Geosynthetics

About: Geosynthetics is a research topic. Over the lifetime, 2384 publications have been published within this topic receiving 32434 citations.

Designing with Geosynthetics

Abstract: (NOTE: Each chapter begins with an Introduction and concludes with References and Problems) 1 Overview of Geosynthetics 2 Designing with Geotextiles 3 Designing with Geogrids 4 Designing with Geonets 5 Designing with Geomembranes 6 Geosynthetic Clay Liners 7 Designing with Geopipes 8 Designing with Geofoam 9 Designing with Geocomposites Index

Numerical Analysis of Geosynthetic-Reinforced and Pile-Supported Earth Platforms over Soft Soil

Abstract: Geotechnical engineers face several challenges when designing structures over soft soils. These include potential bearing failure, intolerable settlement, large lateral pressures and movement, and global or local instability. Geosynthetic-reinforced and pile- supported earth platforms provide an economic and effective solution for embankments, retaining walls, and storage tanks, etc. con- structed on soft soils; especially when rapid construction and/or strict deformation of the structure are required. The inclusion of geosynthetic~s! in the fill enhances the efficiency of load transfer, minimizes yielding of the soil above the pile head, and potentially reduces total and differential settlements. A numerical study has been conducted to investigate pile-soil-geosynthetic ~s! interactions by considering three major influence factors: the height of the fill, the tensile stiffness of geosynthetic, and the elastic modulus of pile material. While current methods have not fully addressed important effects of the geosynthetic stiffness and pile modulus on the soil arching ratio, numerical results suggested that the stress concentration ratio and the maximum tension in geosynthetic increase with the height of the embankment fill, the tensile stiffness of geosynthetic, and the elastic modulus of the pile material. The distribution of tension force in the geosynthetic reinforcement indicated that the maximum tension occurs near the edge of the pile.

Large model spread footing load tests on geosynthetic reinforced soil foundations

Abstract: The potential benefits of geosynthetic reinforced soil foundations are investigated using large-scale model footing load tests. A total of 34 load tests were performed to evaluate the effects of single and multiple layers of geosynthetic reinforcement placed below shallow spread footings. Two different geosynthetics are evaluated: a stiff biaxial geogrid and a geocell. Parameters of the testing program include the number of reinforcement layers, spacing between reinforcement layers, the depth to the first reinforcement layer, plan area of the reinforcement, the type of reinforcement, and soil density. Test results indicate that the use of geosynthetic reinforced soil foundations may increase the ultimate bearing capacity of shallow spread footings by a factor of 2.5.

Shredded Tires and Rubber-Sand as Lightweight Backfill

Abstract: The growing interest in utilizing waste materials in civil engineering applications has opened the possibility of constructing reinforced soil structures with unconventional backfills. Scrap tires are a high-profile waste material for which several uses have been studied, including the use of shredded tires as backfill. A triaxial testing program was conducted to investigate the stress-strain relationship and strength of tire chips and a mixture of sand and tire chips. The test results and additional information from the literature were used in the numerical modeling of wall backfills, both unreinforced and reinforced with geosynthetics. The numerical modeling results suggest tire shreds, particularly when mixed with sand, may be effectively used as backfill.

Arching in Piled Embankments

Abstract: Model tests and theoretical analysis were done to investigate the arching in embankments on soft ground supported by piles with cap beams and geotextiles The cap-beam–and–geotextile combination may alleviate the uneven surface settlements that sometimes occur in embankments supported by piles with individual square caps In the model tests, sand was placed on simulated cap beams and soft ground The loads on the cap beams and soft ground were recorded and compared with theoretical analysis based on equilibrium of semicylindrical sand arches In a second series of model tests, a geotextile layer was laid on the cap beams and the soft ground prior to placement of sand Equations and charts were developed to show the parameters affecting the tension in the geotextile and to assess the effect of geotextile on load transfer Theoretical solution showed reasonable agreement with experimental results for cases with no geotextile but only partial agreement for cases with geotextile The limitations of the model tests, the factors affecting the results, and alternative interpretations are discussed