Contiguous Bored Piles and Secant Piles
A Contiguous bored pile wall is an earth retention system formed by installing closely spaced Bored piles, with a small gap between adjacent piles. In contrast, a Secant pile wall is an earth retention system formed by installing overlapping Bored piles. These walls are designed either as cantilevered or with a variety of supports (ground anchors, walers & struts, etc.). Secant piles are usually selected where there are particular concerns about groundwater inflow, i.e. where there is a high groundwater table and permeable soils.