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Pullout behavior of geosynthetic reinforcement in biocemented soils
Abstract The pullout resistance of a geosynthetic reinforcement is crucial for the design of reinforced soil structures. In this paper, an innovative concept, biocementation-geosynthetic (BG) system is presented, in which biocementation is used in combination with geosynthetic to increase the pullout resistance of the geosynthetic reinforcement. A series of pullout tests were conducted in laboratory to obtain the pullout behavior of the biocementation-geosynthetic system. From the pullout test results, it was found that the BG system was more efficient in enhancing the pullout resistant as compared with the ordinary geosynthetic (OG) system. For both geosynthetic strips and biaxial geogrid, the BG system had a higher pullout resistance at various levels of relative density. The BG system with only about 0.65% calcite produced by the biocementation process has a 13%–38% improvement in the pullout resistance compared to the OG system. In addition, the interface shear strength parameters (the adhesion c a and average interface friction angle ϕ) of the BG system are also higher than that of the corresponding OG system in most cases, indicating the better interface performance of the BG system.
Highlights In this work, an innovative concept of a biocementation-geosynthetic (BG) system is presented, which combines biocementation with geosynthetics. In the BG system, the biocementation was applied to improve the interface shear strength between geosynthetic and the surrounding soil, which directly leads to the increase of pullout resistance and soil-reinforcement interaction, thus improving the mechanical behavior of reinforced soil structures. It is expected that the BG system can provide a beneficial alternative reinforcement system, particularly when the site is inconvenient for compaction or is not large enough to incorporate longer reinforcements in the construction of reinforced soil structures.
Pullout behavior of geosynthetic reinforcement in biocemented soils
Abstract The pullout resistance of a geosynthetic reinforcement is crucial for the design of reinforced soil structures. In this paper, an innovative concept, biocementation-geosynthetic (BG) system is presented, in which biocementation is used in combination with geosynthetic to increase the pullout resistance of the geosynthetic reinforcement. A series of pullout tests were conducted in laboratory to obtain the pullout behavior of the biocementation-geosynthetic system. From the pullout test results, it was found that the BG system was more efficient in enhancing the pullout resistant as compared with the ordinary geosynthetic (OG) system. For both geosynthetic strips and biaxial geogrid, the BG system had a higher pullout resistance at various levels of relative density. The BG system with only about 0.65% calcite produced by the biocementation process has a 13%–38% improvement in the pullout resistance compared to the OG system. In addition, the interface shear strength parameters (the adhesion c a and average interface friction angle ϕ) of the BG system are also higher than that of the corresponding OG system in most cases, indicating the better interface performance of the BG system.
Highlights In this work, an innovative concept of a biocementation-geosynthetic (BG) system is presented, which combines biocementation with geosynthetics. In the BG system, the biocementation was applied to improve the interface shear strength between geosynthetic and the surrounding soil, which directly leads to the increase of pullout resistance and soil-reinforcement interaction, thus improving the mechanical behavior of reinforced soil structures. It is expected that the BG system can provide a beneficial alternative reinforcement system, particularly when the site is inconvenient for compaction or is not large enough to incorporate longer reinforcements in the construction of reinforced soil structures.
Pullout behavior of geosynthetic reinforcement in biocemented soils
Gao, YuFeng (Autor:in) / Hang, Lei (Autor:in) / He, Jia (Autor:in) / Zhang, Fei (Autor:in) / Van Paassen, Leon (Autor:in)
Geotextiles and Geomembranes ; 49 ; 646-656
26.10.2020
11 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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