The construction of Arberi road is of the most impressive civil engineering projects in Albania, which connects Albania with North Macedonia and under construction throughout very difficult ground conditions with transverse topographical changes are abrupt due to the nature of the terrain. The first part of the Murrizi tunnel is located in a sliding area which consists of very weak as well as unstable rocks, and subject to high pore water pressure condition. In order to overcome the problem, numerous in situ tests/observations, bore holes and site/lab tests are conducted to describe the failure plane as well as actual ground properties.

In this paper it is aimed to present the results of the terrain observations, geological/geotechnical surveys, laboratory and in situ tests including deep inclinometer measurements down to 100m, the numerical analyses, solution alternatives, and the selection of the solution. The sliding surface and which scale of a danger exists in the sliding phenomena affecting the stability of the Murrizi tunnel is also described within the content of this study. Furthermore, the slope supporting system is selected as a result of limit state as well as finite element analyses based on the detailed ground data and information obtained. Thus, the slope stability problem which is of key importance for an important engineering structure and located in a landslide area is investigated comprehensively. The results of this investigation could be helpful to the engineers focusing on such landslide problems.

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