Subgrade Subsurface Anomalous Body Full-Waveform Inversion Based On Ground-Penetrating Radar,
2022
Geophysical Survey Instituteof Guangxi Zhuang Autonomous Region, Liuzhou 545005, China
Subgrade Subsurface Anomalous Body Full-Waveform Inversion Based On Ground-Penetrating Radar, Hu Leilei, Chen Kang, Huang Dejun, Yang Rong
Coal Geology & Exploration
The hidden dangers of road collapse and underground voids are usually difficult to notice and easy to occur in sudden. They have caused huge losses in people's lives and properties. Therefore, the detection and analysis of road collapse and underground voids are crucial. The ground-penetrating radar (GPR) is the main method for detecting the hidden dangers of urban road collapse currently by virtue of its high accuracy, high efficiency, continuous non-destructiveness and real-time imaging. A convolution type objective function FWI algorithm was proposed to solve the problem of the lower inversion accuracy and practicability caused by the inaccurate estimation of …
Data-Driven State Estimation For Improved Wide Area Situational Awareness In Smart Grids,
2022
University of South Florida
Data-Driven State Estimation For Improved Wide Area Situational Awareness In Smart Grids, Md Jakir Hossain
USF Tampa Graduate Theses and Dissertations
Wide area situational awareness (WASA) in smart grids includes automatic monitoring, perception and detection of anomalies in these systems. The goal of WASA is to make smart grids aware of their physical and operational state for more effective operational decisions and control. As such, tracking the system's state or state estimation is one of the key objectives of WASA. The extensive integration of cyber elements into smart grids, such as large deployment of various monitoring and measurement devices, provides new opportunities to improve WASA. However, the tight coupling of power grids with cyber components introduces vulnerabilities to cyber and physical …
Impact Of Voids And Backfill On Seismic Wave Velocity-Preliminary Results,
2022
Nazarbayev University, School of Mining and Geosciences, Nur-Sultan, Kazakhstan
Impact Of Voids And Backfill On Seismic Wave Velocity-Preliminary Results, Zarina Mukhamedyarova, Fidelis Suorineni, Temirlan Aldubay, Gylym Sapinov
Journal of Sustainable Mining
In this study, laboratory experiments were conducted on discrete physical models that mimic mining effects to better understand the impact of continuous changes in mining environments on seismic wave velocities. The discrete physical models are represented by concrete and granite cubic samples of different sizes with holes of different diameters filled and unfilled with cemented sand backfill of different cement-sand content ratios. The hole diameters range from 0 to 150 mm in block sizes ranging from 150 mm to 450 mm in increments of 75 mm. The increasing hole size mimics increasing extraction in the mine with time. Cemented sand …
Predicting The Stability Of Open Stopes Using Machine Learning,
2022
University of Alberta, School of Mining and Petroleum Engineering, Edmonton, Alberta T6G 2R3, Canada.
Predicting The Stability Of Open Stopes Using Machine Learning, Alicja Szmigiel, Derek B. Apel
Journal of Sustainable Mining
The Mathews stability graph method was presented for the first time in 1980. This method was developed to assess the stability of open stopes in different underground conditions, and it has an impact on evaluating the safety of underground excavations. With the development of technology and growing experience in applying computer sciences in various research disciplines, mining engineering could significantly benefit by using Machine Learning. Applying those ML algorithms to predict the stability of open stopes in underground excavations is a new approach that could replace the original graph method and should be investigated. In this research, a Potvin database …
Climate Change Curricula In Alberta, Canada: An Intersectional Framing Analysis,
2022
University of Calgary
Climate Change Curricula In Alberta, Canada: An Intersectional Framing Analysis, Greg Lowan-Trudeau
Northwest Journal of Teacher Education
This article is comprised of a climate change-focused framing analysis of proposed revisions to Alberta, Canada’s K-6 curriculum as an ideologically motivated manifestation of curricular epistemicide. Eisner’s three curricula—the explicit, implicit, and null—and scholarship related to intersectional climate and environmental justice, education, and communication provide the theoretical framework. This inquiry concludes with a critical discussion of and possible alternatives to the revised curriculum with further consideration of the implications for those involved with similar endeavours in other jurisdictions across Canada and around the world.
