The Rankine lecture is one of the most prestigious invited lectures in all of geotechnical engineering. The Institute of Civil Engineers has a list of all of the Rankine lecturers and links to most of their lecture papers which are published in Gèotechnique. As far as I can tell, you still need to have access to Gèotechnique's journals to view them, but at least this is a nice central list of all of the papers and past lecturers. [Source: List of Rankine Lecturers at the ICE Virtual Library]
