I'd be looking at a heavy 6 x 6 grid as a pass through that's readily replaceable when it rusts out, if you want to put a swinging grill in the middle then maybe okay. County may not have authority to regulate, this may be a private/private party issue. The 18 inches likely doesn't have a...
Typically we use gabions, but California RWQCB environmental review prevents us from using gabions near a creek for fear critters will get caught and die. Similarly we can't do a sheet pile wall because we're operating under a general permit which prohibits pile driving. So we have a tieback...
In designing the lagging, it looks like ACI 318 Section 9.3.3.1 and Table 9.6.3.1 result in no stirrups required as Vu in not greater than(phi)Vc and the depth is less than 10 inches. I do plan on putting #3 at 8" o.c. beginning 2" from the ends to the middle. I was stumped as to why the...
Talked to managing engineer. We just got blanket NEPA approval for 20+ sites, but no driven piles are allowed. So no SSPs. Gabions have also been rejected for environmental reasons, apparently trap and kill small animals. He's good with going 38 feet to better material with drilled soldier...
Agreed, I could do RSP at 1:1, but managing engineer won't consider it at 1:1 and 1.5:1 will take it to the thalweg so environmental review likely to reject.
Talked to the Geotech. She won't give me any bearing on clay layer so floating soldier pile wall on clay layer with two tiebacks out...
The wall is to move the improvements away from the creek. This has to go through NEPA/CEQA/US Fish & Wildlife review and they don't want anything near the creek. I hear you on the soil nails, I was just looking into. I could slope at 3/4:1 per OSHA max and then use soil nails. Do soil nails...
Definitely appreciate all the help. Those 2'-6" caissons would definitely work. I assume the concrete simply displaces the water in the caisson, hence no dewatering. I have water at 15 ft down. If I do go down 40 feet to good material are there any considerations with buckling from...
Flood plain may go to top of wall.
Agreed sheet pile wall to below 40' would greatly reduce any future potential scour or meander from the creek. That is likely the most conservative solution.
Thanks for the reference to the FHWA Drilled Shaft Manual. That covers quite a bit of this in more...
The piles are drilled (r=1.25), the W section lowered into place, and then concrete.
The radius is 1.25 feet or 2.5 feet diameter.
Circumference = 2* pi * r.
Area = circumference * height
Resistance Force from slip friction = Area * 200 psf * resistance factor of .55 = 2(pi)(1.25'radius)(9'...
I have an 11 foot wall to support a road next to a creek in an alluvial floodplain in very poor soil. The geotech engineer is not allowing any bearing, only 200 psf in slip friction for nine feet of sandy strata beginning two feet under the lagging for nine feet in depth (13-22ft). Under that...
