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  1. drt

    Placing a scanned Image behind a Plot

    Hello, I've struggle with this for a long time. What i want to do is scan a classic plot from a text book (which contains hundreds of data points and line boundaries) then plot my data over top of it. This way is can see exactly where my data points fall with respect to the original...
  2. drt

    leak on carpet- sunkin floor

    lailla1, Sounds like you need to change the drainage characteristics of your lot. You need to create positive drainage away from the foundation and ideally towards some type of collection device (area drain inlet). Take a shovel and either raise the elevation of the soil immediately adjacent...
  3. drt

    Drain Pipe Perforations - Up or Down?

    Looks like I’m a little late on this one, but here's my two cents. I trying to imagine a pipe sitting on top of a sloped ground with the perforations aligned perfectly UP. If I take a hose and spray water along the length of the pipe, I can't imagine much water getting in. Then imagine the...
  4. drt

    Footer at edge of slope

    jiml66, Check with the building/engineering department in your city. The city should have minimum top of slope and bottom of slope setback criteria which you must follow in order to get your permit. Your are going to get a permit, right? If you are considering errosion, sounds like your at...
  5. drt

    Good Introduction to Visual Basic in Excel

    I've been an Excel user for the last 10 years or so and I am just getting into recording macros and now i want to begin to understand visual basic. Just wondering what is considered the best introduction to visual basic.
  6. drt

    adding portland cement to soil

    Hello, When adding portland cement to a silty or sandy material, what is the effect on the shear strength. Obviously, the cohesion will increase, similar to a naturally cemented deposit but what happens to phi ? Does addding portland cement to soil only increse the cohesion and the...
  7. drt

    Slope stabilization using soil mixing

    Hello, Does anybody have any information or technical references for usage of deep soil mixing to stabilize a landslide ? We initially proposed to use tiebacks to provide an acceptable factor of safety but other have proposed creating a series of 5 foot diameter soil-cement columns through the...
  8. drt

    Modulus of subgrade reaction

    Domdem, The modulus of sudgrade reaction is determined from a plate loading test, in which a 30 inch diameter steel plate is loading using a steel jack and beam (for reaction). The load is applied at a predetermined rate until a pressure of 10 psi (69 kPa) is reached. The pressure is held...
  9. drt

    Shear Strength Correlations

    There is great paper title "Shear Strength Correlation for Geotechnical Engineering" by J.M. Duncan, R.C. Horz and T.L Yang from the Virginia Tech. Department of Civil Engineering. This paper 100-page paper is very useful, but at the same time can be dangerous. Dangerous in that...
  10. drt

    Cv for peat

    Dr. Tuncer Edil from the University of Wisconsin-Madison is an expert in this field. Try tracking down some of this papers. From my very limited experience with peat: 1. Your right cv is high, but it decreases rapidly as the void ratio decreases. 2. Primary settlement is probably not an...
  11. drt

    determing preconsolidation pressure - alternate method

    I remember their being "another" method to determine the preconsolidaton pressure, other than Casagrande's emprical construction method. Either this method is commonly used in Brazil or the person who developed the method is Brazillian. ANyways, this method doesn't rely on picking...
  12. drt

    PT slab on grade for slope creep

    Does anybody know if PT slab grade foundations are used to help mitigate the effects of slope creep ? Slope creep is a phenomena which occurs on slopes constructed of expansive soils. After several years of wetting and drying cycles the slope begins to creep downhill. Slope creep eventually...
  13. drt

    rapid drawdown slope stabilty analysis

    I'm performing a rapid drawdown analysis for a 2:1 slope, 25 feet tall, phi = 26 and c=300 psf. I used the charts contained in Morgenstern's "Stability Charts for Earth Slopes During Rapid Drawdown" (Geotechnique, 1960?) and was able to extrapolate to find FS=1.49. However, for my...

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