Soilbags are usually incorporated into temporary structures, rather than being used in conventional construction, as they have a tendency to deteriorate rapidly on prolonged exposure to sunlight. The amazing bearing capacity of soilbags has, however, inspired the development of an earth reinforcement method in which the bearing capacity of soft foundations is enhanced, reaching ten per cent of that of concrete. New methods have seen their projected durability as a semi-permanent material extend to in excess of fifty years, provided that direct exposure to sunlight and ultra-violet rays is avoided. This book covers the development, properties and characteristics of soilbags, as well as design features of structures built by this method. The geotechnical applications in, for example, railway ballast foundation reinforcement, retaining walls and embankment constructions are extensively described and richly illustrated by reference to case studies from Japan. The intention is to stimulate a wider, international adoption of the method in earth reinforcement and civil engineering construction, with particular reference to developing countries. Geotechnical and foundation engineers and other professionals working on earth reinforcement will find this a valuable work, while it will provide supplementary information to graduate students in soil mechanics and foundation engineering.

The Cam-Clay model is a fundamental constitutive model in soil mechanics, but is only suitable for normally consolidated clay under triaxial compression stress states. The SMP failure criterion is the most reasonable three-dimensional extension of the Mohr-Coulomb failure criterion from the point of view of its physical meaning, mathematical expression and geometrical presentation. To integrate the Cam-Clay model with the SMP criterion and extend it to sand and other geomaterials is one of the fundamental tasks in geotechnical engineering. This book introduces the SMP criterion, the integration of the SMP criterion with the well-known Cam-clay model, and the application of the SMP criterion to the general elastoplastic constitutive models for geomaterials like clay, sand and unsaturated soil. In addition to the theoretical development of constitutive models, the book is full of high-quality experimental data obtained from conventional and true triaxial tests on various soils. The scope and the level of the book ensure that it will be a valuable resource for postgraduate students, academics and geotechnical engineering professionals alike

Soilbags, Donow in Japanese, have been commonly used as temporary structures, rather than as real earth reinforcement construction parts, because of their rapid deterioration on prolonged exposure to sunlight. The amazing bearing capacity of soilbags has, however, initiated the development of a novel and effective earth reinforcement method in which the bearing capacity of soft foundations can be greatly improved. The bearing load of quality-controlled soilbags can reach 10% of that of concrete, and their durability as a semi-permanent material can exceed 50 years, provided that direct exposure to sunlight and ultra-violet rays is avoided. A New Earth Reinforcement Method Using Soilbags covers the development, properties and characteristics of soilbags, as well as design features of structures built with soilbags. The geotechnical applications of this method in railway ballast foundation reinforcement, soft building foundation reinforcement and retaining wall and embankment constructions are extensively described and richly illustrated by reference to case studies from Japan. the method in earth reinforcement and civil engineering construction in other countries. Developing countries may have particular interest in the soilbag method as an effective and economical alternative for conventional earth reinforcement techniques. This volume is intended for geotechnical and foundation engineers and other professionals working on earth reinforcement. It may serve as a supplementary information source on earth reinforcement for graduate students in soil mechanics and foundation engineering.