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Recent content by durtboy505

  1. durtboy505

    estimating subgrade modulus

    Thank you everyone for all the insights. I work in a land of dessicated hard dry clays, that are usually poised to swell. This site was not something we see even once in a blue moon. I posted this to the structural engineer forum because I was hoping to get some feedback from structural...
  2. durtboy505

    estimating subgrade modulus

    I'm in geotech and I'm trying to give a useful number to the structural engineer for designing a mat slab on very soft saturated clays. If using conventional footings and isolated floor we are estimating primary settlements of six inches max and 3 inches differential, and deep foundations not...
  3. durtboy505

    How do I measure the "active depth" of a swelling clay?

    LCruiser, Thank you for correcting me, my question should have addressed long-term moisture changes as well as seasonal ones. I am involved in consulting for commercial, civil, and residential projects all over the southwest. I work on a fair number of "forensics" cases. This issue comes back...
  4. durtboy505

    How do I measure the "active depth" of a swelling clay?

    Hello all I wonder what methods are available for determining the thickness of the zone of seasonal moisture content fluctuation or the "active depth" of a moisture-sensitive clay? I have read that this could extend to depths of 40 feet in some situations? Consulting in Albuquerque, NM, we have...

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