The territory of Bulgaria is characterized by active tectonics, which had determined the formation of hilly and mountain relief. The geological structure is rather diverse and includes both rocks and dispersed soils. Under the effect of the naturally occurring processes thousands of landslides with different volume, mechanism and dynamics are displayed. The construction of various facilities, roads and buildings under these conditions is connected with the performance of excavations and embankments, changes in the groundwater level and dynamic impacts, leading often to slope instability, appearance of new landslides and activation of old existing landslides.

The stabilization of slopes and prevention of landslide appearance occupies an important place in both new construction and exploitation of the already built facilities. The present work gives examples of different methods for landslide stabilization and makes brief analysis of their effectiveness. The more often applied methods include various types of vertical and horizontal drainages, changes of slope inclination, strengthening with reinforced concrete piles, anchors, retention walls, gabions, reinforcement of buttress embankments. Special attention is paid to landslide monitoring as a substantial element for predicting their development and as initial information for selecting a suitable set of preventive and stabilizing measures.

The main conclusion based on the investigated cases is due to the multifactor character of the landslide process the maximum stabilizing effect is achieved when the applied measures are aimed at the factors having the highest weight impact on slope stability.