Water-Blocking Performance Of Laterite In Weak Deposition Areas Of Neogene Baode Formation And Its Significance Of Resource Exploitation,
2023
National Coal Mine Water Disaster Prevention and Control Engineering Technology Research Center, China University of Mining and Technology (Beijing), Beijing 100083, China; Inner Mongolia Research Institute, University of Mining and Technology (Beijing), Ordos 017000, China; School of Geosciences and Surveying Engineering, China University of Mining and Technology (Beijing), Beijing 100083, China; National Mine Safety Administration Key Laboratory of Mine Water Hazard Controlling, Beijing 100083, China
Water-Blocking Performance Of Laterite In Weak Deposition Areas Of Neogene Baode Formation And Its Significance Of Resource Exploitation, Zeng Yifan, Bao Han, Wu Qiang, Meng Shihao, Hua Zhaolai, Miao Yanping, Zhang Ye, Bu Wenyang
Coal Geology & Exploration
The in-depth study on the water-blocking performance of laterite in the weak deposition areas of the key aquiclude is of significant importance for mine production safety and ecological water resource protection. Specifically, the borehole data were re-optimized based on the regional sedimentary characteristics, the thickness distribution pattern of laterite deposit in Yushen mining area was studied, and the micro-engineering characteristics and control factors related to the water-blocking performance of laterite were explored. The results show that the deposition thickness of laterite gradually increases from northwest to southeast, the distribution of laterite becomes extremely uneven with the evolution of rivers, and …
Prediction Of Rockburst Intensity Grade Based On Convolutional Neural Network,
2023
Key Laboratory for Precise Mining of Intergrown Energy and Resources, China University of Mining and Technology (Beijing), Beijing 100083, China; School of Emergency Management and Safety Engineering, China University of Mining and Technology (Beijing), Beijing 100083, China
Prediction Of Rockburst Intensity Grade Based On Convolutional Neural Network, Li Kangnan, Wu Yaqin, Du Feng, Zhang Xiang, Wang Yiqiao
Coal Geology & Exploration
Rockburst is one of the urgent problems to be addressed in the process of deep resource extraction. In order to predict the rockburst disasters safely and efficiently, a rockburst intensity grade prediction model (MICE-CNN) based on the Multiple Imputation by Chained Equations (MICE) and Convolutional Neural Network (CNN) was proposed. Specifically, a predictive indicator system was established based on the main influencing factors and the acquisition conditions of rockburst. A total of 120 sets of raw data from rockburst cases were collected, with the outliers processed by pauta criterion. Then, the missing data were interpolated with the four interpolation models …
Numerical Model Of Two-Region Flow By Constant-Head Pumping In An Unconfined Aquifer,
2023
College of Civil Engineering and Architecture, Guangxi University, Nanning 530004, China; Guangxi Key Laboratory of Disaster Prevention and Engineering Safety, Nanning 530004, China; Key Laboratory of Disaster Prevention and Structural Safety of Ministry of Education, Guangxi University, Nanning 530004, China
Numerical Model Of Two-Region Flow By Constant-Head Pumping In An Unconfined Aquifer, Shi Pengyu, Zong Yijie, Teng Kaiqing, Liu Jianjun, Xiao Liang
Coal Geology & Exploration
In order to reveal the mechanism of two-region Darcian and non-Darcian flow induced by constant-head pumping tests in unconfined aquifers, a numerical model of well flow by constant-head pumping underground based on finite difference solution was proposed. In the model, it is assumed that the aquifer is divided into two regions according to the pumping flow characteristics: the finite non-Darcian flow region near the pumping well and the semi-infinite Darcian flow region far away from the pumping well. Specifically, the flow regime in the non-Darcian flow region was simulated by the Izbash’s equation, and the reliability of the proposed solution …
Status And Development Of Intelligent Drilling Tools For Coal Mine,
2023
CCTEG Xi’an Research Institute (Group) Co., Ltd., Xi’an 710077, China
Status And Development Of Intelligent Drilling Tools For Coal Mine, Gao Xiaoliang
Coal Geology & Exploration
