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- 저자 : (Bergado D . T .) (검색결과 2 건)
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D. T. Bergado,M. Nualkliang,P. Voottipruex 한국토목섬유학회 2011 한국토목섬유학회 학술발표회 Vol.2011 No.11
In this study, the K-stiffness method which is used to calculate the reinforcement load of mechanically stabilized earth (MSE) structures on hard foundation was investigated to be applied for reinforced structures. The mechanically stabilized earth wall/embankment was constructed in Phitsanulok Province, Thailand consisting of reinforced backfill with geosynthetics materials made of polymer geogrids and metallic reinforcements. The mechanism of reinforced earth involves the generation of frictional and bearing resistances at the interfaces between the soil and the reinforcement in order to create strong composite materials. This study also presents results of the laboratory large-scale direct shear test investigations on the interactions between soil and the reinforcements. The performances of grids reinforcements consisting of polyester (PET) and steel grids were compared using the K-stiffness method, FHWA method and AASHTO 2002 method. The results show that the K-stiffness method for internal design of polyester (PET) and steel grids of the mechanically stabilized earth (MSE) structures on hard foundation was verified. Consequently, the K-stiffness working stress method can be recommended for revisions of current conservative design method on hard foundation.
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Geosynthetic Applications for Mitigation of Natural Disasters Caused by Climate Change
D. T. Bergado,P. V. Long,Y.P. Lai,S. Piyaboon 한국토목섬유학회 2007 한국지반신소재학회 학술발표회 Vol.2007 No.11
Great attention is directed to rebuild livelihoods and rehabilitate coastal communities affected by the Tsunami in the Indian Ocean in South Asia. From the geotechnical engineering point of view, the natural disasters caused by tsunami is quite similar to the devastating effects of strong storms, typhoons, and hurricanes. Geosynthetics can play important and vital roles in the protection, mitigation and rehabilitation efforts in affected coastal areas. Geosynthetics can be applied for reinforcement, filtration, drainage, protection, lining, and containment. Particularly, geotextiles can be used effectively for erosion protection and for reinforcement of earth embankments to resist failure during the occurrence of earthquakes associated with tsunami. Presented in this paper is the interaction behavior at pullout interfaces of high strength geotextile confined in weathered clay and silty sand. The interface parameters have been successfully interpreted by the newly proposed method considering the softening behavior and non-uniform distribution of shear stress along the extensible reinforcement. Furthermore, the mobilized strain in the geotextile reinforcement at the intersection of the reinforcement and the slip failure surface has been back-analyzed to consist of the critical strain and the localized strain. The critical strain occurred at the onset of plastic deformation of the soft clay foundation. The localized strain, which occurred at the onset of embankment collapse, can be estimated using a new method based on the in-soil stiffness and inclination factors of the reinforcement.
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