low risk) - no problems, feasible to build, third level (medium risk)-with increased effort, feasible to build, but needs investments, forth level (high risk)-with very high additional effort for construction, which need high investments. The geo-risk level of each unit has been taken into account for the estimation of the designed alternatives/routes and at least as one criterion for the determination of candidate routes/planning cases. So, the total geo-risk level's calculation has been compared with results of the other variants/routes. From this analyze the interest zone in the studied area results to be the eastern corridor-Tirana-Mullet-Ibe-Kusha-Bradashesh-Elbasan. It is represented by flat-hilly terrain zone. It's constructed from geological structures (synclines, anticlines and monocline), which are built by molasses and premolasses rocks. In several places these rocks are affected by tectonics and neo-tectonics phenomena. Mostly of hills slopes are occupied by quaternary deposits-soils with possibilities of landslide development in any case of the disbalance of the slopes from manmade works.