Bentonite Cutoff Anchorage

February 1st, 2024

Q: I have a bentonite cutoff wall containing a positive pressure inside and an overfill situation where the waste being capped will have perched water in the waste mass above the perimeter elevation. Do you have a recommendation for the perimeter connection detail for such a situation? A: We generally use an anchor trench beyond […]

Read More

Five major considerations when designing geomembrane mechanical attachments

September 18th, 2023

By Felon Wilson The terms attachments, penetrations and terminations are often considered synonymous, or at least in the same family, when used in the context of geomembranes. This post will focus on attachments and specifically a review of ASTM D6497, one of the main guides for geomembrane mechanical attachments. ASTM D6497 (General Practices for Geomembrane […]

Read More

Connection strength of geosynthetics anchored in concrete

February 1st, 2023

FIGURE 1 Photographs of various styles of embedment liners Nearly all geomembrane installations are fixed at the perimeter of the containment by burying the liner in an anchor trench or by attaching it to concrete (i.e., a collar wall, foundation, ring wall, manhole, vault, etc.). The standard approach for connecting the geomembrane liner to concrete […]

Read More

Pipe penetrations through geomembranes

June 1st, 2022

Q: Is there a recommended detail that you can provide or point me toward for pipe penetrations through geomembrane single and double liners? A: You should review American Society for Testing and Materials (ASTM) D6497 Standard Guide for Mechanical Attachment of Geomembranes to Penetrations or Structures. It is excellent, with three tried-and-true standard details that […]

Read More