scholarly journals Forecast for the formation of zones of high rock pressure in the conditions of mining ore deposits in a combined way

2019 ◽  
Vol 129 ◽  
pp. 01021
Author(s):  
Marina Potapchuk ◽  
Boris Saksin ◽  
Aleksandr Sidlyar ◽  
Andrey Tereshkin ◽  
Maksim Rasskazov
Keyword(s):  
Rock Pressure ◽  
Ore Deposits ◽  
Open Pit ◽  
Eastern Region ◽  
Structural Elements ◽  
Ore Bodies ◽  
Mine Workings ◽  
The Stability ◽  
Far Eastern ◽  
Underground Method

The prospect of mining the majority of deposits in the Far Eastern region is associated with the need to switch from the open-pit to the underground method of developing deep-lying ore bodies. Ensuring the safest conditions for the combined development of the field is possible only after comprehensive studies have been carried out that make it possible to establish the peculiarities of the formation of the stress state in the rock mass taking into account the influence of various natural and technogenic factors. An assessment of the stability of structural elements of the proposed development systems at the deposits will allow identifying potentially impact hazardous areas and developing measures to maintain and protect mine workings, which will reduce the risk of dynamic manifestations of rock pressure.

scholarly journals EXTRACTION OF OPEN PIT BOTTOM RESERVES BY ROOM-AND-PILLAR METHOD USING HYBRID BACKFILL

2021 ◽  
Vol 2 (4) ◽  
pp. 205-215
Author(s):  
Sergei A. Shchukin ◽  
Aleksandr A. Neverov ◽  
Sergei A. Neverov
Keyword(s):  
Underground Mining ◽  
Strain Analysis ◽  
Open Pit ◽  
Structural Elements ◽  
3D Fem ◽  
Ore Bodies ◽  
Mining Safety ◽  
The Stability ◽  
Limiting Case ◽  
Mine Roof

For the transition from open pit to underground mining in thin and steeply dipping ore bodies, it is proposed to use the room-and-pillar method with hybrid backfill. The geotechnology assumes bottom-up mining within levels which are generally sequenced top downward. The hybrid backfill is waste rock and rubble concrete. The authors discuss the multivariate problem on the stability of structural elements of the geotechnology with ranking of basic parameters in the field of natural tectonic stresses. The geotechnology safety is proved by the 3D FEM-based stress-strain analysis of the limiting case of mine roof spans. The stress patterns in the structural elements of the technology are determined, and the areas of instability are identified. The rubble concrete pillars effectively ensure mining safety with the discussed technology. The hybrid backfill as against rock fill is a more reliable method of ground control, especially in case of increasing thickness of ore bodies.

scholarly journals SAFETY IN SUBSTOPING-AND-CAVING IN TECTONICALLY STRESSED ROCK MASSES

2021 ◽  
Vol 2 (3) ◽  
pp. 311-321
Author(s):  
Sergey A. Neverov ◽  
Anton I. Konurin ◽  
Yuri N. Shaposhnik
Keyword(s):  
Mathematical Modeling ◽  
Underground Mining ◽  
Open Pit ◽  
Open Pit Mining ◽  
Variable Degree ◽  
Structural Elements ◽  
Mining System ◽  
Sublevel Caving ◽  
Mine Workings ◽  
The Stability

Mining of a thick steeply dipping deposit using sublevel caving with end-face ore drawing in transition from open pit excavation to underground mining is considered in conditions of developed tectonics. The technology was justifed by mathematical modeling of the stress state of the rock mass using finite element method. Safe parameters of the mining system were determined by solving a variational problem with a variable degree of geomedium disturbance in the existing mining and engineering structure when depleting reserves at an advanced stoping stage. The predicted areas of stability losses for main structural elements of the mining system have been determined. Safe parameters of ore breaking and drawing were calculated using the stability condition of mine workings. Recommendations are given for the excavation of thick steeply dipping deposits under open pit mining.

Participation of Quaternary Aquifers in Groundwater Inflow to Mines in the Upper Silesian Coal Basin (USCB) / Udział Wodonośnych Utworów Czwartorzędowych W Procesie Zawodnienia Kopalń Górnośląskich

2015 ◽  
Vol 60 (1) ◽  
pp. 419-437
Author(s):  
Kazimierz Różkowski ◽  
Andrzej Różkowski ◽  
Marek Sołtysiak
Keyword(s):  
Ore Deposits ◽  
Open Pit ◽  
Hard Coal ◽  
Quaternary Sediments ◽  
Coal Basin ◽  
Groundwater Inflow ◽  
Technological Factors ◽  
Upper Silesian Coal Basin ◽  
Quaternary Aquifers ◽  
Mine Workings

