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to get the lateral subgrade modulus, divide the vertical subgrade modulus by 1.5 times the pile diameter. To get the vertical subgrade modulus, refer to Terzhagi's 1955 paper.

Does anyone know a good reference for determining loading to apply on a residential post tensioned slab, or any slab for that matter? The PTI manual and any other reference that I've ever seen has examples that start you off with a declared uniform load value, say 80 psf, and a perimeter line...

PT Slabs are very common in Southeast Louisiana. We have some of the softest soils in the country. But our soils in this area are not typically expansive, they are more compressible.

Has anyone ever heard of a paper written by Pfeffer (sp?) concerning vibrations in New Orleans area soils due to various types of construction activities? If so, please let me know where I can find it.

I would design this wall in the "at rest" state. The wall should not be deflecting, therefore, active pressure will not occur. As for the Peck 1969 apparent pressure diagram, this pressure is emperical, and is usually reserved for "top-down" construction, such as a braced...

A cablelock or permalock shoring solution would be great in this case. It would probably cost between $5000 to $10000, depending on your location and size of your home. These methods are used extensively in the New Orleans are, where we have very soft to soft clay foundations. See the website...

It's not that geotechnical engineering is too vague...it's just cutting edge.

No I'm with the New Orleans District. Thanks for the info. I will try and locate the Matlock, Bogard et al study.

Focht3, Is your thesis published? I am doing a lateral load test in Harvey, LA for a Sector Gate some in the next couple of months. The information in your thesis would probably be useful. If it is not published, do you know how I can see a copy (on-line at Univ of Texas perhaps?

A guide for I-wall design is EM 1110-2-2504. This is a Corps of Engineeris manual that we use to design all I-walls in the New Orleans area. Another reference would be Virginia Tech's manual called "An Engineering Manual for Sheet Pile Walls". Also the Pile Buck manual or the US Steel...

I would not use SPT data for any cohesive material. A piezocone or a flat dialatometer would be useful in determining the OCR.

Focht3 is correct. You should not use a calculated value in the design phase of a project. The k value depends on the soil and the movement of the structure relative to the soil. I would suggest and in-situ test, such as a flat dilatometer test (DMT) or pressuremeter test (PMT).