Assoc. Prof. Dr. Elena Calic, Assoc. Prof. Dr. Konstantin Kostov, Geological engineer Natalia Kostova
С изключение на Пирин, единствената планина на Балканския полуостров включена в Списъка на световното наследство на ЮНЕСКО, е Дурмитор в Черна гора. Националният парк Дурмитор е изграден предимно от мезозойски скали, подлежащи на окарстяване. Установени са следи от три плейстоценски заледявания: циркуси, морени, ледникови езера и др. Националният парк е един от най-представителните карстови масиви в Европа с множество повърхностни и подземни карстови форми. Настоящата статия представя накратко геолого-геоморфоложките характеристики на Дурмитор.
geology, geomorphology, karst, Durmitor, Montenegro
Ch. Assistant Professor Dr. Lachezar Georgiev, Assoc. Prof. Dr. Rumen Kulev
An overview of the complications in the operation of oil wells with boom submersible pumps has been made. The applied modern methods for increasing the efficiency of the system of submersible boom pump – boom column – column of pump-compressor pipes (PKT) are considered.
operation of oil wells, complications, submersible boom pumps
The subject of the publication is the modeling of a tunnel metro section in a calculation program, which is based on the finite element method. An analysis of the obtained results for the stress and strain state in the massif during the passage of the tunnel through the section was made. The data on the surface deformations obtained from the model are compared with those actually measured during the monitoring of the construction and sizing of the primary cladding.
numerical modeling, a new Austrian tunneling method, deformations, stress and strain in the array, finite element method
This publication summarizes existing methods for extracting oil from already exploited fields and proposes an innovative, combined, cogeneration method that increases economic efficiency. The cogeneration method reduces many times the cost of producing the main components used for secondary oil production: water vapor, carbon dioxide and heat. Given the technological and economic potential – the new method is in the process of patenting. The extraction of oil from already exploited oil fields is presented as a serious reserve of essential importance for humanity and the global economy. In conclusion, some conclusions are summarized, outlining the forthcoming widespread use of already exploited oil wells in the future.
The article describes a procedure for simulating the stresses of a tunnel as excavation works progress. Rocscience software, Phase2 (RS2), is used for this purpose. The product is based on 2D modeling by the finite element method. The displacements are forecasted in the cases of application of the New Austrian tunnel method.
In June, the first two GIDROCK LV machines, intended for transportation of people and explosives, were put into operation in the mines of Lucky Invest AD – Dzhurkovo and Druzhba. In the tests, the machines showed high passability and excellent maneuverability in the narrow mine galleries.
GIDROCK LV is designed and manufactured by Allegi Engineering Ltd. in accordance with the requirements of BDS EN 1889-1: 2011 “Mining machines. Mobile machines working underground. Safety. Part 1: Railless vehicles with pneumatic tires”.
The machine is designed to perform various logistics activities in the conditions of the mines such as: transportation of people, transportation of materials, service activities, transportation of fuel materials and others.
The advantages of the machine over standard vans come from the industrial components and materials used, such as:
Bridges with integrated multi-disc brakes in an oil bath isolated from the environment.
Hydraulic steering system and brakes.
SAHR parking brake (spring-loaded with hydraulic release).
S355 and S700MC steel construction.
This ensures a high level of safety, high reliability and low costs during the service life of the equipment.
Off-road vehicles are still used in many places around the world for off-road vehicles. All of them are not specially designed for work in a mining environment. Alleggi believes that their product is extremely innovative and similar machines will be in demand in the future. The support of the native production is what the company relies on at the moment – flexibility, innovation and professionalism are what they can offer.