Geotextile

About: Geotextile is a research topic. Over the lifetime, 3243 publications have been published within this topic receiving 30449 citations. The topic is also known as: geo-textile.

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.

Geotextile-Reinforced Unpaved Road Design

Abstract: By providing reinforcement, geotextiles improve the performance of unpaved roads, and for a given traffic, the thickness of the aggregate layer can be reduced. This paper explores the mechanism of geotextile reinforcement of roadways, and a method is developed which enables the engineer to calculate the required thickness of aggregate layer and make a proper selection of the geotextile to be used. Charts are presented to assist in the design of geotextile-reinforced unpaved roads and to evaluate the reduction of aggregate thickness resulting from the use of a geotextile. Practical examples and comparisons with full scale tests are presented.

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

Design Method for Geogrid-Reinforced Unpaved Roads. I. Development of Design Method

Abstract: A theoretically based design method for the thickness of the base course of unpaved roads is developed in this paper, which considers distribution of stress, strength of base course material, interlock between geosynthetic and base course material, and geosynthetic stiffness in addition to the conditions considered in earlier methods: traffic volume, wheel loads, tire pressure, subgrade strength, rut depth, and influence of the presence of a reinforcing geosynthetic (geotextile or geogrid) on the failure mode of the unpaved road or area. In this method, the required base course thickness for a reinforced unpaved road is calculated using a unique equation, whereas more than one equation was needed with earlier methods. This design method was developed for geogrid-reinforced unpaved roads. However, it can be used for geotextile-reinforced unpaved roads and for unreinforced roads with appropriate values of relevant parameters. The calibration of this design method using data from field wheel load tests and laboratory cyclic plate loading tests on unreinforced and reinforced base courses is presented in the companion paper by the authors.