This paper deals with the design of jet grouting cut-offs for dams. Available information from several cases is first reviewed, pointing out the differences between projects concerning dams under construction and operating ones. Various dam types and treatment schemes are considered; functions and requirements of jet grouting cut-offs are defined; possible solutions are proposed. Particular attention is devoted to the occurrence of discontinuities along the cut-offs, which may derive from two main factors: the deviation of the treatment axes and the variation of the jet-columns diameter. A probabilistic design method is developed, in order to minimize the risk of such defects. Drawbacks and advantages of deterministic and probabilistic approaches are finally discussed.
DESIGN OF JET GROUTING CUT-OFFS
CROCE, Paolo;MODONI, Giuseppe
2007-01-01
Abstract
This paper deals with the design of jet grouting cut-offs for dams. Available information from several cases is first reviewed, pointing out the differences between projects concerning dams under construction and operating ones. Various dam types and treatment schemes are considered; functions and requirements of jet grouting cut-offs are defined; possible solutions are proposed. Particular attention is devoted to the occurrence of discontinuities along the cut-offs, which may derive from two main factors: the deviation of the treatment axes and the variation of the jet-columns diameter. A probabilistic design method is developed, in order to minimize the risk of such defects. Drawbacks and advantages of deterministic and probabilistic approaches are finally discussed.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
