Cyclic behavior of bio-cemented soils using relatively large grains

DOI Web Site 参考文献12件
  • Yu Tong
    Laboratoire de mécanique des Sols, Structures et Matériaux, CNRS UMR 8579, Université Paris Saclay, CentraleSupélec, 8-10 Rue Joliot Curie, Gif-sur-Yvette 91190, France
  • Souli Hanène
    Laboratoire de Tribologie et Dynamique des Systèmes, CNRS UMR 5513, Université de Lyon, Ecole Nationale d’Ingénieurs de Saint Etienne, 58 rue Jean Parot, Saint Etienne Cedex 42023, France
  • Pechaud Yoan
    Laboratoire Géomatériaux et Environnement, Université Gustave Eiffel, Marne-la-Vallée Cedex 2 77454, France
  • Fleureau Jean-Marie
    Laboratoire de mécanique des Sols, Structures et Matériaux, CNRS UMR 8579, Université Paris Saclay, CentraleSupélec, 8-10 Rue Joliot Curie, Gif-sur-Yvette 91190, France

抄録

<p>Consequences of liquefaction during earthquakes can be disastrous and fatal. During the past decade, bio-mediated methods have gained researchers and engineers' attention, and have been developed to strengthen soils and mitigate liquefaction. Among these methods, a commonly used method ― the microbial induced calcite precipitation (MICP) method ― has proved to be a potential alternative technique due to its sustainability and relatively environmentally friendly character, with lower carbon emissions compared to traditional methods. In most of the existing studies on cyclic behavior of MICP-treated soils, uniformly graded fine sands like Ottawa 50-70, with a maximum diameter of 1 mm and a narrow grain size distribution, were used. As liquefaction can also occur in soils with larger grain size, it is quite important to study the applicability of MICP method to these soils and to know their behavior after treatment. In this study, we used coarser soils with a maximum grain size of 5 mm. Undrained cyclic triaxial tests were applied to MICP-treated and untreated soils. Cyclic stress ratios (CSR) and number of cycles from 0.25 (300 cycles) to 0.3 (100 cycles), 0.35 (100 cycles), 0.4 (100 cycles), up to 0.5 were applied one after another as long as liquefaction did not occur. The results obtained on one of these soils showed that the untreated soil samples liquefied at a CSR equal to 0.25 after 42 cycles, with an axial deformation around ± 4 %. For the MICP-treated samples with 8.6 % calcium carbonate content, cyclic resistance increased slightly to 63 cycles at 0.25 CSR, while the axial deformation was in one direction and relatively lower rate of increment. With around 3 % more calcium carbonate content (11.5 %), the MICP-treated soil was like cement which could withstand a much higher cyclic stress ratio (up to 0.5) with many more cycles compared to the untreated soil.</p>

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