landfilldesign.com
Loading:Access Ramp - Design Calculator
This calculator evaluates whether the wheel load on the access ramp will damages the geomembrane.
The Factor of Safety (FS) is given as follows:
with advised minimum Factor of Safety of 3 @ 10% penetration.
Estimation of the field contact stress (σ contact):
Effective radius of the tire contact is defined as:
| σcontact | Contact stress (kN/m2) |
| σtire | Tire pressure (kN/m2) |
| R | Effective radius (m) |
| t | Ramp thickness (m) |
| P | Load per wheel (kN) |
Estimation of compressive strength at 10% deflection (σ pen):
From an in-situ test with representative boundaries we can determine the compressive strength as shown in the chart below showing deflection versus compressive stress.
If no in-situ test is available, or when the liner system follows the contours of the ramp, the use of a geotextile is recommended to reinforce the ramp and protect the geomembrane (Geomembrane puncture protection)
G. N. Richardson and R. M. Koerner, "Geosynthetic Design Guidance for Hazardous Waste Landfill Cells and Surface Impoundments", 1987.
Copyright 2001 Advanced Geotech Systems. All rights reserved.