drain envelopes play significant roles in the performance of drainage systems due to theirreduction in letting sediments into the drainpipes and also because of an increase in thehydraulic conductivity of soil around the drainpipes. throughout the present research, theeffect of a one 1000 hour flow on dual envelopes consisting of geotextile as a means ofimproving the hydraulic gradient and rice...

The permeability of sand covered with geotextile is affected by the geotextile, which related to tensile state geotextile. Considering weaving mode effects warp tension and weft on were studied experiment. Four different specifications geotextiles selected for respectively. changes parameters under non tension, measured vertical instrument, such as seepage velocity, loss gradient ratio analyzed...

Accurate predictions of the amount and the rate of long- term deformation of reinforced soils under an applied load are important key issue in geotechnical engineering, in which the deformation of soil develops with time at a state of constant effective stress. Since geosynthetic is generally considered creep sensitive therefore, evaluation of creep behavior of geosynthetic reinforced soil (GRS...

in this research, failure mechanism, soil deformation and effect of reinforcement below a strip foundation were studied using physical modeling and piv method. for this purpose, a comprehensive set of tests were undertaken on dense and loose sands and different geosynthetic materials such as geotextile and geogrid for soil reinforcing. in each step of loading, digital image of deformed soil was...

One of the methods for the improvement of soil against the tensile stresses is using the artificial supplements in soil such as metal belts or nets, polymer materials and natural fibers. Technically this method is called the reinforced of soil.  When a pavement is located on soft soil, great deformations can occur as a result of the crossing of traffic load in superstructure layers of the body....

Impact tests of stones on a geotextile or two loosely connected geotextiles (composites) have been performed and analysed to investigate the mechanisms that lead perforation. The were mounted concrete cylinder 0.8 m internal diameter, filled with uniformly graded dry sand. Drop blocks different shapes weighing approximately 40 kg. drop heights varied between 0.25 5.5 m. Results show shape stone...

Filtration performance of geotextiles strongly depends on their pore structure parameters, i.e. percent open area (POA), pore opening size distribution (PSD) and constriction size distribution (CSD). Current methods of determination of pore structure parameters contain inherent disadvantages whereas image analysis can be used effectively for this purpose. Two new image-based PSD and CSD determi...

Geotextile layers are arranged on and below the geomembrane to prevent from being punctured damaged. The geotextile not only plays a role in physical protection, like anti-puncture but also makes great difference mechanical properties of geomembrane’s air expansion deformation. In this paper, bulging deformation is simplified as spherical under ring-restrained conditions. Using special test equ...