Geomembrane Installation

Service: PT. Geostructure Dynamics give you solution for Geomembrane Installation. Application at geomembrane installation i/e :

  • Sanitary and industrial waste landfills
  • Industrial water treatment pond
  • Waste water
  • Heap leach pad
  • Artificial and decorative ponds
  • Storage tank and secondary containment
  • Water content control in expansive soil
  • Fire water pond
  • Lake contour lining
  • Agricultural reservoir
  • Construction lining
  • Tunneling
  • Irrigation and drainage canals
  • Aquaculture lining
  • Floating covers

Geomembranes are a kind of geosynthetic material. They are impermeable membranes used widely as cut-offs and liners. Until recent years, geomembranes were used mostly as canal and pond liners.

One of the largest current applications is at landfill sites for the containment of hazardous or municipal wastes and their leachates. In many of these applications geomembranes are employed with geotextile or mesh underliners which reinforce or protect the more flexible geomembrane whilst also acting as an escape route for gases and leachates generated in certain wastes.

Geomembranes are made of various materials. Some common geomembrane materials are EPDM rubber (ethylene propylene diene Monomer), Low-Density Polyethylene (LDPE), High-Density Polyethylene (HDPE), Polyvinyl Chloride (PVC), Polyurea and Polypropylene (PP). Another type of geomembrane is bituminous geomembrane (such as Teranap), which is made up of a non-woven polyester geotextile and glass fleece, impregnated in SBS modified bitumen.

Geomembrane products are engineered to help provide cost-effective solutions and to meet specific design requirements in fluid barrier, containment and other geotechnical applications.

The Sequence of Geomembrane Installation:

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

Method of Geomembrane Installation:

  1. Earthwork

    • Surface Preparation

      The surface to be lined has been prepared so as to be free of irregularities, protrusions, vegetation, excessive water, loose soil or abrupt changes in grade. The supporting surface does not contain stone or other matter of such composition, shape or size which may be damaging to the geomembrane. There are no excessively soft surface areas.

      Under no circumstances shall the installer deploy any geomembrane in areas not acceptable within these guidelines . A completed surface acceptance form shall be provided to the customer specifically indicating the areas accepted for geomembrane installation during each day’s activities. This form shall be provided after installation activities within that area. If at any time during the installation of the geosynthetic lining system the prepared sub-grade deteriorates, becomes damaged, or in any way is determined unacceptable by the Site Supervisor, all liner installation work shall stop in those areas and the condition of those areas brought to the attention of the appropriate party.

    • Anchor Trench

      The Anchor trench shall be constructed by the Earthwork Contractor (unless otherwise specified in the contract) to the lines, widths and depths as shown on the drawings and specifications. This task should be performed prior to the geomembrane deployment.

      The edges where the geosynthetics enter the trench should be free of irregularities, protrusions, etc. to avoid potential damage to the material. Backfilling of the anchor trench shall be the responsibility of the Earthwork Contractor in accordance with specifications. Backfilling should occur when the geosynthetic material is at its most contracted state to avoid damaging the geosynthetics during backfilling.

  2. Geomembrane Deployment

    Deployment provided that i.e. deployment equipment does not damage the subgrade.

    Field panel placement installation sequence should take into account site drainage, wind direction, subgrade surface, access to the site, and production schedule of the project. Geomembrane panel deployment shall not proceed when adverse weather conditions exist which may jeopardize the integrity of the liner installation. Field panels should be seamed as soon as possible after deployment and all deployed material shall be marked with appropriate identification.

  3. Field Seaming

    Field seaming involves the bonding of adjacent panels using thermal methods. In general, seams shall be oriented parallel to the direction of maximum slope, i.e. oriented along, not across, the slope. In corners and odd-shaped geometric locations, the number of seams should be minimized. No horizontal seams should occur on a panel less than one meter and fifty five centimeter from the toe of the slope. On slopes of less than 10 % (6L : 1H), this rule shall not apply. A cross slope seam may be utilized provided the panel ends are cut at an angle of approximately 45°.

    A seam is considered a separate entity if it is the principal attachment that joints two or more panels. Repairs are not considered seams in this context.

    A numbering system using adjacent panel numbers shall identify each seam.

    Liner installation can proceed in any temperature where it can be demonstrated by qualification weld that welding criteria can be met. Do not install in the presence of winds above < [20] kph> << [12] mph>> or in weather conditions that may be detrimental to function of the cover. Do not weld membrane during precipitation or in the presence of excessive moisture or when conditions may affect the safety of the installation.
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Kompleks Roxy Mas Blok C5 No. 2
Jl. K.H. Hasyim Ashari 125
Jakarta 10150, Indonesian
Phones : +62 (021) 6304403
+62 (021) 6304453
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Email : office@geostructure.co.id