THE USE OF THE STANDARD PENETRATION TEST FOR THE DESIGN OF BORED PILES IN THE KEUPER MARL OF CARDIFF. PENETRATION TESTING IN THE UK. PROCEEDINGS OF THE GEOTECHNOLOGY CONFERENCE ORGANIZED BY THE INSTITUTION OF CIVIL ENGINEERS AND HELD IN BIRMINGHAM ON 6-8 JULY 1988

This paper describes piling experiences in the Keuper Marl at Cardiff. It uses the results of pile load tests, some on normal piles and some on piles with a void beneath, to propose a design method for bored piles in such stratum. The method relies on the measurement of standard penetration test 'N' values by the site investigation, sufficient to establish an average value representative of the depth of piling in the marl.(A) For the covering abstract of the conference see IRRD 828222.