ANS: Application of geotextiles 1) Road works :The fabric are used to provide tensile strength in the earth mass in location where shear stresses would be generated . 2) Railway works:The woven fabrics or non-wovens are used to separate the soil from the sub-soil without impeding the ground water circulation where ground is unstable 3) River canal :Geotextiles protect river banks from erosion due to currents or lapping. When used in conjunction with natural or artificial enrockments, they act as a filter 4) Drainage :The use of geotextiles to filter the soil and a more or less single size granular material to transport water is increasingly seen as a technically and commercially viable alternative to the conventional systems.

Geogrids in road and airfield: The three primary uses of a geogrid in pavement system are to (a) serve as a construction aid over soft subgrades (b) improve or extend the pavements projected service life c) reduce the structural cross section for given service life

Reinforcement Mechanisms :the use of geogrid to reinforce pavement materials (a) lateral restraint b) improved bearing capacity