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I'd consider a shotcrete soil nail wall with under pinning of existing structures. I'd make damn sure your global model is conservative. Most importantly I'd hire a good geotech and do some additional subsurface investigations for this.... this has liability written all over and you want the...

What is tha pad for? We need more info.

Is this for a wall or reinforced embankment?

7' lifts are not recommended, 4' is a better bet and will meet osha recs. Where did the 7' lift come from? I hope that's not in the contract docs.

Not exactly the same structure nor as dynamic but when we are tasked with solar panel array foundation design.... we usually follow LRFD with the unfactored loads provided by the structural engineer.

Proctors on dead sand are a pain but cheaper than min/max density needed for relative density. Depending on how clean the sand is min/max maybe required if you're required to follow the astm (D698/1557). For field testing I'd go with sand cone or nuclear guage... gauge will be best on a larger...

For a slab subgrade I'd recommend compaction testing and proof rolling. I'd focus a few shallow DCPs in the turndowns with random probing. If it's a clean sand, I'd run at least 5-6 increments at each DCP test depth.

As always, thanks for the many responses. We are all really curious to see we reveal during our exploration. So far we are leaning towards abandoned foundations with a slab in the court level.

SRE/MTN, Thanks for your responses. SRE, I've seen that site you screen capped and have done some prior research into the old arena. I found some old you tube videos prepping for implosion. https://youtu.be/4LF4FtdHqsA It looks like they did fill some portion of the arena.

Just for reference, here is a photo of the old structure during construction.

This was a very large structure in its hay day, pre-implosion so I am assuming rubble debris is on the larger side. I don't think there will be much augering with an airtrack.

I'm not convinced that driving H sections would be feasible at this site. Regardless, I appreciate the suggestion hotrod. MTN, those are some good photos, thank you. Do either of y'all have experience using air rotary?

MTN/hotrod, thanks for the response. We are thinking that predrilled boreholes with casing advanced using an airtrack rig may be the better bet. I wouldn't be as concerned with driving in alluvial deposits with cobble. The reinforcement in the concrete has us weary of giving driven piles as a...

Hello all, I am currently working on a project that a large portion of the site falls within the footprint of an arena that was partially below grade to depths of approximately 40 feet. The arena structure was reinforced/post tension concrete that was imploded and the removal of the debris is...

Thanks everyone. One day years from now I hope to reciprocate the same experience to other green engineers as y'all do for me!

oldestguy, thank you!

This is a very broad question, so please go easy on me. I currently work at a geotech firm that mainly uses corrected SPT resistances corresponding with index properties (i.e. atterbergs, moisture contents, gradation, etc.) for giving foundation recommendations. We predominantly practice is the...

fatdad, thanks for sharing. I definitely feel that this could be the case. Was that caused by liquefaction?

Has anyone here had success using geofoam for vibration mitigation? I am working on a modeling project for the design of an isolation slab supported with stem walls, the void space between the foundation, adjacent walls, and beneath the iso-slab will be filled with geofoam. Essentially just a...

BigH, no sweat. I will def look into that, I am still a little wet behind the ears when it comes to calculating seismic induced settlements. The only way I really I know is from a pretty straight forward excel sheet based off the format laid out by seed and idriss. Sometimes I feel that I have...