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RISS 인기검색어
- 검색키워드
- 저자 : ( Irina Kozliakova ) (검색결과 2 건)
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( Irina Kozliakova ),( Aleksandr Anikeev ),( Olga Eremina ),( Irina Kozhevnikova ),( Nadezhda Anisimova ) 대한지질공학회 2019 대한지질공학회 학술발표회논문집 Vol.2019 No.2
The map of zoning territory according to its karst and suffosion hazard was built to a scale 1 : 5000 for a new metro route (7.3 km long) projected in the northeast of Moscow. The map was compiled using the geological maps of Carboniferous and preQuaternary deposits and the map of Quaternary loam distribution. The zones of two karst-suffusion hazard categories were distinguished, i.e., nonhazardous and potentially hazardous. The zoning criterion is based on the thickness of clay divide between the Quaternary-Cretaceous groundwater and the confined aquifer in Carboniferous limestone. The potentially hazardous category implies that the clay divide is either absent or its thickness is less than 10 m. It is further subdivided by the structural differences controlling the mechanism of karst-suffosion development in the soil-rock massif. Four types of geological structure have been distinguished: (1) Quaternary sand overlies Carboniferous limestone; (2) Quaternary sand including one or two layers of moraine loam overlies Carboniferous limestone; (3) Jurassic and/or Carboniferous clay overlies Carboniferous limestone, with the above-lying Quaternary sandy massif. (4) Jurassic and/or Carboniferous clay overlies the Carboniferous limestone; the above-lying Quaternary sandy massif contains one or two layers of moraine loam. For calculation of collapse sizes, we also take into account a number of other geological and hydrogeological parameters, e.g., thickness of layers, aquifer level position and hydraulic heads, etc. Therefore, the number of calculation sites exceeds the number of geological structural types. This study was supported by the Russian Science Foundation, project no. 16-17-00125-P.
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The Map of Geological Risk for the Moscow Territory
( Olga Eremina ),( Irina Kozliakova ) 대한지질공학회 2019 대한지질공학회 학술발표회논문집 Vol.2019 No.2
The map of geological risk is built (1 :50 000) for Moscow a result of superposition and expert analysis of two informational layers, i.e., hazardous geological processes (landslides, karst-suffosion, and waterlogging) and urban environment vulnerability. Five categories of risk (negligible, small, moderate, high, and very high) are distinguished proceeding from qualitative comparative assessment of possible economic loss caused by geohazards. Negligible geological risk is registered in the areas, where no geohazards or only waterlogging is pronounced, and where the density of surface engineering structures is low or the territory is not built-up. Low risk is distinguished in waterlogged areas, where engineering structures with waterproof foundations were built after 1950s. Moderate risk is typical for unbuilt-up territories, where landslides and karst-suffosion are probable; for the Moscow city business district constructed using modern engineering protection techniques, which is potentially hazardous to karst and suffusion; and for old districts built-up before 1950s, where waterlogging is developed. High and very high risk categories are distinguished in the built-up regions, where landslides and karst-suffosion processes are possible. For each risk category, we recommend measures for providing safe functioning of urban environment. Regions at high risk require special protective measures such as mandatory monitoring, compilation of detailed risk maps, scientific support of new construction, comparison of alternative project decisions, and mandatory pre-project stage of engineering survey. We suggest to include this map in the General Plan of city development. This study was supported by the Russian Science Foundation, project no. 16-17-00125-P.
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