Is there any published guidance as to the minimum strength of grout for drilled micropile and lagging walls (fully cased piles)? I’ve seen 4000 psi in the past, which seems overkill.
We always spec 100 psi CLSM for drilled SPL. I’m guessing traditional flow fill CLSM might be difficult to pump...
We have a job with some small and awkward drilled SPL alignments (U-shaped alignment behind bridge abutments). The short spans and shape make the drilled SPL spacing somewhat tight. The typical rule of thumb that I've seen is waiting 24 hours before drilling within 3 pile diameters of a newly...
This underpinning project came across my desk for review. I was hoping to get some opinions on the load transfer and resulting deflection of the pile to see if I'm overthinking this. The pile will not be preloaded so the load transfer will cause some amount of settlement of the existing...
I'd like to take a survey of how you folks typically to deal with strip footings that are supported on rock and soil. I've seen reports require:
-Over excavation of the rock by 12-inches and replaced with granular fill.
-Transition zones of about 20' long that include over excavating about 18"...
We're proposing repairs to a 30' tall MSE wall that is showing signs of movement and distress. One option we're proposing is drilling soil nails through the wall face and then shooting a new concrete face. The only issue we're having is the wall has a 90 deg outside corner. Is splaying the soil...
Does anyone have experience with no-fines concrete when tremie placed underwater? We have a situation where the owner (the State) would like to fill the void between a new bulkhead and an old bulkhead with concrete. We are worried about large differential water levels if the void was filled with...
I'm preparing a response to a RFP for a project to re-located a University's sailing team building and pier facilities. They are looking for to have the A/E team survey the existing facilities, including "sea state conditions". While I have asked for clarification on this item I'm stuck...
https://6abc.com/i295-retaining-wall-bellmawr-new-jersey-rt-42-nj-dot/10448444/
Looks like a nice global stability failure. My contact believes the wall is supported on rigid inclusions by Menard. What a mess.
I have a job that requires 20'-30' retaining walls and 1H:1V reinforced soil slopes for site development. Everything is very preliminary at the moment but the Civil is currently showing large stormwater infiltration systems very close to the walls and slopes. Close enough to make anyone start...
When looking at liquefaction potential for a marine structure, such as a pier, it's common to have a relatively large head of seawater above the mudline. This can drive the effective stress down to a negative value causing a medium dense or dense sand layer to be potentially liquefiable using...
I have a soil nail wall to be faced with MSE blocks. Due to space constraints, I plan to require the grid to be installed into the shotcrete facing, with the grid wrapped around continuous #4 bars.
Are there any official guidelines for calculating minimum embedment lengths of geogrid into the...
This question is for the engineers in the USA. I've noticed that geotechnical reports from some companies are copyrighted. Does anyone know why companies are doing that and if there is any real legal action that can be taken if someone else uses their language? It just seems odd to me.
I'm wondering if anyone has input on cutoff pressures for compaction grouting. We'll be mitigating from 100 feet below ground surface up to 5 - 10 feet below grade. The ASCE compaction grouting consensus guide states that most soils are effectively compacted at a sustained pressure with a rage...
