1887

oa Civil Engineer in South Africa - Stabilization with rock anchors of two cuttings on National Route N13 : technical paper

 

Abstract

During the construction of a section of National Route N13 (Johannesburg Southern Bypass) two large cuttings were excavated. The first, in andesite lava, was adjacent to a Rand Water Board pipeline and the second, in quartzites, adjoined private dwellings. The cuttings were restrained with stressed anchors and unstressed dowels and the exposed faces were protected by concrete panels. The geotechnical design of the lateral support in the andesite was problematic, owing to the unpredictable variations in rock weathering. By contrast, the quartzite cutting was uniformly weathered, with consistent patterns of jointing, and design problems were concerned mainly with the overlying transported soil.

Die konstruksie van 'n gedeelte van Nasionale Roete N13 (Johannesburgse Suidelike Verbypad) het twee groot deurgrawings ingesluit. Die eerste, in andesietlawa, is aangrensend aan 'n Randwaterraad-pyplyn and die tweede, in kwartsiet, grens aan privaatwonings. Die deurgrawings is verstewig met gespande ankers en ongespande penne en die blootgestelde oppervlakte is beskerm met betonpanele. Die geotegniese ontwerp van die laterale ondersteuning in die andesiet was problematies, te wyte aan die onvoorspelbare verandering in rotsverwering. In teenstelling hiermee was die kwartsietdeurgrawing gelykmatig verweer, met egalige naatpatrone, en ontwerpprobleme het grotendeels gekonsentreer op die oorliggende getransporteerde grond.

Loading

Article metrics loading...

/content/civeng1/29/11/EJC25011
1987-11-01
2016-12-07
This is a required field
Please enter a valid email address
Approval was a Success
Invalid data
An Error Occurred
Approval was partially successful, following selected items could not be processed due to error