Modified rockfall catch fence Mayflower Creek - Detroit Dam : final report.
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Modified rockfall catch fence Mayflower Creek - Detroit Dam : final report.

Filetype[PDF-414.55 KB]


English
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  • Creators:
    Pierson, Lawrence A.
  • Corporate Creators:
    Oregon State Highway Division. Geotechnical Group
  • Subject/TRT Terms:
  • Publication/ Report Number:
    Experimental Feature OR 84-01
  • Resource Type:
    Tech Report
  • Geographical Coverage:
    Oregon
  • Corporate Publisher:
    Oregon State Highway Division. Geotechnical Group
  • Abstract:
    The experimental features project is located on the North Santiam Highway (#162) between Mayflower Creek and Detroit Dam, approximately 40 miles east of Salem. Here access is limited and the slope is nonuniform. To deal with the constant problem of falling rocks in this area the slopes were scaled, catch fences and slope screening were installed, and particularly hazardous rocks were secured with rock bolts. These are all routine functions to secure rockfall areas. On this project however, the following three modifications were proposed to the standard catch fence design and accepted as experimental features:

    1) A triple twist (Gabion [TM] type) wire mesh was used instead of chain link fabric for the catch fence.

    2) The length of the wire mesh draped from the fence was as long as 80 feet instead of the standard 15 feet.

    3) Rock bolts were used to anchor the fence posts.

    The construction aspects of these experimental features were rated as good in the Interim Construction Report dated July, 1986. Those evaluations are included again in this report for reference.

    In addition, this report includes the results of a two year long evaluation of the fence's durability and performance. Durability is based on the fence's ability to withstand the climate and the impact of falling rock. Performance is based on the fence's capability to control rockfalls and thus reduce maintenance cleanup costs. These factors have been evaluated using a "good, fair, poor" rating system.

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