Underground mining
-
Research on wastewater treatment using constructed wetlands has shown that increasing the water retention time improves water treatment efficiency. Constructed wetlands are used for many purposes: polishing conventionally treated wastewater, holding and treating storm water, treating industrial or agricultural wastewater, and treating acid mine drainage and landfill leachates.
9p vithomson 02-07-2024 0 0 Download
-
Ensuring roadway stability is one of the keys to determining production efficiency and labor safety in Vietnam's underground coal mines. However, it is difficult to determine the reasonable width of coal pillars to protect the roadway and roadway deformation therefore usually occurs.
9p viwalton 02-07-2024 2 1 Download
-
The paper "Research the application of terrestrial laser scanning technology for mining management (A case study at Khe Cham mine site, Quang Ninh province)" presents the application of Terrestrial Laser Scanning technology and takes a case study at a mining pit of the Khe Cham coal mine for building digital spatial data of the mining tunnel system, transportation, ventilation, calculation of excavation volume and mining output over time in mining pit of Khe Cham coal mine, cycle 0 is 4070.19 m3 , cycle 1 is 13668.
9p tukhauquantuong1011 22-04-2024 5 2 Download
-
In the study "Building a 3D information model for underground coal mines" a 3D information model for a mine is built using BIM. The Industry Foundation Classes (IFC) standard is used to define the mining information model. Point clouds collected by Terrestrial laser scanning (TLS) provide geometric and attributive information for building BIM models. This information model was applied to the NUI BEO underground coal mine. The information model was built for important structures of the mine, including the mine shaft and tunnels.
15p tukhauquantuong1011 22-04-2024 2 2 Download
-
Despite the big data research and relevance of data analysis there has been limited empirical research and implication of data-driven supply chain networks. This paper explores the effect of data-driven supply chain capabilities on transportation (train based). In order to illustrate the shortest path calculation, London Underground Transportation open source data have been analysed through implementing different data mining tools and using programming language Python and R.
9p longtimenosee07 29-03-2024 4 2 Download
-
Ebook "Paste tailings management" provides an overview of paste tailings disposal at mine sites. It deals comprehensively with the characterization of sulphide-rich tailings, geotechnical and microstructural behaviour, surface tailings disposal applications, underground paste backfilling, and case studies. The authors place emphasis on the characterization, monitoring, disposal and treatment, as well as environmental considerations of problematic sulphidic tailings.
302p tachieuhoa 28-01-2024 4 2 Download
-
Continued part 1, part 2 of ebook "Surface and underground excavations: Methods, techniques and equipment" provides readers with contents including: excavations in upward direction – raising; shaft sinking; large sub-surface excavations; underground mining/stoping methods and mine closure; surface excavations; hazards, occupational health and safety (OHS), environment and loss prevention;...
409p thamnhuocgiai 24-09-2023 4 4 Download
-
This article analyzed and applied GCC and Convergence Confinement Method (CCM) to design the supports of underground constructions and applied them to the geological conditions of the Nam Mau coal mine - Vinacomin.
10p vibentley 08-09-2022 11 4 Download
-
This paper uses the numerical method by FLAC3D software to build the model with a height of 450 m and a width of 700 m to study the effect of the twin inclined shafts construction on the deformation of rock mass on the ground surface.
8p vibentley 08-09-2022 11 5 Download
-
The paper also presents the results of an experimental study on using fly ash for making concrete lagging at the Laboratory. The comparison of the drift support using concrete laggings in SVP steel arches fly ash-made products and conventional underground mining support will aid in demonstrating the benefits of employing fly ash.
9p vibentley 08-09-2022 9 4 Download
-
Steel Fiber-Reinforced Concrete (SFRC) is an advanced material studied and used in some developed countries in the world in recent years. The characteristics of this concrete are intensive compression, high tensile and tolerance strength, higher repeated loads, and long-term durable stability.
