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The paper considers the main natural and technogenic factors forming the ecological state of the underground space and its influence on the long-term stability of buildings in such megalopolises as Saint Petersburg. Various contamination sources of Saint Petersburg underground environment, including sandy-clayey sediments, groundwater, gases of different genesis, microorganisms, as well as above-ground and underground structures, are analysed. Peculiar natural and technogenic processes, which activation or develop...

The paper considers main factors of oil hydrocarbons transformation and migration in underground medium. Influence of oil products on changes in redox and acid-alkaline conditions of underground space, as well as on intensification of various forms of microorganisms is shown. Composition and physical-mechanical properties transformation of disperse soils with different water saturation levels are experimentally studied. Failure causes of residual fuel oil storage are analysed. Role of microbial activity in formati...