SPECIAL FOUNDATIONS. THEIR APPLICATION AND EVOLUTION IN THE MOTORWAY CONSTRUCTION AT THE BOIS DE BOULOGNE

THIS ARTICLE DESCRIBES THE SPECIAL ROAD WORKS IN PROGRESS FROM JANUARY 1969 TO MAY 1973, DURING THE CONSTRUCTION OF THE WESTERN RING ROAD IN PARIS AND ITS LINKING WITH THE A13 MOTORWAY, IN THE AUTEUIL-BOULOGNE REGION. THEY WERE REQUIRED BECAUSE OF THE GEOLOGY OF THE AREA WHICH NECESSITATED DEEP FOUNDATIONS AND BECAUSE OF THE EXISTENCE OF A SHALLOW ALLUVIAL-WATER TABLE. DETAILS ARE GIVEN OF THE SLURRY TRENCH WALLS BUILT IN THE AUTEUIL-PASSY COVERED TRENCH (FOUNDATION), IN THE PRINCES CAR PARK (RETAINING WALL, AND SUPPORT OF ONE OF THE UNDERGROUND RAILWAY ARCHES), AT THE AUTEUIL INTERCHANGE (PROTECTION AGAINST THE WATER TABLE), AT THE SEINE BRIDGE (BRIDGE ABUTMENTS AND SUPPORTS OF THE VIADUCT ON THE BANK), AND IN THE COVERED TRENCH OF THE A13 MOTORWAY (FOUNDATIONS BY MEANS OF PREFABRICATED WALLS).