Long term effect of creep strength for damaged geosynthetics during construction

The design tensile strength of geosynthetics is evaluated by considering creep reduction co-efficient, safety factor of durability and damage during construction.
The damage during construction is the amount of strength lost due to pressure from the compaction roller combined with the characteristics of the fill material. Tunnel slags are sometimes used as fill material and in recent years large-scale compaction rollers have been used for improving construction efficiency. In such a situation, the damage to geosynthetics should be considered.
The geosynthetics used in this case has a high strength parallel laid fiber core encased in a polyethylene sheath.
In order to ascertain the long term effect of creep strength for damaged geosynthetics during construction, the conventional creep rupture test and an accelerated (SIM) creep rupture test were performed in accord-ance with ASTM D 6992.
BS 8006 2010 shows that partial material factor for installation damage during construction should also take in account the long term effects of the short term damage.
This paper describes the long term effect of creep strength for damaged geosynthetics during construc-tion.