A Method of Evaluating Geomembrane Strain Caused by Point Loading from Aggregates

This paper describes the test device and performance test methodology for measuring and evaluating geomembrane strain for large gravel or tire derived aggregate (TDA). The primary purpose of evaluating geomembrane strain is for determining the adequate protection layers required in long-term waste facilities. The procedure has many advantages over previous versions, such as removal of the lead impression sheet, elimination of operator bias, and a defined method of calculation. A photogrammetry procedure is described in detail as an alternative to laser scanners. An example of a typical comparison between different protection layers is provided for a TDA sample.