Lab Scale Studies on Pore Clogging Nature of Flyash Mixed Soil With Various Geotextiles- A Study on Soils from Dindigul District

Geotextiles are increasingly being used in transportation applications due their ease of construction and economy over traditional methods. Geotextiles are often used in embankment constructions; their two most important roles being the reinforcement of the foundation and separation of the embankment fill from the foundation soil. In addition to these roles, geotextiles provide lateral drainage of percolation water and prevent the build up of excess pore water pressure. The current design of GC drains and geotextile drains is primarily dependent on their flow rate capacities. However, the hydraulic compatibility of a geotextile with the contact soil is an important issue and should be considered in design procedures. This compatibility is usually analyzed through laboratory soil filtration tests. The first main requirement for ensuring this hydraulic compatibility is that the drain should not be clogged throughout the life of the structure. The second requirement is that the soil piped through the geotextile should be minimal, so that the internal stability and modulus of the soil are not adversely affected. reported excessive clogging of GC drains in two different projects. The drain was completely clogged due to accumulation of soil fines at the surface and inside the geotextile (blinding and clogging phenomenon, respectively), resulting in excess pore water pressure buildup under the pavement. Similar problems, excessive clogging of geotextile component of GC drains with fine grained soils, were also reported by. These failures indicate that the hydraulic compatibility of contact soil with the geotextile component of a drain is an important issue, requiring consideration during pavement drainage system design. The problem of fine particle clogging becomes more cumbersome when industrial byproducts are in contact with geotextiles in pavement drainage systems. The nature of these geomaterials is different than regular soils, often consisting of significant amounts of fines. The existing geotextile selection criteria may not be directly applicable to these materials and, in most cases, their filtration or drainage performance with geotextiles should be investigated by conducting laboratory tests. In this study Geosynthetics was tested with varying fly ash content with soil samples taken from Dindigul district and their hydraulic conductivity is measured to check the viability of using Geosynthetics for highways project carrying clayeysoils.