It is correct to continue the active pressure on the retained soil side of the sheet pile. You say "Thinking about this problem logically, burying a steel sheet pile wall underground with soil on each side should not generate any force on the sheet pile wall." This is incorrect. Lateral earth...
gte447f - you are correct about the degradation of the coir logs. I should have educated myself more about their lifespan before I responded. I initially suggested them because I was thinking of something that could act as a filter to prevent loss of your wall base material (something that...
I take it that this is in a private owner's backyard and thus aesthetics are important and loss of usable space would be preferably avoided. I wonder if you could do something with coir fibre logs in front of the wall to build up the grade a little. If you wanted to assure yourself that these...
I imagine you are using Rankine earth pressure to check the stability of this wall. Rankine substantially underestimates passive pressure. Instead, try using log-spiral theory for the passive pressure at the embedded portion of the wall. This may not solve your problem entirely but you'll...
Another option to consider is some type of buried arch structure. I'm not sure where you are located but if you're in the US or Canada, reach out to underground product suppliers like DSI, Jennmar, or Reinforced Earth. Their products are typically not used on habitable structures (unless...
This is a bad idea. Please contact a structural engineer with experience in underground structures. I do not want to be disrespectful, but I also don't want you to attempt this project as you've described it.
If (and this is a big if) you can satisfy your self that the rock will not apply lateral load, here are a few text sources for reduced lateral pressure from smaller active soil wedges. If you can't get ahold of hardcopies, try Internet Archive.
Chapter on Fascia Walls in Geotechnical...
Though I have not quantified the rotational stiffness of the connection between the wide flange and the pipe with any sophisticated analysis, I can content myself that the connection can be approximated as a rigid joint. The web of the wide flange is slotted quite deep into the pipe (750mm is...
Thank you both for your replies! They are very helpful. I've found the paper by Dalal which Lomarandil referenced. It looks very promising. I've also provided a link to the pdf below for anyone visiting this thread in the...
Hello.
My company designs support of excavation and often incorporates steel pipe struts/corner braces. These members consist of pipe with pieces of wide flange slotted into the ends of the pipe. The purpose of the wide flange sections is to create a better welded connection to the vertical...
I would recommend checking whether you can develop the necessary horizontal resistance through friction between the block and the ground. Backfilling with soil next to the blocks may not be necessary at all.
If you can't develop the required resistance, then decide which theory of passive...
I think you are confusing yourself by thinking about multiplying individual properties. In my opinion, the best approach is to determine the lateral earth pressures acting on you wall for the various cohesive/non-cohesive layers (i.e. in psf, ksf, kPa, etc.) and then multiply these values by...
There are many free online (American) resources which can give you good insight to shoring design. These include, but are not limited to:
-California Trenching and Shoring Manual
-NAVFAC Design Manuals 7.1 & 7.2
-FHWA Lateral Support Systems and Underpinning
-FHWA Geotechnical Circular No...
After school (bachelor degree in structural engineering), I worked for a deep foundations, support of excavation contractor. I started as a site coordinator and then became a site super. I knew I ultimately wanted to work in design, so after 3.5 years, I enrolled in an online structural...
Below is a tieback connection detail from the Earth Retention Systems Handbook by Alan MacNab. This image is for a soldier system but the overall scheme can be applied to sheet piles.https://files.engineering.com/getfile.aspx?folder=c3a89fb0-9c34-48ea-9af7-ad3d0a889c12&file=20231125_155604.jpg
A possible alternative to the base plate and HSS stool components is to use a thick, equal-leg (for 45deg tie rods) angle with a hole cut in one of the legs to allow the tie rod to pass through. You could then eliminate the bottom plate and have the channels bear directly against the angle. I...
It's worth pointing out that for your particular sketch, a waler would not be required because you have a an anchor at each sheet pair. However, if it's your intent to have one anchor support multiple sheet pairs, then a disadvantage of having the waler on the soil side is that each sheet pair...
Hello all! This is my first first post.
I have recently been tasked with reviewing some designs for rib and liner plate shafts. I have worked on rib and lagging shafts before but unlike those, the load is transfered to the ribs at discrete locations at the blocking points. The designs I'm...
