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Jet grouting was implemented to protect an existing building against the impact of adjacent secant pile wall installation located 2ft from the building edge. Sixteen vertical jet grout columns, 5ft in diameter and spaced at 47ins intervals, were installed at 1.5ft offset from the external face of the building to form a continuous grout wall to underpin the basement foundations. As the secant pile wall was located in close proximity to the row of underpinning jet grout columns, subsequent casing installation would be problematic having to drill through partially grouted and partially ungrouted soils. The unbalanced drilling would lead to significant pile deviation and cause damage to the completed underpinning jet grout columns. To overcome this, an additional row of jet grout columns was introduced along the secant pile wall line at the primary pile positions to provide full coverage of grouting for the drilling platform. A range of column diameters from 5 to 6.5ft was formed to ensure effective interlock between columns. This innovative scheme provided a stable platform that allowed the secant piles to be installed through consistent material and minimized disturbance to the adjacent building foundation. This paper discusses the design considerations and practical issues associated with the implementation of the jet grouting work.
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