This paper describes results from a series of full scale tests on high voltage (HV) transmission tower foundations at a London clay site in Kent. The poor performance of these foundations using standard testing practice in contrast with the rarity of in service failure has led to a climate of uncertainty where the uplift capacity of HV transmission tower foundations is not readily understood. The tests aimed to mimic certain in-service dynamic (wind) loading in order to reveal the mechanisms associated with (rapid) foundation uplift. Foundations founded on London clay mobilised significantly greater uplift capacities at smaller displacements compared with current industry testing practice. The results contained herein suggest that not only is a revision of testing practice is required but also that of construction practice.
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