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Historical cases and use of horizontal jet grouting solutions with 360? distribution and frontal septum to consolidate very weak and saturated soils


Authors: Guatteri, G., Koshima, A., Lopes, R., Ravaglia, A., Pieroni, M.R.
Source: Geotechnical Aspects of Underground Construction in Soft Ground
Pages: 7
Date: 2008-12-09
Location: Shanghai, China

Abstract
Horizontal jet grouting technology has proved to be quite a versatile tool for dealing with the particular geological conditions encountered when excavating tunnels in soil mass, especially in the presence of water flow and high hydraulic gradient. We describe the state-of-the-art application known as 360? distribution, in which horizontal jet grouting columns are executed around the excavated section, including the invert, and at the far end of the conical treatment, to create a watertight chamber. This results . in a heading that is constantly protected by pre-consolidated soil and minimizes the effects of excavation on nearby structures. We also describe a special tool (called the ?preventer?) designed to control drilling and injection fluid outflow, which proved to be absolutely essential to successful outcomes. We also present the experience gained by the authors in a number of projects in Brazil and Venezuela and the results of a full scale test, executed for the first time in Europe.

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This paper was added to our catalog on Tuesday 27 October, 2009.

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