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Recent content by mrwgeo

  1. mrwgeo

    burn dump ash

    Does anyone have reference sources, or personnal experience, with mechanical properties of burn dump ash? We need to do stability analyses to determine an appropriate slope angle for a soil cover on an existing mound, but we are not allowed to do any subsurface exploration and will need to use...
  2. mrwgeo

    Major Shrinkage?

    Riggly - I agree with your definition of shrinkage, but in my part of the world (Calif.) "shrinkage and bulking" are the colloquial terms for the change in volume of material from cut to fill.
  3. mrwgeo

    Seismic Site-Specific Analysis Info, please

    "site specific" means different things to different people. $2000-$3000 likely means they are using a program like FRISKSP to perform a probabilistic assessment. The only consideration of site geology will be in selection of the attenuation relationship. Probabilistic studies can be...
  4. mrwgeo

    Geotextile Fabric Clogging

    With all due respect to FOCHT3, who is a great resource on most topics, Harry Seed is one of the great names in liquefaction but way out of date. I suggest you start at: http://www.ce.washington.edu/~liquefaction/html/main.html Description of study elements & a good reference list...
  5. mrwgeo

    Geotech data for trenchless construction

    I am preparing a proposal to provide a geotech study for design & construction of a 30" sewer force main. Pipe material has not been selected. Channel crossings (to 25 ft deep) will be construced using trenchless methods. Soils are unconsolidated alluvial clay and sand beds. Typically...
  6. mrwgeo

    Whole Lotta Shakin' Goin' On

    JAS2, I'm curious, what method are you using to obtain deep shear wave velocities from surface measurements?
  7. mrwgeo

    AWWA seismic response spectrum

    AWWA standards for water tank design (e.g. D-100-96) state that for design of tanks (paraphrase) "in an active fault zone capable of generating magnitude 7.0 or greater event, consideration should be given to developing a seismic response spectrum." The California Geological Survery...

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