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Potential Use of Geotechnical Fabric in Airfield Runway Design

T. Allan HaliburtonJohn K. KingJack D. Lawmaster

出版	Oklahoma State University, School of Civil Engineering, 1980
URL	http://books.google.com.hk/books?id=xOtU9_8Sgc4C&hl=&source=gbs_api

註釋A state-of-the-art literature review and laboratory experimental study of the mechanisms of geotechnical fabric separation and lateral restraint reinforcement were performed. Fabrics of dissimilar physical properties were evaluated for use in lateral restraint reinforcement of a cohensionless soil mass. Though considerable increases in strength and load-deformation modulus were obtained for the fabric-reinforced soil systems, no significant difference in behavior was noted among the four fabrics tested, despite wide variations in their physical properties. Fabric prestressing had little effect on behavior. Lateral restraint reinforcement occurred as a result of fabric interference with development of zones of radial shear, underneath and adjacent to the loaded area. The effect is to produce horizontal restraint and confinement, which increases the applied soil stress necessary to develop plastic equilibrium and increases the initial deformation modulus and ultimate load capacity of the system. Lateral confinement induces initial elasto-plastic behavior of the reinforced mass which approximates the classic general shear failure conditions postulated by Terzaghi. An optimum depth of placement for fabric was determined which provides maximum deformation modulus and initial strength and minimizes soil yielding necessary to develop strain hardening effects. The optimum depth is related to the width of the loaded contact area and frictional properties of the reinforced soil. (Author).