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GEOTEXTILE STRUCTURES USED FOR THE RECONSTRUCTION OF THE MOTORWAY MUNICH-SALZBURG

Within the reconstruction of the motorway BAB A8 Munich-Salzburg in the area of the lake "Chiemsee", different special geotextile constructions were used due to very poor underground soil conditions with very low bearing capacity. In the widening area of the road consolidation, surcharges were installed as a preliminary measure to reduce the later settlement and to equalize the consolidation situation of the underground of the old and the new part of the road. To increase the speed of consolidation, geotextile coated gravel columns were used as vertical drains. Reinforcement of the soil was an additional effect of this. For the reconstruction phase of a bridge, a bypass drift was necessary which was constructed with geotextile reinforced steep slopes. With a length of 300 m and a height of up to 5 m, it was one of the first reinforced slopes directly under heavy motorway traffic in Germany. Two different reinforcements were used (geogrid, composite). Lots of measuring equipment was installed. After finishing the construction of the new bridge, the traffic was removed from the reinforced steep slopes were ready for test loadings to look at the load/deformation behaviour of the slopes. Anchors were installed as an abutment and loadings up to 800 kPa on an area of 2.5 m x 2 m were possible. Failure mechanisms could not be observed, deformations were rather small. For the covering abstract see ITRD E109917.