Quantifying The Influence Of Variations In Rock Mass Properties On Stope Stability,
2022
McGill University, Department of Mining and Materials Engineering, Canada
Quantifying The Influence Of Variations In Rock Mass Properties On Stope Stability, Shahé Shnorhokian, Hani Mitri
Journal of Sustainable Mining
Variations in rock mass properties are well-established in rock mechanics and underground mining. The literature is replete with methods of assessing them and determining values that are used in design or numerical analysis. In this paper, a simplified 3D model is constructed for a tabular orebody in the Canadian Shield and instability is quantified using the ”brittle shear ratio” criterion to calculate the volume at risk. A 1-4-7 stope pillar sequence is implemented on four active levels, and three variations in the properties of the host formation are assessed. It is observed that the locations of ore at risk follow …
Prospects For Thiourea As A Leaching Agent In Colombian Gold Small-Scale Mining: A Comprehensive Review,
2022
Universidad Pedagógica y Tecnológica de Colombia, Facultad de Ingeniería, Escuela de Ingeniería Metalúrgica, Tunja, Colombia
Prospects For Thiourea As A Leaching Agent In Colombian Gold Small-Scale Mining: A Comprehensive Review, Johana Borda, Robinson Torres
Journal of Sustainable Mining
Thiourea, as an alternative medium, is one of the most promising leaching agents for gold recovery by its commercial benefits and research challenges associated with performance and environmental impacts. This review article describes the operational conditions for the use of Thiourea vs cyanide, its chemistry, limitations, toxicity factors, environment, and recovery processes. Although thiourea gold extraction processes have not been applied on a large scale due to the instability of the reagent, its potential to overcome the limitations of cyanide is attractive to the process; with pH, potential, oxidant dosage, and temperature control, solubilized gold thiourea species are achieved. These …
Panel Destressing Strategies For Remnant Pillar Extraction,
2022
McGill University, Department of Mining and Materials Engineering, 3450 University Street, Montreal, Quebec, Canada
Panel Destressing Strategies For Remnant Pillar Extraction, Isaac Vennes, Hani Mitri
Journal of Sustainable Mining
Large-scale panel destressing is a rockburst mitigation technique employed in deep hard rock mines during remnant pillar extraction. Panels are choke blasted in the pillar footwall to cutoff the far-field major stress in the mining area and deviate them around the pillar. In this study, the effects of panel geometry and far-field stress magnitude are investigated. Destress blast performance is assessed by measuring change to the energy release rate (ERR) of all mining steps during the extraction of a simplified remnant pillar due to destressing. It is demonstrated that the energy release rate (ERR) of critical stopes is reduced by …
Seismic Activity And Flooding Of Hard Coal Mines In The Ostrava-Karvina Coalfield,
2022
Institute of Geonics of the Czech Academy of Sciences, Czech Republic
Seismic Activity And Flooding Of Hard Coal Mines In The Ostrava-Karvina Coalfield, Petr Konicek, Eva Jirankova, Vlastimil Kajzar, Jan Schreiber, Pavel Malucha, Kristyna Schuchova
Journal of Sustainable Mining
The termination of mining activities often results in post-mining problems and risks. One of these issues is the flooding of mines. Long-term mining in the Ostrava and Petrvald sub-basins in the Upper Silesian Coal Basin finished in 1994. Tens of coal seams were mined here, and the depth of mining reached more than 1000 m below the surface. Flooding of the Ostrava sub-basin started in 1994. The Ostrava and Petrvald sub-basins were flooded from one half only to prevent water from flooding into the Karvina sub-basin, where mining continued. The continual pumping of water has been carried out ever since. …
Numerical Modelling Of Destress Blasting – A State-Of-The-Art Review,
2022
State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan, Hubei, China
Numerical Modelling Of Destress Blasting – A State-Of-The-Art Review, Shuting Miao, Petr Konicek, Peng-Zhi Pan, Hani Mitri
Journal of Sustainable Mining
