Landslide Technology
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Greens Creek Mine Access Road Stability Assessment and Slide Repair 

Admiralty Island, Alaska
Construction of the MSE WallConstruction of the MSE Wall
A single access road that accessed a mine site was experiencing landslide activity. Photographs taken during construction suggest that the roadway was built by excavating into the relatively steep hillside and sidecasting the excavated materials to the outboard side.

The slope stability problems were first noted during a heat plume was observed on the slope outside of the guardrail, which suggested a ground crack beneath the snow. In the following years there was evidence of additional slope distress indicated by displacement of the guardrail posts, cracks and sinkholes on the hillside and road surface, small slumps occurring in the road cut on the inboard side, seeps developing near the toe of the embankment, and falling rock occurring from a nearby exposed rock face.

Landslide Technology (LT) was retained to perform geotechnical reconnaissance of the problem areas, and to design landslide mitigation measures that could be constructed using locally-available fill materials and simple construction techniques. Following a subsurface investigation, LT designed a 100- by 14-foot MSE retaining wall that required only geogrid and facing material to be imported to the site and was easily constructed during a brief period when the main facilities were closed for maintenance. The construction was successfully completed over three work shifts. Much of the equipment and labor was provided by the mine's operations and maintenance crews.

Following this fast-track design and construction, LT has assisted the owner with a landslide and rockfall inventory of the access road in order to avoid costly road closures and unscheduled repairs.


Services Provided:

  • Geologic reconnaissance of landslide areas
  • Site investigation by borings and test pits
  • Landslide instrumentation
  • Landslide hazard mapping
  • Slope stability analyses
  • Evaluation of appropriate remedial options
  • Technical assistance to owner during construction
  • Buttresses and retaining wall systems
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  • Home
  • Specialty Services
    • Geotech. Asset Mgmt. >
      • Montana Rock Slope Asset Mgmt. Program (RAMP)
      • Alaska Geotech Asset Mgmt
      • Ohio Landslide Inventory
    • Rope Access
    • 3D Modeling
    • Dam Safety & Slope Stability
    • Const. Sequence Modeling
    • Geotechnical Instrumentation
    • Construction Engineering
    • Expert Witness
  • Landslides
    • Hydropower >
      • Bull Run Flume
      • Swift Powerhouse
      • Frog Lake Dam Slide
    • Transportation >
      • Hwy 101 Johnson Creek
      • Looking Glass Hill Slides
      • SR 87 Arizona Slide
      • Togwotee Pass Road
      • Scoby Hill Landslide
      • Wrangell Airport
      • Snowbasin Access Road
      • Beartooth Debris Flows
      • Three Capes Scenic Loop Landslide
      • Richardson Hwy Slide
      • Bonners Ferry Landslide
      • Light Rail Station
      • Skagway Submarine Slide
    • Natural Resources >
      • West Africa Gas Pipeline
      • Greens Creek Mine Road
    • Private Clients >
      • Wasco County Landfill Landslide
  • Rock Slopes
    • Hydropower >
      • Biscuit Rock Rockslide
      • Skagit River Rockfall
      • JC Boyle Canal Rockfall
      • Prospect Dam Rockfall
      • Iron Gate Dam Rockfall
      • Cougar Dam Rockfall
    • Transportation >
      • I-15 (D3) Rock Slope Mitigation
      • Ketchikan Third Avenue
      • US Hwy 2 Libby Rockfall
      • Banks - Lowman Hwy
      • SR 191 Rock Cut Design
      • Going-to-the-Sun Road
      • SR 12 Rockfall Mitigation
      • Lakeside Rockfall
      • US 2 Badrock Canyon
      • South Tongass Highway
      • Weeksville Rock Bolting
      • US 26 Cove Palisades
  • Key Staff
    • Mike Meyer
    • Gerry Heslin
    • George Machan
    • Charlie Hammond
    • Brent Black
    • Darren Beckstrand
    • Chris Carpenter
    • Ben George
    • Wade Osborne
    • Tom Westover
    • Aine Mines
    • Adam Koslofsky
    • Logan Allender
    • Andy Kost
    • Collin McCormick
    • Anna Casady
    • Noah Kimmes
    • David LaPorte
    • Justin McCarley
    • Aleyna Donaldson
    • Michael Bunn
    • Andy Vessely
    • Larry Pierson
    • Derek Cornforth (Founder)
  • Resources
  • Contact Us