Drilled soldier piles with tiebacks have been proposed to stabilize a slope. The piles are WF sections, in drilled holes, 30" in diameter, backfilled with regular concrete and spaced 6 ft on centers. Installing the tiebacks requires excavating a bench in front of the piles. The excavated surface exposed above the bench requires timber lagging for support. However, the designer requires installing timber lagging also below the bench, down to the slip surface of the slide. What would be the justification to use deep timber lagging, considering that the soil is stiff clay with unconfined compressive strength of 2 kip/sqft? Would this use of deep timber lagging be considered normal practice? Will appreciate your insight.
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