Microbial Changes of the Earth Dam Mechanical Properties and the Improvement of Them

Demenev, A.D.; Maksimovich, N.G.; Khmurchik, V.T.; Sedinin, A.M.

Авторы: Demenev Artem D., Maksimovich Nikolay G., Khmurchik Vadim T., Sedinin Aleksey M.
Сборник: IAEG/AEG Annual Meeting Proceedings, San Francisco, California, 2018 - Volume 4
Том: 4
Год издания: 2018
Место издания: Springer International Publishing
Первая страница: 41
Последняя страница: 45
DOI: 10.1007/978-3-319-93133-3_6
Аннотация: Earth dams are subject to raised liability because changes of their planned engineering and geological indices could lead to weakening or failure of the dam. Microbial processes are a significant but insufficiently studied factor affecting rock/soil properties. When large quantities of water-dissolved organic substances enter an earth dam, the increased activity of soil’s microorganisms is able to cause a number of negative effects. We studied one of the largest earth dams in Perm region (Russian Federation) using a complex of field survey techniques. Some signatures of suffosion process were observed during field examination of the dam. Extensive laboratory investigations were carried out and the reasons of observed phenomena were determined. The study of microbial processes influence on dam’s soil showed that its deformation modulus changed by a factor of two and more in some circumstances. Such changes of soil properties should be taken into account at planning stage of dam construction. Up-to-date microbiological techniques allow to improve properties of soils during exploitation of the dam. The laboratory experiment on biocementation (i.e. microbially induced calcite precipitation) of dam’s soil showed 80% increasing of deformation modulus compared to natural untreated soil. This paper describes the results of laboratory investigations of dam’s soil properties. The results of biocementation experiment are also discussed.
Добавил в систему: Максимович Николай Георгиевич

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