Development of a rockfall hazard rating matrix for the State of Ohio : executive summary report.
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Development of a rockfall hazard rating matrix for the State of Ohio : executive summary report.

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English
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  • Creators:
    Shakoor, Abdul
  • Corporate Creators:
    Kent State University. Dept. of Geology
  • Corporate Contributors:
    Ohio. Dept. of Transportation
  • Subject/TRT Terms:
  • Publication/ Report Number:
    FHWA/OH-2005/005
  • Resource Type:
    Tech Report
  • Geographical Coverage:
    Ohio
  • Edition:
    Executive summary report.
  • Corporate Publisher:
    Kent State University. Dept. of Geology
  • Abstract:
    The geology in Ohio is characterized by the

    presence of gently dipping, harder, more competent

    strata (siltstones, sandstones, limestones) alternating

    with softer, less competent strata (claystones,

    mudstones, sha les). This type of stratigraphy is

    highly susceptible to differential weathering which

    results in undercutting of the competent layers by

    erosion of the incompetent layers. Undercutting

    promotes a variety of slope movements such as

    rockfalls, plane failures, and wedge failures that

    may not occur otherwise. Many of the slope failures

    in Ohio initiate as plane failures and wedge failures

    in competent strata at higher elevations and descend

    as rockfalls. The frequency and size of these falls

    depend upon joint spacing within the competent

    unit and the extent by which it has been undercut.

    The undercutting- induced failures can be quite

    hazardous because of their instantaneous

    occurrence, high speed, and occasionally large

    volume of rock involved. There are many road cuts

    in Ohio, however, where closely jointed rock units

    lead to rockfalls without the presence of

    undercutting. This study was undertaken to develop

    a rating matrix that could be used to rank order the

    slopes in terms of their hazard potential with respect

    to rockfalls.

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