I'm working on a project for steel helical piles being installed into backfill which is yet to be completed. I could potentially recommend lengthening the proposed piles and installing the helices into undisturbed soil. Even then, there are lateral loads specified and the properties of the soil in the backfill are relevant. Any ideas as to what specifications I should be recommending for the backfill and what soil properties to use in the Lpile analysis? The backfill will be low plasticity clay. In the clay's natural state it is soft (cu ranging from 25kPa to 75kPa). Any advice would be appreciated.
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