ZONING THE TERRITORY IN THE NORTHWEST OF MOSCOW ACCORDING TO THE DEGREE OF KARST AND SUFFOSION HAZARD

The study of karst hazard associated with the suffusion is a very relevant topic for construction sites in Moscow upon performing engineering geological survey and developing means of protecting the territory. According to archival data, a site with an area of 4.9 km² in the north-west of the city belongs to “hazardous” category. Within this area, 42 karst sinkholes were recorded in the 20th century. In the article, the authors analyze the geological conditions of the site based on the study of more than 400 wells. The work attempts to find a connection between the parameters of the geological environment structure and the appearance of sinkholes. A map of the thickness of clay deposits overlying the karst horizon has been compiled. A new approach to zoning the territory according to the degree of karst hazard has been proposed, as a result of which the area of the territory classified as “hazard” is reduced to 2.50 km².