Abstract:
This paper outlines a detailed methodology that assists in selecting the optimal foundation systems for transmission line structures across remote and diverse geological landscapes. The Investigative Drilling (ID) Method presents a systematic approach that combines geotechnical investigation with constructability evaluation and environmental factors into a single decision-making framework developed from field experience on many transmission line projects across Australia and New Zealand. The methodology tackles the specific difficulties of remote transmission line projects by addressing factors such as limited access to site locations, geological diversity and logistical challenges. Major transmission line projects benefit from this approach by achieving substantial foundation cost reductions and minimising environmental impacts while enhancing construction efficiency through customised foundation solutions. The research demonstrates that initiating detailed geotechnical assessments early in the project leads to efficient foundation construction, which lowers environmental consequences and achieves project success. This paper explains both the theoretical and practical aspects of its methodology, introducing a logical model to select site-specific foundations suitable for different infrastructure projects within challenging environments.