Publication Abstract

Proceedings - Third International Conference - Piling and Deep Foundations, 1989, London, England, (ICDF)

The use of a reverse circulation diaphragm walling technique to form a plastic cut-off wall around Sizewell B Power Station
H.F. Cowie; Stent-Soletanche Joint Venture, Hook, Hampshire, UK J.D. Crawley; Stent-Soletanche Joint Venture, Hook, Hampshire, UK

Britain's first pressurized water reactor (PWR) Nuclear Power Station is now under construction at Sizewell on the Suffolk coast. A linear cut-off wall was proposed to ensure that the drawdown of water to some 14m below sea level in the overlying sands during construction of the new power station would not affect the existing adjacent nuclear power station. The low permeability cut-off wall was constructed by diaphragm walling techniques by excavating a continuous deep trench supported by bentonite mud and then displacing the bentonite by a plastic concrete to form the "impermeable" membrane. The paper describes the automated digging required to achieve completion within program, control methods used to obtain the high vertical tolerances and the properties of the plastic concrete and the production plant used for its production.

 article #556; publication #39 (IC-1989)