6p vibentley 08-09-2022 8 4 Download
-
Rock mechanics and engineering (Second edition): Part 2 has present the contents rock mechanics and engineering; rock slopes and rock slides; galleries, tunnels, mines and underground excavations; rock mechanics and dam foundations; case histories; dam foundations and tunnelling; incidents, accidents, dam disasters; the Vajont rock slide; two examples of rock slopes supported with cables;...
324p chenlinong_0310 23-02-2022 16 2 Download
-
Studying, analyzing and evaluating the basic factors affecting the wear resistance of the shear cutting drum, such as coal strength, the geometry of the cutting teeth, materials of cutting teeth, the cutting angle. Cutting depth, cutting feed and cutting speed are the basis for selecting the appropriate factors in fabrication, using the cutting teeth of the shearer.
27p closefriend09 16-11-2021 18 2 Download
-
For the purpose of ensuring sustainable development, one of the important factors is to increase labor productivity and minimize the number of workers directly working in the mine. In the context of increasing requirements for underground coal mining, the number of workers tends to decline due to shifting to other types of economy. Therefore, the mechanization investment in coal mining is the inevitable destination, which guarantees the long - term strategic development of the coal mining industry.
8p cothumenhmong9 12-01-2021 6 1 Download
-
In the field of rock mechanics, underground construction and mining, there have been many proposed methods for studying geo-hazards and also many research results that have been published in the world. In Vietnam, the numerical method is mainly used for analysis and design but not going deeply to predict the possible causes that lead to geo-hazards due to complex geological conditions. On the other hand, underground constructions and exploitation projects are often designed based on standards, regulations and experiences.
8p cothumenhmong8 04-11-2020 13 1 Download
-
Building basis of science and reality for economic - technical efficiency of PE using solutions in CM in Quang Ninh area, to make contribution to increase efficiency of coal production and coal business.
27p cothumenhmong6 17-07-2020 31 3 Download
-
Land subsidence accelerated by underground coal extraction has great effect on soil quality. Although many studies have been done with respect to land subsidence effect on different properties of soil still studies on nutrient distribution of soil in subsided land are very few. This paper focuses on effect of land subsidence on distribution of soil micronutrients in a coal mining area. For this study six sites like unaffected sites, crack-1 site, slope-1 site, maximum subsidence site, crack -2 site and slope-2 site were chosen.
7p caygaocaolon4 04-04-2020 30 3 Download
-
This paper is dedicated to the problem of stability prediction of the terrain above underground mining operations. After the initial introduction to the problem, then the short analysis of the model approaches used to solve it, and giving the algorithm for rock massif stability prediction, we describe the concept of the multiattirbute terrain stability prediction method. The application of the multiattribute prediction method for stability of the terrain above underground mining operations is presented on the example of the Brown Coal Mine Aleksinac.
17p vinguyentuongdanh 19-12-2018 16 0 Download
-
Secondary diamond sources are deposits that have been removed from the primary source (a kimberlite or lamproite pipe) by natural erosion and eventually deposited in riverbeds, along shorelines, in glaciers and on the ocean floor. They are also known as alluvial deposits. Although alluvial deposits account for only 10-15 percent of the world’s diamonds, they are generally higher-quality stones given that they retain more volume after polishing; they therefore command a higher price. The location of the diamond deposits determines the mining method that producers use (see.Figure.
116p lenh_hoi_xung 21-02-2013 54 7 Download
-
Diamond crystals form deep within the mantle of the earth when carbon is exposed to extreme pressure and very high temperatures. Volcanic rock formations such as kimberlite or lamproite pipes serve as pathways that convey the fragments of rocks and crystals from the mantle to the surface (see.Figure.1). The diamonds, along with vast quantities of magma, are blasted upward in the course of violent eruptions. Kimberlite pipes, the richest source of mined diamonds, are usually shaped like a carrot and can extend as deep as 1 to 2 kilometers underground.
34p lenh_hoi_xung 21-02-2013 52 5 Download