Puncture protection design and cushion geotextile selection

5 Puncture protection design and cushion geotextile selection 

Not many analytical methods are available for evaluating geomembrane puncture. The most well-known method, by Giroud et al. (1995), is applicable only to geomembrane puncture because it does not address the selection of a protection geotextile. One of several relationships presented in this method is given in Eq. [17.1]  

Fp = geomembrane puncture force (N), foMs = thickness of a geomembrane in contact with a stone (m), tcMp = thickness of geomembrane in contact with a test probe (m), and = strain function. 

Dividing pallow by Pdesign (site overburden pressure) results in an overall factor of safety against puncture. In this equation, paiiow = allowable pressure (kPa), M = mass 

Therefore, there seems to be an error in deriving this equation as this value is off by several orders of magnitude. 

---