Reinforced Earth Structure Installation

Service: PT Geostructure Dynamics give you solution for surface sloughing and erosion at the edges of the slope problem.

Even if foundation conditions are satisfactory, the unreinforced slopes may be unstable at the desired slope angle. Additionally, surface sloughing and erosion can occur at the edges of the slope.

For new construction, the cost of fill, right-of-way, and other consideration may make a steeper slope desirable.

Geosynthetic layer has been provided in the granular fill layer and has been considered as extensible. This extensible nature has been incorporated with the help of no slip and the compatibility conditions at the interface between reinforcing layer and the neighboring soil. These conditions help in eliminating the two interfacial shear stress parameters and in considering the tensile modulus of geosynthetic layer in the analysis. Performance benefits of material is increases the safety factor of marginally stable slopes, allows the use of less select in-situ soils as fill, reduces the amount of fill material and land required and hence the cost. This construction allows of wider roads, without increasing necessary right-of-way, by replacing gentle slopes with reinforced, steep slopes. And the other benefit is allows the construction of vertical soil structures.

Areas of Application i.e. reinforced soil walls and slopes, road embankment, widening of existing road embankment, bridge approach and abutments, repair of failed slopes.

The Sequence of Reinforced Earth Structure Installation:

The sequence of reinforced earth structure installation will be as directed by the Project Engineer and/or specifications in conjunction with all “as-built” drawings and logs. Reinforced earth structure construction  will go to maximum allowable or until refusal as defined in the specs and logs.

Method of Reinforced Earth Structure Installation:

  1. Preparation

    • Site Clearing

      The site shall be excavated to the grade as shown on the plans. Stones, woods or other sharp objects shall be removed from the site as a prevented tearing damage of geotextile.

      The excavated areas shall be carefully inspected. Any unsuitable foundation soils shall be compacted or excavated and replaced with compacted select backfill material. Foundation soil at the base of the wall excavation shall be proof-rolled with vibratory or rubber tired roller.

    • Formwork

      The formwork can use wood, sand bag, steel or combination both of them.

    • Material

      Geotextile material shall be prepared at a place where is protected from sun-light, even though the geotextile has been given UV-stabilization.  This manner is needed, if the geotextile will be exposed during long time under the sun-light. This is usually to enhance time using of the geotextile.

      The fill material shall fulfil the requirement properties as shown on drawing plan or design.

  2. Installation Procedure

    • Installation  of  Form Work

      Place the formwork at front side of retaining wall. In order to be stronger, the formwork can be supported by wooden piles, therefore the formwork is not pushed out during compaction.

    • Laying of Geotextile

      The geotextile shall be placed with the principal strength (machine) direction  perpendicular to formwork. It shall be secured in place and stretched to prevent movement and wrinkle during fill placement.

    • Filling  and  Compaction  Work

      The backfill material shall be placed over the geotextile with a compacted lift thickness of 200 mm or as determined by the engineer. The construction equipment (roller, dozer, truck, etc) is not allowed to pass directly upon geotextile.

      Then the backfill material is compacted to at least 90% of standard proctor maximum density or below the optimum moisture.
      When placing and compacting the backfill material, care shall be taken to avoid any folding or movement of the geotextile.

      Back Filling Process


    • Layer  Closing  up on Geotextile

      After filling and compaction have finished where the thickness of one geotextile layer has been reached, the loose end of the geotextile is folded back and sewn.  And then the upper side of geotextile, is filled and compacted.  After that, the next layer of geotextile is laid again and steps are repeated, until reaching the designed high.

      Back Filling after Closing up the Geotextile

    • Pullout  of  the  Formwork

      The bottom formwork can be pullout after the third layer is reached, and shall be done carefully, so will not cause tear of geotextile material.

  3. Finishing

    To prevent the geotextile at front of retaining wall from unexpected damage, it is necessary covered by concrete facing or vegetation.
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