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Slope Protection

Terra Aqua gabions and reno mattresses are commonly designed and constructed in a wide variety of configurations to provide long term slope protection solutions. Terra Aqua offers gabion and reno mattress slope protection design solutions that prevents soil erosion and scour, provides bio-engineering opportunities for surface vegetation, and/or stabilizes the slope against lateral earth pressure. The design engineer must consider the existing soil conditions, gradient of slope, applied loads, hydraulic impact, shear, and other factors when choosing the appropriate slope protection solution. As with any Geotechnical solution a complete analysis of the existing slope and soil conditions should be made by a Professional Geotechnical Engineer to obtain an understanding of the slope and soil parameters.

Advantages of Gabion or Reno Mattress Slope Protection

  • Standard design methods
  • Ease of construction
  • Low cost
  • Easily Vegetated
  • Free Draining
  • Flexibility
  • Durability
  • Roughness Coefficient
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Slope Protection Photo 13

Design Considerations

Terra Aqua provides the following recommendation as to which gabion or reno mattress solution shall be implemented based on slope width, gradient of slope and internal angle of friction of the existing soils. The following is a recommendation only and should be analyzed and verified by a Professional Engineer prior to construction of any gabion structure.   

 

A geotextile filter fabric shall always be placed underneath the gabion or reno mattress slope protection to prevent loss of soil during drainage or hydraulic impact.

Mattress Slope Protection

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Slope Angle:

    2h:1v or less
Solution:

    Standard reno or gabion mattress slope protection

Slope width:

    3’-36’
Minimum Soil Requirements of existing slope:
    Required internal friction angle of soil minimum 26 degrees.

Stepped Slope Protection

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Slope Angle:

    1h:1v or less
Solution:

    Stepped gabion slope protection
Slope width:

    No restriction
Minimum Soil Requirements of existing slope:
    Required internal friction angle of soil minimum 33 degrees Select backfill may be required directly behind gabion protection. Earth anchor can also be utilized to resist lateral forces.

Reinforced Slope Protection

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Slope Angle:

    1h:1v, Vertical or any slope angle
Solution:

    Stable Slope System
Minimum Soil Requirements of existing slope:
    Required internal friction angle of soil select fill required see stable slope section for design guidelines