As an important part of intelligent drilling, the intelligence of drilling tool system plays a crucial role in the intelligent development of coal mine underground drilling. In order to deeply explore the development direction of intelligent drilling tools, the research results and technical characteristics of intelligent drilling tools in coal mines were systematically sorted out from the aspects of directional drilling tools, measurement while drilling (MWD) system, intelligent drilling pipes and drill bits with reference to the experience in development of oil and gas industry, and the existing shortcomings were also summarized. It is pointed out that screw motor is …
Methods For Estimating Carbon Emissions From Coals In Underground Mines: A Case Study Of The Western Fukang Mining Area,
2023
Xinjiang Key Laboratory for Geodynamic Processes and Metallogenic Prognosis of the Central Asian Orogenic Belt, Xinjiang University, Urumqi 830017, China
Methods For Estimating Carbon Emissions From Coals In Underground Mines: A Case Study Of The Western Fukang Mining Area, Peng Rendong, Wei Bo, Li Xin, Zhang Ji, Zhang Zizhao, Wang Bo, Zhang Na, Cui Deguang
Coal Geology & Exploration
Carbon emissions have come into sharp focus of human society. The carbon emissions from coals rank as the most predominant part of China’s total carbon emissions. Presently, there is no available study on the accurate calculation of carbon emissions from coals in typical underground mines in Xinjiang, with the CH4 emission even overlooked. This study centers on the carbon emissions from coals in underground mines in the western Fukang mining area. As per the occurrence laws of CH4 and CO2 in coal seams, as well as coal mining plans, this study classified the sources of carbon emissions …
A New Physics-Informed Method For The Fracability Evaluation Of Shale Oil Reservoirs,
2023
School of Petroleum Engineering, Northeast Petroleum University, Daqing 163318, China; School of Environment, Liaoning University, Shenyang 110036, China
A New Physics-Informed Method For The Fracability Evaluation Of Shale Oil Reservoirs, Li Yuwei, Li Zijian, Shao Lifei, Tian Fuchun, Tang Jizhou
Coal Geology & Exploration
The accurate evaluation of reservoir fracability is an essential prerequisite for the fracturing design and post-fracturing productivity evaluation of reservoirs. Rock mechanical parameters have been applied to the fracability evaluation of shales presently, exhibiting great field application performance. Accordingly, it is crucial to obtain accurate rock mechanical parameters. This study developed a physics-informed neural network (PINN) model. Driven by data and physical information, the PINN model can accurately predict rock mechanical parameters using only a small amount of data. To verify its performance, the PINN model was compared with the artificial neural network, random forest, and XGBoost models. The comparison …
Water Inrush Mechanism Of Coal Mine Shaft Fracture Under Fluid-Solid Coupling,
2023
State Key Laboratory of Mining Response and Disaster Prevention and Control in Deep Coal Mines, Anhui University of Science and Technology, Huainan 232001, China; School of Civil Engineering and Architecture, Anhui University of Science and Technology, Huainan 232001, China
Water Inrush Mechanism Of Coal Mine Shaft Fracture Under Fluid-Solid Coupling, Xue Weipei, Shen Lei, Yao Zhishu, Cheng Hua, Rong Chuanxin
Coal Geology & Exploration
The occurrence of coal mine shaft fractures and water inrush accidents is alarmingly frequent, endangering the lives of underground personnel and compromising mine safety. To comprehend the influence of confined groundwater in the process of shaft fracture and the formation mechanism of water inrush channels, a model test was devised using similarity theory and coupled fluid-solid numerical simulation technology. The findings reveal that direct contact between the shaft lining and pressurized water hinders the development of load-bearing and deformation capacities. This is specifically evidenced by the premature appearance of the yield point, a reduction in peak strength and strain, and …
Zoned Prediction Of Water Inflow After Dewatering Of Working Face Based On Waterrichness Zoning Of Aquifer,
2023
Hongliulin Mining Co., Ltd., Shaanxi Coal Group, Shenmu 719300, China
Zoned Prediction Of Water Inflow After Dewatering Of Working Face Based On Waterrichness Zoning Of Aquifer, Yang Lei, Lei Fangchao, Hou Enke, Lu Bo, Feng Dong, Zhao Kaixing
Coal Geology & Exploration
