GAS COMPONENT IN THE UNDERGROUND SPACE: GEOECOLOGICAL ASPECT IN SOLVING ENGINEERING GEOLOGY PROBLEMS

摘要

The paper considers the influence of the biochemical gas generation processes on the formation of specific engineering geological and geoecological conditions in the underground space of megacities. It is established that the action of slightly soluble gases (methane, hydrogen, nitrogen) promotes the transition of sandy-clayey soils into a quicksand or thixotropic state. It is noted that when accumulating the slightly soluble biochemical gases, a significant gasdynamic pressure is formed, which causes the transformation of the stress-strain state of soil massif and effects on the deformations of underground structures. It has been found that the presence of highly soluble gases (carbon dioxide, hydrogen sulfide, ammonia) contributes to an increase in the aggressiveness of groundwater against the construction materials of underground structures.