Geomechanical assessment of the stability of internal dump on worked up foundation of the open pit edge

Purpose. Evaluation of the stability of the internal rock dump on the worked up pit edge of Pervomaiskiy quarry of SevGOK taking into consideration geometry, rock physical and mechanical properties and seismic impacts from blasting operations. Methodology. To study geomechanical stability of the pit edge while mining operations, the data of engineering and geological surveys, technological schemes for conducting open mining operations, surveying data were used. For numerical simulation of the internal dump slope stability and the pit edge slope stability, the finite element analysis software Phase2 by Rocscience Inc. is used. Findings. Geomechanical assessment of the stability of the quarry internal dump constructed on the southwestern pit edge taking into consideration complex structure, rock properties and seismic effects from blasting operations has been carried out. For a three-tier dump, safety factors were calculated taking into consideration seismic impacts from blasting operations at a quarry in the range of 0.00625-0.1 g, which corresponds to a magnitude of 3-7 earthquake. The potential effect of extinguished underground mine workings on the stability of the internal dump was assessed. Originality. It is established that the maximum potential displacement of the massif near the extinguished underground workings in the pit edge reaches the value Uxy = 7.6-22.0 m, and a large-scale subsidence area of rocks up to 50-60 m in diameter and up to 4 m in depth can form on the surface of the internal dump. Seismic impacts from blasing operation at the quarry can be as a trigger factor for geomechanical disturbances. Practical value. The results of numerical simulation of the stability of internal dump on worked up the pit edge foundation can be considered in mining development projects to ensure the safety of the open mining technology and internal dumping operations

Промивка водосховищ на р. Рось як засіб поліпшення якості води

The hydrochemical characteristics of the Ros river and factors affecting them are given. The advisability of reservoir flushing is shown, which allows to improve water quality in the river at the time when it is the worst.Наведено відомості про гідрохімічні характеристики р. Рось та чинники, що на них впливають. Показано доцільність промивки водосховищ, яка дає змогу поліпшити якість води в річці у період, коли вона є найгіршою

Application of neural network technologies in real estate valuation

В данной статье рассматривается возможность и целесообразность применения нейросетевых технологий при оценке стоимости жилой недвижимости.This article considers the possibility and feasibility of using neural network technologies in real estate valuation