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Performance of a Nonwoven Geotextile Reinforced Wall with Unsaturated Fine Backfill Soil

Journal of Civil Engineering and Architecture 2013年第10期7卷 1253-1259页

作者： femando henrique martins portelinha Benedito de Souza Bueno Jorge Gabriel Zomberg Department of Civil Engineering Federal University of Sao Carlos Sao Carlos/SP 13564-350 Brazil Sao Carlos Engineering School University of Sao Paulo Sao Carlos/SP 13566-536 Brazil Civil Engineering Department University of Texas at Austin Austin/TX 78712-0280 USA

The use of marginal backfills in GSE (geosynthetic stabilized earth) walls has not been recommended by different standards specifications. Restrictions are motivated by the poor hydraulic conductivity of fine soils that are capable of developing of water pressures. However, the use of granular materials can expend the cost of the construction. As a result, local soils, granular or not, have been increasingly used. Unsaturated conditions of fine soils may result in convenient performance even using extensible reinforcements. This paper evaluates the performance of a full scale model of a nonwoven geotextile reinforced wall constructed with fine grained soil backfill. The unsaturated condition was maintained and matric suctions, displacements and reinforcement strains were monitored during the test. Results have shown that the unsaturated condition of the backfill allowed maximum reinforcement peak strain of 0.4 %. For the case of a wrap faced wall on a firm foundation the performance and good agreement between measured strains and factors of safety from limit equilibrium analyses have shown the maintenance of unsaturated conditions as an economical alternative to the use of high quality fill.

关键词：土工合成材料非织造土工布不饱和性能回填墙面颗粒状物料加筋

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