Thank you for the reply. Augercast piles/preboring might not be possible options since sheet piles are going to be driven. The sheet piles are to be driven about 5 feet into sand and 2 to 4 feet into stiff clay. The problem is that there are structures nearby (100-150ft). We had previously...
Try to contact the manufacturers for the geotextile, they might be of help. I know a friend who called them about some soil-geotextile interaction issues and got a positive response.
Let me know if this does not work out.
Panars,
I used the Brom's method, I only get about 8 feet length. That is when I started looking for min embedment depth criteria.
BigH,
Thanks, I am looking through the other posts.
BigH,
I checked the DM 7.2 after you said. Looks like AASHTO took the table from there. Its exactly the same one. Although the table id given in the ASD Analysis section, I think the values would be universal. Would'nt you agree?
nsong,
Refer to Table 5.5.2B in the AASHTO Standard Specifications for Highway Bridges. They have a range of values for different types of soils and foundations. A max value of 0.7 may be used for concrete foundations on clean sound rock. I have never seen anyone use 0.9.
Everyone,
Thank you for the valuable posts.
Panars,
I agree with you about DRIVEN program. I am also using the FHWA-IF-99-025 (Drilled Shafts: Construction Procedures and Design Methods). Table 13.1, P333 gives the Min Shaft penetrations for lateral loading. I am getting 42 feet length. I am not...
I am using the FHWA approved DRIVEN program to calculate the drilled shaft foundation lengths for several overhead sign structures. My shaft lengths are coming out to be very small (5 to 8 feet). I think they are too low possibly due to bigger diameters being used by the SE (36-inch). Are there...
swine,
I am not sure about what you designed for but this foundation analysis is for a Bridge Abutment 150 feet wide passing over a six-lane highway. They are going to use micropiles and H-piles combination. I am not gonna get off as easy as your soils engr.
UcfSE,
I agree with what you say.."accurately estimating" is a bit of a loose term so to speak and hence my posting. The SE I am working with insists that I do that and I am not sure how to do that!
I am referring to Bowles it has some equations and stuff but to estimate that for 50 Borings...
Can anyone suggest ways of accurately estimating the Modulus of Subgrade Reaction for a soil. Available parameters:
SPT N values, Moisture, Unconfined Compressive Strength & Angle of Internal Friction.
Is the Soil Spring Constant the same as Modulus of Subgrade reacton? I argued with a collegue that it is not. Please tell me I am right! Can anyone give me references where I can get some info about Soil Spring Constant.