As the weathered bedrock and burned rock aquifers seriously threaten the production safety of mines in the Jurassic coalfield of northern Shaanxi Province, accurate prediction of their waterrichness and water inflow at the working face is of great significance for water control in mines. Aiming at the weathered bedrock and burned rock aquifers with close hydraulic connection, the area where working face 15217 of Shaanxi Hongliulin Coal Mine is located was taken as the study area. Meanwhile, the aquifer thickness, lithological combination index, index of rock burning and weathering degree and core recovery was taken as the evaluation indexes. The …
Study On Mesoscopic Failure Characteristics Of Layered Red Shale,
2023
School of Mining, Guizhou University, Guiyang 550025, China
Study On Mesoscopic Failure Characteristics Of Layered Red Shale, Ma Zhenqian, Zhou Lang, Zuo Yujun, Zhang Jimin, Zou Yihuai, Cao Yunqin
Coal Geology & Exploration
To study the mesoscopic failure characteristics of the layered red shale, uniaxial mechanical experiments were carried out by applying DSTD-1000 electro-hydraulic servo rigid pressure on the red shale with different bedding angles. Meanwhile, SEM and XRD experiments were implemented on debris to obtain its mechanical parameters, failure characteristics, microstructure, and relative content of components. Based on this, models of the red shale with different bedding angles were constructed using the discrete element PFC3D for the uniaxial compression experiments to study the mesoscopic failure characteristics of red shale. The results show that: (1) When the bedding angle θ=30°, 45°, …
An Attention Mechanism-Based Cnn-Bilstm Real-Time Transient Electromagnetic Method,
2023
College of Geology and Environment, Xi’an University of Science and Technology, Xi’an 710054, China; Key Laboratory of Coal Resources Exploration and Comprehensive Utilization, Ministry of Natural Resources, Xi’an 710048, China
An Attention Mechanism-Based Cnn-Bilstm Real-Time Transient Electromagnetic Method, Gu Yao, Xie Haijun, Zhou Zipeng, Li Lu
Coal Geology & Exploration
The one-dimensional transient electromagnetic (TEM) method is time-consuming and suffers other drawbacks such as difficult parameter adjustment and heavy dependence on the initial model. Therefore, this study proposed a real-time TEM inversion method—the Attention mechanism-based convolutional neural network (CNN) - bidirectional Long Short-Term Memory (BiLSTM) (AC-BiLSTM). By fully utilizing the time difference, the AC-BiLSTM performed model training in non-observation time and the real-time inversion of the collected data in observation time. With the measured data mixed with a certain proportion of data obtained from forward modeling as the dataset, the sampling time and apparent resistivity as the input features in …
Numerical Simulations And Wavefield Analysis Of In-Seam Wave Advance Detection In Viscoelastic Media,
2023
School of Earth and Environment, Anhui University of Science & Technology, Huainan 232001, China
Numerical Simulations And Wavefield Analysis Of In-Seam Wave Advance Detection In Viscoelastic Media, He Dixiu, Ji Guangzhong, Jiao Wenjie, Zhang Yawei, Yu Kun
Coal Geology & Exploration
In-seam waves are commonly applied to the advance detection of hidden faults in front of mining faces. However, coal seams, which have viscoelasticity actually, imposing absorptive and attenuation effects on in-seam waves. To investigate the wave field characteristics and propagation patterns of in-seam waves in viscoelastic coal seam media, this study built a three-dimensional geological model of coal measures with faults based on Kelvin-Voigt’s first-order velocity-stress equation. Using this equation, three-dimensional finite-difference numerical simulation was carried out. The results indicate that (1) for reflected in-seam waves in viscoelastic media, which exhibit high energy attenuation, their propagation and attenuation characteristics are …
Manipulator Trajectory Planning Method Of Anchor Drilling Robot,
2023
College of Mechanical Engineering, Xi’an University of Science and Technology, Xi’an 710054, China
Manipulator Trajectory Planning Method Of Anchor Drilling Robot, Lei Mengyu, Zhang Xuhui, Yang Wenjuan, Dong Zheng, Wan Jicheng, Zhang Chao, Du Yuyang
Coal Geology & Exploration
