Excavation/shoring in deep sand
Excavation/shoring in deep sand
(OP)
We have a need to excavate up to 20 feet deep next to a building foundation. The geology consists mainly of uniform sand down to about 100 feet. Water table is about 10 feet below grade. The area to be excavated is approximately 100' x 150'.
Any options/suggestions for shoring the pit?
Any options/suggestions for shoring the pit?





RE: Excavation/shoring in deep sand
The only soils which I am aware of that respond reasonably well are some poorly to possibly moderately poorly graded sand and possibly gravels. Fine grained soils (silts and clays) or soils with fine grained components usually achieve 78% to 85% of ASTM D-698 maximum density if conditions are good. Good conditions require extremely good drainage characteristic of the flooding water into the adjoining soil. If the water cannot drain from the backfill soils, the material will be setup for future collapse. This is very similar to the mechanics exhibited in mudflows and debris flows, which oftentimes become metastable (collapsible) soil.
RE: Excavation/shoring in deep sand
RE: Excavation/shoring in deep sand
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RE: Excavation/shoring in deep sand
Good Luck with your project!
P.S. You may want to post this in the Earth Retention Forum for more comments.
RE: Excavation/shoring in deep sand
Most excavation I did near structures was to remove contaminated materials and we would do piece work to limit open areas and leave as much adjacent soils in place to keep load on the soils next to the foundation as we could. We used modular shoring boxes sometimes which are very rigid but mostly useful on smaller excavations. Sometimes tight sheeting was more useful especially where groundwater control was paramount. DRC1 gives you a great amount of information and good advise in his post. Best wishes on your project.
RE: Excavation/shoring in deep sand
This is just a rough idea that is typically used, good luck.
RE: Excavation/shoring in deep sand