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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.
Nagoya Institute of Technology, Japan Hohai University, Nanjing, China
Preface1 Why do we study soilbags now?2 How to achieve earth reinforcement with soilbags (Solpack method)?3 Characteristics of soilbags3.1 Compressive strength and anisotropy3.1.1 Compressive strength in the case of ? = 03.1.2 Strength anisotropy in the case of ? ? ? 03.2 Vibration reduction3.2.1 Laboratory cyclic simple shear tests3.2.2 Laboratory vibration tests3.2.3 In situ vibration tests3.2.4 Case history study3.2.5 Quake-absorbing structures3.3 Frost heave prevention3.4 Tensile strength3.5 Failure criterion3.6 Deformation3.6.1 Deformation estimation when soilbags are subjected to major principal stress along the short axis of soilbags (? = 0)3.6.2 Deformation estimation when soilbags are subjected to major principal stress with an inclination to the short axis of soilbags (? ? ? 0)3.7 Friction between soilbags4 Design approaches of the Solpack method4.1 Embankment constructed with soilbags4.2 Reinforcement of soft ground with soilbags4.3 Retaining walls built with soilbags5 Applications of the Solpack method5.1 Railway ballast foundations5.1.1 Verification through laboratory experiments5.1.2 Applications to a local Japanese Railway5.2 Soft foundation reinforcement5.2.1 In YC cho, Ibaraki Prefecture5.2.2 In FS-cho, Ibaraki Prefecture5.2.3 In MB city, Chiba Prefecture5.2.4 In KR-cho, Chiba Prefecture5.2.5 In S City, Miyagi Prefecture5.2.6 In TK city, Hokkaido5.2.7 In OT city, Hokkaido5.2.8 In ST city, Osaka5.2.9 Reinforcement for elevator foundation in K city, Kyoto5.3 Soilbag piles5.3.1 Principle of soilbag piles5.3.2 Applications of soilbag piles5.4 Retaining wall5.4.1 Restoration of a sliding slope in Fukuoka Prefecture5.4.2 Retaining wall in NO city, Aichi Prefecture5.4.3 Retaining wall in MS city, Shizuoka Prefecture5.4.4 Restoration works in Miyake Island, Japan5.5 Tunnel lining5.5.1 Loading tests on an arch structure model constructed with soilbags5.5.2 Construction of a trial arch structure6 Natural vegetations planted in soilbags6.1 Growth of native vegetation cuttings in soilbags6.2 Spontaneous germination of vegetation seeds in soilbags filled with slope mantle soils7 Concluding remarksReferences
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- ID: 9780415383547
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