Population growth in cities, the need to expand the living space requires of rational use of territories within the existing boundaries of the city. The necessity of compliance with the functional zones of the city is shown on the example of a representative part of Kiev, that should be performed taking into account engineering-geological features of the territory. It is necessary to comply with the underlying zones in the underground space to ensure the bearing capacity of the soil mass. The changes in soil bases are defined as a result of changes in the stress-strain state under the construction, development of underground space, changes of soils water content as the result of soaking from the surface, formation of “perched water”, raising the groundwater level. The vibration analysis of high-rise building – the main library building is made from the dynamic loads that arise during the movement of the vehicle, taking into account the work of the pile foundation as a rigid body relative to the longitudinal axis, which passes through the center of the building at the level of the cap of piles.
The soil moisture distribution is important in terms of assessment of agricultural conditions for plant cultivations. The aim of this study is to develop methodology for monitoring soil moisture by the use of goundpenerating radar (GPR). This non-invasive geophysical method has been widely introduced for this purpose for the last decade. However, there is still lack of routinly application in agriculture. The main reasons are timeconsuming data processing and aqusition, particulary for multi-offset measurments. In order to fill this gap we tried to adapt single-offset measurment. Our field study contained several measurments for different time span after ground irrigation. We used 800 MHz shielded and 200 MHz unshelded antennas. We focused on ground wave which propagates just beneath the surface. We observed relative velocity and amplitude spectrum changes of air and ground waves after water irrigation. These changes has an explanation in electromagnetic wave propagation theory. Water irrigation causes the increase of ground wave time arrivals and shift of amplitude spectrum towards lower frequencies.
30 April 2022 in Naukovyi Visnyk Natsionalnoho Hirnychoho Universytetu
Purpose. Assessing the risks of economic and social losses caused by the activization of hazardous natural geological and technogenic processes to establish the hazards of living in post-mining areas, with a view to developing strategies for their amelioration. Methodology. Field observations were carried out to determine the state of the geological environment of the territory and individual engineering objects. The assessment of the territory stability was done relying on the mechanical and mathematical basics of engineering geology in conjunction with the approaches of system analysis and the theory of engineering and geological similarity. Methods of probability theory and mathematical statistics were used for the expert assessment and risk analysis. Cartographic materials were compiled using GIS and digital simulation methods implemented on the example of Solotvyno township. As the source material, the GIS database (geological, engineering-geological, hydrogeological, and so on), compiled at the Institute of Geological Sciences of the National Academy of Sciences of Ukraine for the territory of Solotvyno, was used alongside with the works assessing the occurrence of natural as well as man-induced processes. Findings. It has been established that the most dangerous geological and technogenic hazards on the territory examined are karst-suffusion processes, whose probability in the central part of the territory is 1. At the object level, the economic risk (4.35 10-3 thousand UAH/m2 year) has been estimated, which shows the need for protective engineering measures due to an individual risk (5.86 10-4 people/person year). This is a significant value as compared with the average one for the territory of Ukraine. Integrated and differentiated economic risks have been calculated for the territory of Solotvyno, with the distribution of risks visualized on schematic maps. Originality. The scheme for assessing the risk of hazardous geological and technogenic processes on the post-mining territory has been developed. The combined use of differentiated and integrated assessments of economic risks at the locality and object levels would optimize managerial decisions on protection against geological hazards and would permit the development of a high-quality system for settlement monitoring. Practical value. The implementation of the S&T results obtained will enhance the efficiency of the monitoring and engineering protection systems developed for the territories with the possible occurrence of major emergencies.