In order to improve the support efficiency of coal mine roadway and the automation intelligence of heading face, an anchor drilling robot integrating the cantilever roadheader and the six-degree-of-freedom manipulator was designed, and studied on the anchor drilling sequence planning strategy and the drilling boom trajectory planning method. Firstly, the kinematics model of the manipulator structure was established based on the improved DH method. On this basis, the forward and inverse kinematics solutions were analyzed, and the spatial position and the corresponding joint variable values of the drilling rig were calculated. Secondly, the manipulator space was analyzed based on Monte …
Effect Of Priming And Explosive Initiation Location On Pull In Hard Rock Underground Mine,
2023
Tummalapalle Mine, Uranium Corporation of India Ltd, AP, India
Effect Of Priming And Explosive Initiation Location On Pull In Hard Rock Underground Mine, K.K. Rao, B.S. Choudhary
Journal of Sustainable Mining
In the development of hard rock mines, achieving maximum pull after blasting plays a crucial role. Various machines have been developed for rock cutting, but still, due to flexibility and cost-effectiveness, drilling and blasting are preferred. To enhance the effectiveness of this method, several techniques have been developed, including the use of appropriate stemming material, double-primer placement, selecting optimal initiation locations, improving blast designs, and exploring stress superposition techniques through electronic detonators. This research paper focuses on investigating the effect of the priming and explosive initiation location on pull through an experimental approach. The study specifically examines the influence of …
What Caused The Unseasonal Extreme Dust Storm In Uzbekistan During November 2021?,
2023
Michigan Technological University
What Caused The Unseasonal Extreme Dust Storm In Uzbekistan During November 2021?, Xin Xi, Daniel Steinfeld, Steven M. Cavallo, Jun Wang, Jiquan Chen, Kanat Zulpykharov, Geoffrey M. Henebry
Michigan Tech Publications
An unseasonal dust storm hit large parts of Central Asia on 4-5 November 2021, setting records for the column aerosol burden and fine particulate concentration in Tashkent, Uzbekistan. The dust event originated from an agropastoral region in southern Kazakhstan, where the soil erodibility was enhanced by a prolonged agricultural drought resulting from La Niña-related precipitation deficit and persistent high atmospheric evaporative demand. The dust outbreak was triggered by sustained postfrontal northerly winds during an extreme cold air outbreak. The cold air and dust outbreaks were preceded by a chain of processes consisting of recurrent synoptic-scale transient Rossby wave packets over …
Semi-Supervised Learning Method For The Augmentation Of An Incomplete Image-Based Inventory Of Earthquake-Induced Soil Liquefaction Surface Effects,
2023
Tufts University
Semi-Supervised Learning Method For The Augmentation Of An Incomplete Image-Based Inventory Of Earthquake-Induced Soil Liquefaction Surface Effects, Adel Asadi, Laurie Gaskins Baise, Christina Sanon, Magaly Koch, Snehamoy Chatterjee, Babak Moaveni
Michigan Tech Publications
Soil liquefaction often occurs as a secondary hazard during earthquakes and can lead to significant structural and infrastructure damage. Liquefaction is most often documented through field reconnaissance and recorded as point locations. Complete liquefaction inventories across the impacted area are rare but valuable for developing empirical liquefaction prediction models. Remote sensing analysis can be used to rapidly produce the full spatial extent of liquefaction ejecta after an event to inform and supplement field investigations. Visually labeling liquefaction ejecta from remotely sensed imagery is time-consuming and prone to human error and inconsistency. This study uses a partially labeled liquefaction inventory created …
SIT Study Abroad
Litio En Una Encrucijada: Voces Locales Sobre La Reforma Constitucional Del Gobernador Morales Y Su Impacto En El Futuro De La Minería En Jujuy / Lithium At A Crossroads: Local Voices On Governor Morales’ Constitutional Reform And Its Impact On The Future Of Mining In Jujuy, Maxwell Bassin
Independent Study Project (ISP) Collection
En junio de 2023, el gobernador Morales de Jujuy aprobó un cambio en la constitución provincial rápidamente, sin consultar con las comunidades indígenas. Esta reforma prohíbe cortes de rutas, refuerza los derechos de propiedad privada y criminaliza muchas formas de protesta pública. Ahora, hay mucha crítica hacia la reforma, especialmente por parte de las comunidades indígenas y grupos ambientales que tienen miedo de que, sin la posibilidad de protestar, la minería del litio se expandirá en la provincia. Esta minería es peligrosa para las comunidades indígenas porque quiere minar en su tierra y requiere mucha agua aunque el clima de …