Abstract The Upper Silesian Coal Basin (USCB) is situated within Variscean depression in the southern Poland. Mining of the hard coal, ore and sand deposits in the USCB has a long-lasting tradition. Exploitation has been carried out with both - open pit and mainly underground operations. The intensity of water inflows to mines depends on geogenic and technological factors. Among geogenic factors the main one is occurrence of thick water - bearing Quaternary sediments in the roof of Carboniferous ore deposits. Among technological factors the essential influence on the inflows to the mine workings have: time, depth and surface of exploitation, as well as drainage intensity.

scholarly journals Analysis of efficiency of drilling equipment use in mining operations

2021 ◽  
Vol 315 ◽  
pp. 02018
Author(s):  
Yuriy Masaev ◽  
Vladislav Masaev ◽  
Yuriy Drozdenko
Keyword(s):  
Mechanical Properties ◽  
Energy Intensity ◽  
Physical And Mechanical Properties ◽  
Structural Features ◽  
Ore Deposits ◽  
Mining Operations ◽  
Drilling Equipment ◽  
Wide Range ◽  
Mine Workings ◽  
Underground Method

When developing coal and ore deposits by underground method, it is necessary to carry out a large volume of preparatory mine workings using drilling and blasting operations. Minerals are found in rocks under various conditions and their physical and mechanical properties change in a wide range. Under such conditions, it is necessary to use drilling machines this different to the principle of action and structural features. The article considers geometric parameters of roc cutters, peculiarities of drilling modes, affecting energy intensity and drilling productivity in rocks with different strength coefficient.

scholarly journals Development of resource-saving technology when mining ore bodies by blocks under rock pressure

2020 ◽  
Vol 166 ◽  
pp. 02006 ◽  
Author(s):  
Serhii Pysmenniy ◽  
Natalya Shvager ◽  
Oleksandr Shepel ◽  
Kostiantyn Kovbyk ◽  
Oleksandr Dolgikh
Keyword(s):  
Rock Pressure ◽  
Iron Ore ◽  
Ore Deposits ◽  
Borehole Diameter ◽  
Resource Saving ◽  
Ore Bodies ◽  
Iron Ore Deposits ◽  
Degree Of Extraction

The article aims to develop the resource-saving technology when mining steep ore bodies applying 250 mm-diameter boreholes to break ore into the compressed environment. This will reduce dilution of the mined ore mass in conditions of rock pressure around blocks. When mining iron ore deposits of Kryvyi Rih basin, applied mining systems allow for creation of the compensatory space as the first stage. However, these stopes fail under rock pressure, this influencing negatively ore breaking and extraction. The degree of extraction can be increased through breaking ore mass into the compressed environment. The width of the ore layer to be broken onto the compressed environment is determined through industrial investigations. To enhance breaking conditions, it is suggested to apply boreholes of a larger diameter. However, there is no technique developed for determining thickness of the ore layer to be broken depending on the borehole diameter and the fragmentation factor. When applying 250 mm boreholes, increase of thickness of the layer to be broken from 2 to 10 m is found to cause compaction of the previously broken layer up to 3 m with the optimal ore fragmentation factor of 1.3–1.5 and 3-fold decrease of lumps yield. This results from the fact that drilling a 250 mm borehole to secure even provision of the massif with explosives reduces the line of the least resistance.

scholarly journals The influence of extensive caving zones on the state and behavior of the surface as a result of underground mining works

2020 ◽  
Vol 192 ◽  
pp. 03009
Author(s):  
Evgeny Fedorov ◽  
Khaini-Kamal Kassymkanova ◽  
Gulnar Jangulova ◽  
Natalia Miletenko
Keyword(s):  
Underground Mining ◽  
Ore Deposits ◽  
The State ◽  
Mining Operations ◽  
Applied Development ◽  
Urgent Task ◽  
Mine Workings ◽  
Mining Works ◽  
The Stability ◽  
And Behavior

The article discusses the features of the development of the Donskoy chromite deposit and the improvement of the applied development system with self-caving of ore. For a system with self-destruction of ore, as well as for other similar systems, the weakest point is mining under the collapsed massif, which largely affects the stability of mine workings, their safety for the entire period of stope excavation, the effect of extensive zones of collapse on the state and behavior surface. This problem is one of the most important and urgent, especially with the transition of mining operations to deeper horizons, where the technological features of the mine field are significantly complicated. Therefore, the formation of extensive zones of collapsed rocks in the process of stope excavation leads to the development of negative processes for the formation of extremely high loads on the support of mine workings, and in certain geotechnical situations, the collapse zones affect the state of the day surface, where subsidence is possible up to the formation of craters. All this can lead to disastrous consequences, both in mine conditions and on the surface. The study of the formation of caving zones during the development of ore deposits is an urgent task.

