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ANALYSIS OF CONSTRUCTION ACCIDENT IN SAINT PETERSBURG BASED ON CONSIDERATION OF UNDERGROUND SPACE AS A CONTAMINATED MULTICOMPONENT SYSTEM
Abstract
This paper analyzes the causes of groundwater breakthrough occurred during the excavation of deep pit in the central part of the city at the territory, which was being developed since the 14th century. Particular attention is paid to historical aspect of this area contamination and its impact on negative transformation of the underground space components such as soils, groundwater, gases, and microbiota. It is shown that the specificity of hydrodynamic and hydrochemical conditions has fundamental importance for assessing both the effectiveness of ground freezing (using calcium chloride brine) and the possibility of concrete solidifying in the existing acid-base and oxidation-reduction environment. Based on microbiological researches, the role of heterotrophic forms of microorganisms (primarily sulfate-reducing bacteria) in increasing of the underground space aggressiveness to building materials used for enclosing structures was established.
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