By R H G Parry, Cambridge University Engineering Department
This paper was first published in GE’s March 1980 issue
This paper was presented (as Paper EUR 49) at the European Offshore Petroleum Conference in London in October 1978, and is reproduced here by kind permission of the orrfanisers. It is the fourth of six papers related to the Heather Platform piling, the first two having been published in GE’s November 1979 issue and the third in January 1980.
The unusually high undrained shear strengths which have been measured in the soil at th!s site are probably a consequence of high lateral effective stress brought about by a substantial degree of overconsolidation. By assuming high, but realistic, values of lateral stress it is shown that these high undrained shear strengths can be predicted. Skin friction values are calculated as a proportion of the undrained shear strength of the soil, the proportion being estimated on the basis of assumed effective stress conditions in the soil adiacent to the pile. Alternative values of skin friction are also calculated by a direct effective stress method.