scholarly journals Substantiation of the method ensuring the safe development of the pit reserves of kimberlite ore deposits in the conditions of the Udachny mine

2021 ◽  
Vol 266 ◽  
pp. 03013
Author(s):  
K. A. Anisimov ◽  
V. P. Zubov
Keyword(s):  
Ore Deposits ◽  
Underground Mine ◽  
Rock Massif ◽  
Mining Operations ◽  
Pressure Drops ◽  
Low Coherence ◽  
Ore Bodies ◽  
Edge Part ◽  
Underground Mine Workings ◽  
Mine Workings

The paper discusses the features of the development of pit reserves of the Udachnaya diamondiferous pipe which consists of two closely spaced ore bodies under the protection of a moving ore-rock massif (a safety cushion). Low stability of the rock massif located between the ore bodies is indicated. Such low stability is caused by the presence of areas of increased intensity of fracturing and low coherence zones in the massif; it is also caused by the mutual impact of mining operations carried out in closely located ore bodies. A conclusion is made about the danger of collapse of sizeable rock blocks from the edge zones of the rock massif located between the ore bodies onto the safety cushion. In this case, individual rock blocks can be 0.4-0.6 tons or more, the drop height is up to 600-700 m. Impact blows on the safety cushion when rock blocks collapse onto it can cause a disruption of underground mine workings stability and occurrence of dangerous pressure drops at the outlet of air waves from the safety cushion into the underground mine workings. A method for preventing dangerous impact blows is proposed, which consists in the forced collapse (with certain parameters) of the edge part of the rock massif located between the ore bodies, onto the safety cushion.

scholarly journals USE OF LASER SCANNING TECHNOLOGIES FOR OBSERVATIONS OF DEFORMATIONS OF OPEN PIT WALLS

2020 ◽  
Vol 1 (1) ◽  
pp. 152-160
Author(s):  
Olga G. Besimbayeva ◽  
Farit K. Nizametdinov ◽  
Elena A. Oleynikova
Keyword(s):  
Laser Scanning ◽  
Iron Ore ◽  
Ore Deposits ◽  
Open Pit ◽  
Scanning System ◽  
Near Surface ◽  
Mountain Ranges ◽  
Measurement Results ◽  
Iron Ore Deposits ◽  
The Stability

The article discusses the use of laser scanning technology for observing the deformations of an open pit walls in iron ore deposits. To carry out observations and analysis of the results obtained, an iron ore quarry was selected. The task of the study is to summarize methods and technical means used at mining enterprises for observing and measuring deformations in mountain ranges. The safety and efficiency of iron ore quarries is largely determined by the methods used to monitor the deformation process and calculate the stability of the pit walls and dumps. Based on the analysis of existing approaches to solving this problem, a conclusion was drawn on the advisability of using a laser scanning system for assessing sustainability. As a result, an analysis of the measurement results obtained in a digital model of the quarry near-surface arrays was obtained, which allows creating an electronic database for further use in surveying and geomechanical tasks.

scholarly journals GEOPHYSICAL MONITORING OF THE CONDITION OF THE MASSIF IN CASE OF DEVELOPMENT OF FLAT AND INCLINED ORE BODIES

2016 ◽  
Author(s):  
О.Г. Бурдзиева ◽  
В.И. Голик
Keyword(s):  
Complex Structure ◽  
Mineral Deposits ◽  
Control Parameters ◽  
Geophysical Monitoring ◽  
Industrial Facilities ◽  
Analytical Studies ◽  
Use Of Technology ◽  
Ore Bodies ◽  
Mine Workings ◽  
The Stability

Описаны геомеханические особенности разработки месторождений рудных полезных ископаемых, сложенных маломощными пологими и наклонными рудными телами Систематизированы концепции управления рудовмещающими массивами при разработке месторождений сложного строения с развитой тектоникой и интенсивной трещиноватостью. Приведены результаты аналитического исследования влияния тектоники на устойчивость горных выработок. Предложена методика расчета безопасных параметров управления массивом. Определены безопасные для промышленных объектов параметры обнажений пород. Даны рекомендации по применению технологий с изоляцией пустот при погашении выработанного пространства. The geomechanical development features of ore mineral deposits that are composed of thin and gentle sloping ore bodies are described. The concepts for ore-hosting array management in deposit development with complex structure, developed tectonics and intense fracturing are systematized. The results of analytical studies of the tectonics effect on the stability of mine workings are presented. The methodic for calculation of the safe array control parameters is offered. The security parameters for industrial facilities outcrops are defined. The recommendations on the use of technology with filling of voids are given

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