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The 60th Rankine lecture will explore a wide range of processes which have substantial consequences in geotechnical engineering and yet have received little
formal attention.
The lecture will first examine the behaviour of support fluids used in piling, diaphragm wall construction, tunnelling, and horizontal directional drilling processes, which have been strongly influenced by analogies with oil well drilling operations. However, the role of the support fluid in each of these applications is different and it would be a mistake to assume that the key properties are the same for all of them.

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