ABSTRACT
A detailed geotechnical investigation was carried out in order to determine the founding conditions and level to bedrock. The drilling results indicate that the Middelburg Abutment and eastern piers are founded on very soft to soft rock Mudstone, with the Witbank Abutment founded on silty sand
1 INTRODUCTION AND BACKGROUND
Bridge B421 is located on the R555 between Witbank (eMalahleni), and Middelburg in the province of Mpumalanga. It is a four span bridge, with each span comprising a simply supported voided slab. The piers are wall-type on spread footings and the abutments are wall-type closed abutments with splayed wing walls on spread footings.