As a proactive mine safety measure against the occurrence of rockburst, destress blasting has been applied to numerous mining conditions to precondition highly stressed rock mass to mitigate the risk of rockburst occurrence in deep mines as well as in deep underground constructions. However, the application of destress blasting mostly depends on engineering experience, while its mechanism and efficiency have not been well understood. Rapid advances in computer technology have made numerical simulation an economical and effective method to study the rock blasting effect. Enormous research efforts have been made to numerically investigate the blasting fracture mechanism, optimize blasting design, …
Analysis Of The Application Of Methane-Bearing Capacity Test Methods In The Conditions Of Polish Mining,
2022
Central Mining Institute, Department of Mining Aerology, Plac Gwarków 1, 40-166 Katowice, Poland
Analysis Of The Application Of Methane-Bearing Capacity Test Methods In The Conditions Of Polish Mining, Marcin Karbownik
Journal of Sustainable Mining
The methane hazard is one of the natural hazards occurring in hard coal mining. The content of natural methane in hard coal seams, the so-called methane-bearing capacity, is one of the key parameters that allow for proper assessment of the methane hazard and the state of the threat of gas and rock outbursts. For safety purposes, there is a constant need to improve the methods for the determination of this parameter. In the conditions of Polish mining, the method used for methane-bearing capacity determination is the direct drill cuttings method. This paper contains a comparative study presenting three different methods …
Proposed Design Fire Scenarios For Underground Hard Rock Mines,
2022
The University of Queensland, Sustainable Minerals Institute, Australia
Proposed Design Fire Scenarios For Underground Hard Rock Mines, Rickard Hansen
Journal of Sustainable Mining
Given the complexity and uniqueness of underground hard rock mines, the application of the design fire scenario approach is recommended when evaluating fire safety in mines. Providing a full set of design fire scenarios – ensuring that several important life safety aspects are covered – for a mine can be challenging. The question is whether a catalogue of potential clusters of design fire scenarios could be developed, covering important aspects found underground? Given the general lack of research into design fires in the mining industry, this paper provides a unique analysis of design fire scenarios in underground hard rock mines. …
Effect Of Mining And Geology On Mining-Induced Seismicity – A Case Study,
2022
McGill University, Department of Mining and Materials Engineering, Canada
Effect Of Mining And Geology On Mining-Induced Seismicity – A Case Study, Heba Khalil, Tuo Chen, Yu-Hang Xu, Hani Mitri
Journal of Sustainable Mining
Mining-induced seismicity is a commonly occurring phenomenon in underground mines. This poses a greater challenge to the safety of the mining operation. This paper presents a case study of the Young-Davidson mine in northern Ontario, Canada, where seismic events of magnitude Mn 2.0+ have been observed at mining depths of 600 to 800 m below the surface. The occurrence of large seismic events at such shallow depths is the key issue of this study. A comprehensive study of the microseismic database has been conducted to discern the root causes for the unusually strong seismic activities recorded at shallow depths. The …
Shaft Liquidation Method Adjusted For High Precipitation Associated With Climate Change Impact,
2022
Central Mining Institute (GIG), Department of Extraction Technologies, Rockburst and Risk Assessment, Katowice, Poland
Shaft Liquidation Method Adjusted For High Precipitation Associated With Climate Change Impact, Jan Szymała, Joanna Całus Moszko, Ewa Janson, Dagmara Sobczak, Stanisław Konsek
Journal of Sustainable Mining
In connection with the implementation of the international project TEXMIN within the framework of the RFCS fund, a project for the liquidation of the Głowacki Shaft in Rybnik (Poland) was undertaken, which takes into account the effects of climate change, i.e. evaluation of the increase of precipitation in the region. In addition to the standard research undertaken before liquidation activities, precipitation data recorded by the Institute of Meteorology and Water Management from 1995 to 2019 was collected and the precipitation variability was analysed. As a result, a method for liquidation of the shaft was selected consisting of constructing a permeable …
A Safety Analysis On The Potential Risks Onboard Ships That Would Use Ammonia As Marine Fuel,
2022
World Maritime University
A Safety Analysis On The Potential Risks Onboard Ships That Would Use Ammonia As Marine Fuel, Praveen Raghavan Nair
World Maritime University Dissertations
No abstract provided.
