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  1. VanNuysDave

    Shear force values of concrete in shear pin design

    Understood - maybe didn't make myself clear - this application is for slope instability (landslide) where the factor of safety is less than the Building Code minimum (1.5) and the shear pins are installed based on the results of site investigation of the soil/bedrock profile and the subsequent...
  2. VanNuysDave

    Shear force values of concrete in shear pin design

    As stability analysis software becomes more sophisticated, we can now realistically incorporate stabilization mitigation methods into the slopes - specifcally - shear pins. Typicaly we find that shear pins are either driven steel piles or CIP bored piles with either a cage or a beam and CIP's...
  3. VanNuysDave

    Seismically induced lateral spreading on multiple pile foundations

    As usual - thanks to everyone ahead of time. The subject is a question that is becoming more complex and more challenging for us folks in Seismic Zone 4 and more financially cripling for those who build using our analyses. When we have projects that are subject to deep liquefaction and large...
  4. VanNuysDave

    Liquefaction - effect of liq. zone below 40 feet of dense fill

    Ladies and gentlemen, This is the site - 6 acres – flat area on an east/west trending, Southern California, alluvial filled canyon - soil profile transitions from bedrock on the south to dry loose sand to saturated loose sand in the bottom of the canyon (50 feet +-) in a northerly direction -...
  5. VanNuysDave

    Pre-saturating and post-saturation measurements of shear samples

    Although pre-saturating is part of sample preparation that is performed in laboratories many times a day, this question is both a "how to do it properly and practically", and a research questionaire to identify the state of practice methods used by geotechnical testing laboratories to correctly...
  6. VanNuysDave

    Mud and Debris Flow analysis

    Many thanks to BigH & Focht3 for your comments. Yes, I guess I certainly oversimplified the discussion in my question. I am aware of the extremely complex nature, causes and analysis of mud and debris flows. The mud flow criteria I am examining is not related to very large native sites with...
  7. VanNuysDave

    Mud and Debris Flow analysis

    As all of us in Southern California are well aware, this winter will, and already has produced catastrophic mud and debris flows on the hillsides denuded by the wild fires. In determining the flow velocity, mud concentration and subsequent mud flow rate, I have been unable to find any...
  8. VanNuysDave

    Pile Driving

    Gentlemen: I really appreciate your thoughts on my "prebore" question. May be a little more info on the specific conditions will allow you to clarify your comments or raise more ire! The soil profile is 30 feet of seismically liquefiable hydraulic fill and native silty sands overlying...
  9. VanNuysDave

    Pile Driving

    I am looking for good references related to preboring prior to installing and driving precast prestressed concrete piles. The question is 'how large should the diameter of the prebored hole be in relationship to the pile diameter (or cross sectional area)and what effect does the prebore have on...

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