E3S Web Conf.
Volume 195, 20204th European Conference on Unsaturated Soils (E-UNSAT 2020)
|Number of page(s)||6|
|Section||Special Session on Biocementation|
|Published online||16 October 2020|
BOREAL, Bio-reinforcement of embankments by biocalcification
1 Soletanche Bachy, 280 avenue Napoléon Bonaparte, 92300 Rueil Malmaison, France
2 Compagnie Nationale du Rhône, DCOS CACOH, 4 rue de Chalons sur Saône, 69007 Lyon, France
3 EDF CIH, Savoie Technolac, 73370 Le Bourget du Lac, France
4 GeophyConsult, 159 Quai des Allobroges, 73000 Chambéry, France
5 Enoveo, 7 Place Antonin Poncet, 69002 Lyon, France
6 Univ. Grenoble Alpes, CNRS Grenoble INP, IGE, 38000 Grenoble, France
7 Univ. Grenoble Alpes, CNRS Grenoble INP, 3SR, 38000 Grenoble, France
8 Laboratoire de Microbiogéologie UFR Sciences, Université d’Angers 2, Boulevard Lavoisier, 49045 ANGERS cedex, France
* Corresponding author: email@example.com
Biocalcification is a recent in-situ soil consolidation solution. It is obtained by calcite precipitation under controlled biogeochemical conditions. The industrial process, for whose implementation Soletanche Bachy holds several patents, has been validated by several experiments, initially on laboratory scale and later in situ on industrial scale under static groundwater conditions. However, it was necessary to adjust the process to make it effective for use in embankments due to the potentially high ground water flows that may be present. This is one of the main aspects addressed by the BOREAL project (Bio-reinforcement of backfilled hydraulic structures), a 4-year research and development program. Injection tests performed on a 1:1 scale in a physical model allowed for the validation of the process’ feasibility in various soil types and configurations as well as under several hydraulic flow conditions. The prime objective of the process is to help mitigate erosion and liquefaction risks. The project’s results are applicable to saturated and non-saturated soils. The areas of application of the process and its objectives in terms of treatment are also discussed in the article.
© The Authors, published by EDP Sciences 2020
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