Observing Ocean Ecosystem Responses To Volcanic Ash,
2023
Oregon State University
Observing Ocean Ecosystem Responses To Volcanic Ash, K. M. Bisson, S. Gassó, N. Mahowald, S. Wagner, B. Koffman, S. A. Carn, S. Deutsch, E. Gazel, S. Kramer, N. Krotkov, C. Mitchell, M. E. Pritchard, K. Stamieszkin, C. Wilson
Michigan Tech Publications
Volcanic eruptions can be catastrophic events, particularly when they occur in inhabited coastal environments. They also play important roles in climate and biogeochemical cycles, including through nutrient deposition in the ocean. Volcanic ash studies in the ocean have focused on the phytoplankton response, generally quantifying changes in chlorophyll-a concentration. Many gaps remain in addressing fundamental questions regarding why volcanic ash deposition may enhance or limit both phytoplankton growth and/or drive community composition shifts. Here we outline a wide, multidisciplinary vision for monitoring volcanic eruptions near ocean ecosystems from satellites, including considerations for characteristics of airborne volcanic ash and ash geochemistry …
Open-Cast Mining Deformations Monitoring Using Sentinel-1 Sar Data (Sbas Technique),
2023
Ferdowsi University of Mashhad, Department of Geography, Mashhad, Iran
Open-Cast Mining Deformations Monitoring Using Sentinel-1 Sar Data (Sbas Technique), Mahvash Naddaf Sangani, Seyed Reza Hosseinzadeh, José Francisco Martín Duque, Mahnaz Jahadi Toroghi, Kapil Kumar Malik
Journal of Sustainable Mining
Land surface deformation created by mining activities can have negative impacts on the environment. Measuring them can be a tool for managing the environmental impacts of mining. Synthetic Aperture Radar Interferometry is a remote sensing method for measuring deformations. The main aim of this research is to investigate the deformation phenomenon on a region scale and extend our understanding of it to all mining deformation areas across the country. This paper used Small Baseline Subset Interferometric Synthetic Aperture Radar technology to obtain deformations information in the Sangan mine based on mining activities. We used 48 scenes of Single Look Complex(SLC) …
Numerical Modelling Of Uniaxial Compressive Strength Laboratory Tests,
2023
Central Mining Institute, Katowice, Poland
Numerical Modelling Of Uniaxial Compressive Strength Laboratory Tests, Phu Minh Vuong Nguyen, Andrzej Walentek, Petr Waclawik, Kamil Soucek, Michał Antoniuk
Journal of Sustainable Mining
In the last decades, numerical modelling has been widely used to simulate rock mass behaviour in geo-engineering issues. The only disadvantage of numerical modelling is the reliability of required input data (e.g. mechanical parameters), which is not always fully provided due to the complexity of rock mass, project budget, available test methods or human errors. On the other hand, it was proven in many cases that numerical modelling is a helpful tool for solving such complex problems, especially when coupled with the results of laboratory and in-situ tests. This paper presents an attempt to determine the proper numerical constitutive model …
Multi-Criteria Analysis Of The Possibility Of Retrofitting The System Of Rainwater Drainage From Subsidence Basins In A Liquidated Mine,
2023
Spółka Restrukturyzacji Kopalń S.A
Multi-Criteria Analysis Of The Possibility Of Retrofitting The System Of Rainwater Drainage From Subsidence Basins In A Liquidated Mine, Andrzej Chmiela, Małgorzata Wysocka, Adam Smoliński
Journal of Sustainable Mining
Mine closure is the natural final stage of mining activity. The process of financing mine liquidation is complex and expensive. The many years of conducted hard coal extraction affect the surface height differences. Analyses of the shifts in hydrogeological conditions and water hazard states in mining plants led to legal regulation adaptations, primarily in terms of hydrogeological documentation preparation, and made it necessary to conduct work concerning new options for water hazard assessment and prevention. Current subjects of particular interest include shifts in terrain morphology and the water regime, resulting in periodic flooding and permanent flooding of the most depressed …
