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Monteput doo , Podgorica , Montenegro
The Ibarac tunnel was excavated as part of the Rožaje bypass project in Montenegro. Nearly half of the excavation was carried out in glaciofluvial sediments consisting of brown sandy clay with gravel and rock fragments. As the original design did not anticipate tunneling through such deposits, the subsequent adoption of overly optimistic geotechnical parameters led to several collapses during the construction phase. A major collapse occurred within a section containing a parking niche at km 0+473. Although the overburden at this location exceeded 100 m, deformations reached the surface, forming a vertical channel with a diameter of 26 m. This paper proposes a rehabilitation solution using a pre-grouting technique.
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