Renewable Energy For Offshore Platforms Energy Optimization,
2022
World Maritime University
Renewable Energy For Offshore Platforms Energy Optimization, Mamadi Kaba
World Maritime University Dissertations
No abstract provided.
Uncertainty Analysis Of Operational Conditions In Selective Artificial Ground Freezing Applications,
2022
McGill University, Mining Engineering Department, Montreal, Quebec, Canada
Uncertainty Analysis Of Operational Conditions In Selective Artificial Ground Freezing Applications, Ahmad Zueter, Saad Akhtar, Agus Sasmito
Journal of Sustainable Mining
Artificial ground freezing (AGF) systems are susceptible to uncertain parameters highly affecting their performance. Particularly, selective artificial ground freezing (S-AGF) systems involve several uncertain operational conditions. In this study, uncertainty analysis is conducted to investigate four operational parameters: 1) coolant inlet temperature, 2) coolant flow rate, 3) pipes emissivity, and 4) pipes eccentricity. A reduced-order model developed and validated in our previous work for field-scale applications is exploited to simulate a total of 5,000 cases. The uncertain operational parameters are set according to Monte Carlo analysis based on field observations of a field-scale freeze-pipe in the mining industry extending to …
Carbonised Fluidised Fly Ash (Cffa); A New Product For Mining Engineering Purposes (Discussion Of Possible Applications),
2022
Central Mining Institute, Department of Solid Fuels Quality Assessment, Katowice, Poland
Carbonised Fluidised Fly Ash (Cffa); A New Product For Mining Engineering Purposes (Discussion Of Possible Applications), Marian Jacek Łączny, Przemysław Rompalski
Journal of Sustainable Mining
The article presents and summarises the current state of research and laboratory results on the carbonation of fly ash with carbon dioxide in the context of its use in mining engineering. Based on previous publications and patent applications, the possibilities of using carbonated fly ash from fluidised bed boilers for the following applications were discussed: securing excavations particularly susceptible to fire hazards, shotcreting and securing longwalls and supports, constructing cases, securing decommissioned shafts, and others, which means wherever the use of cement is required. It was pointed out that the removal of excess free calcium oxide makes it possible to …
Addressing Specific Safety And Occupational Health Challenges For The Canadian Mines Located In Remote Areas Where Extreme Weather Conditions Dominate,
2022
McGill University, Mining and Materials Engineering Department, Montreal, Quebec
Addressing Specific Safety And Occupational Health Challenges For The Canadian Mines Located In Remote Areas Where Extreme Weather Conditions Dominate, Rachid Halabi, Mustafa Kumral
Journal of Sustainable Mining
The number of mining operations is increasing in the Canadian North, where extreme weather conditions govern. Currently, many mine development projects are also in progress in this region. These mines’ working atmosphere and employment circumstances are highly different from regular mines. One of the main differences is the special safety issues of the Canadian North. The primary sources of these special issues are: the difficulty of finding skilled employees; high employee turnover rate; insufficient training and certification requirements; delicate employment circumstances affecting the psychological well-being of employees; permafrost; mine inspection challenges; inventory and logistic hardship; and the legislative and regulative …
Status And Prospect Of Harmless Disposal And Resource Comprehensive Utilization Of Solid Waste Of Coal Gangue,
2022
China Coal Science & Technology Ecological Environment Technology Co. Ltd., Beijing 100013, China; Xi’an Research Institute (Group) Co. Ltd., China; Coal Technology and Engineering Group Corp., Xi’an 710077, China; School of Civil Engineering and Architecture, Xi’an University of Technology, Xi’an 710048, China
Status And Prospect Of Harmless Disposal And Resource Comprehensive Utilization Of Solid Waste Of Coal Gangue, Wang Yutao
Coal Geology & Exploration
A large amount of coal gangue generated during coal production and processing is piled up on the surface, which not only causes land occupation and soil erosion, but also causes geological disasters such as landslides and debris flows. So it has a serious impact on the ecological environment of the mining area. The cumulative stockpile of coal gangue in China has exceeded 6 billion tons, accounting for 13000 hectares of land. In 2020, the output of coal gangue in China is 729 million tons, the comprehensive utilization is 526 million tons, and the comprehensive utilization rate is 72.2%. At present, …
