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  • 1.  Geology, earthslides

    Posted 01-20-2017 05:34 PM
    I am looking for indications in the professional Literatur regarding velocity of earthslides. The idea is to know the Level of risk based on the velocity of a slide, where the term  probability is connected to the velocity. Example: based on experience a velocity around 20cm/year means a low probability of  increasing velocity. A velocity higher 100cm/year means  high probability for a breakout. Thanks for helpful hints.

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    Peter Friedli Aff.M.ASCE
    Forch
    410041 0449800486
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  • 2.  RE: Geology, earthslides

    Posted 01-21-2017 10:38 AM
    Chapter 3, Table 3-5 of Special Publication 247 "Landslides" discusses 7 velocity classes and the velocity of different landslide types.  Class 1 is "Imperceptible without instrumentation..." and class 7 is "Catastrophe of major violence....escape unlikely"

    According to Figure 3-16 in the publication Varnes, 1978 rates 6 to 150 cm per year as "very slow".  These landslide rates are probably correspond to velocity class 2 to velocity class 3.

    Landslides: Investigation and Mitigation : Special Report 247 (Special Report (National Research Council (U S) Transportation Research Board))
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    Landslides: Investigation and Mitigation : Special Report 247 (Special Report (National Research Council (U S) Transportation Research Board))
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    Mark Myers P.E., M.ASCE
    ASSOCIATE ENGIN
    Cal Engineering & Geology Inc
    Walnut Creek CA
    (925) 229-5308
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    Original Message


  • 3.  RE: Geology, earthslides

    Posted 01-22-2017 03:18 PM
    Thank you so much, Mark - it's exactly what I was looking for, great!

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    Peter Friedli Aff.M.ASCE
    Forch
    410041 0449800486
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    Original Message


  • 4.  RE: Geology, earthslides

    Posted 01-24-2017 02:23 PM
      |   view attached

    The Rate of Slope Movement Scale, illustrating an approximate ranges of rates of movement by Varnes (1978)  was originally published as Figure 2.1u in Slope Movement and Types and Processes. In Landslides: Analysis and Control, Transportation Research Board, National Academy of Sciences, Washington, D.C., Special Report 176, Chapter 2, 1978.

    The original figure was appended as a folded drawing sheet in the back of the publication, but a reference to the text chapter may be found here:

    http://onlinepubs.trb.org/Onlinepubs/sr/sr176/176-002.pdf


    A scanned copy of the figure has been appended for academic use only, with attribution to the original author.



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    D.A. Vellone P.G., CPG, M.ASCE
    Northeast Regional Geologist

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    Varnes 1978 Rate of Movement Scale.pdf   23 KB 1 version
    Original Message


  • 5.  RE: Geology, earthslides

    Posted 01-26-2017 09:35 AM
    In the text Landslides in Practice by Derek H. Cornforth, Derek discusses the landslide velocity versus static factor of safety for the Upper Pelton Slide, Oregon. He also references Cornforth and Vessely (1992). Factors of Safety During Landslide Movements, Proceedings of the Sixth International Symposium on Landslides, Christchurch, New Zealand, VOL 1, pp. 367-372.

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    David Arellano, Ph.D., P.E., M.ASCE
    Associate Professor
    University of Memphis
    Memphis TN
    darellan@...
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    Original Message


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