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- Coalbed methane (10)
- Numerical simulation (10)
- Coal-based graphite (6)
- Open-pit coal mine (6)
- Fracture (5)
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- Qinshui basin (5)
- Baode coal mine (4)
- CBM (4)
- Drilling fluid (4)
- High concentration slurry (4)
- Hydrogeochemistry (4)
- Prospect (4)
- Water cutoff curtain (4)
- Binchang mining area (3)
- Directional drilling (3)
- Fault (3)
- Fractal theory (3)
- Fracturing (3)
- Gas drainage (3)
- Geochemistry (3)
- Geothermal energy (3)
- Goaf (3)
- Main controlling factors (3)
- Microseismic events (3)
- Microstructure (3)
- Mudstone (3)
- Ordos basin (3)
- Shale (3)
- Surrounding well test (3)
- Thermal conductivity (3)
Articles 211 - 226 of 226
Full-Text Articles in Engineering
Organic Nitrogen Forms Of Different Rank Coals In Handan-Fengfeng Mining Area, China, Hao Guoqiang, Hu Sherong
Organic Nitrogen Forms Of Different Rank Coals In Handan-Fengfeng Mining Area, China, Hao Guoqiang, Hu Sherong
Coal Geology & Exploration
Nitrogen is one of the common elements in coal. The occurrence forms of nitrogen in coal are various and vary with coal rank. Based on X-ray photoelectron spectroscopy (XPS), taking Handan-Fengfeng mining area as an example, organic nitrogen forms of different rank coals(Rran = 1.08%–3.67%) were studied, and the variation of the relative abundance of each organic nitrogen with rank was further discussed. The results show that four kinds of nitrogen forms are considered for the coals according to binding energies of N 1s XPS sub-peaks, corresponding to N-6, N-5, N-Q and N-X. N-5 is the most abundant organic nitrogen …
Lithium And Gallium Abundance And Enrichment Factors In Typical Late Permian Coal-Accumulating Basin In Guangxi, Liao Jialong, Zhang Fuqiang, Wei Mengdie, Liang Xingdong
Lithium And Gallium Abundance And Enrichment Factors In Typical Late Permian Coal-Accumulating Basin In Guangxi, Liao Jialong, Zhang Fuqiang, Wei Mengdie, Liang Xingdong
Coal Geology & Exploration
Through systematic sampling and testing of two typical Late Permian coalfields in Fusui and Xian’an, starting with the lithium and gallium abundance of the samples, and combining with the metallogenic geological background of the Late Permian coal-accumulating basin in Guangxi, the factors controlling the enrichment of lithium and gallium in coal are analyzed. The results show that lithium and gallium in coal of both coalfield have certain industrial prospect. Lithium is mainly concentrated in K1 coal seam, carbonaceous mudstone and bauxite section at the bottom of Heshan Formation, while gallium abundance in each lithology at the bottom of Heshan Formation …
Key Geological Factors And Evaluation Methods For Huge Low-Rank Coalbed Methane Reservoirs：Taking Bayanhua Depression In Erlian Basin As An Example, Yao Haipeng, Lyu Weibo, Wang Kaifeng, Li Ling, Li Wenhua, Lin Haitao, Li Fengchun, Li Zheng
Key Geological Factors And Evaluation Methods For Huge Low-Rank Coalbed Methane Reservoirs：Taking Bayanhua Depression In Erlian Basin As An Example, Yao Haipeng, Lyu Weibo, Wang Kaifeng, Li Ling, Li Wenhua, Lin Haitao, Li Fengchun, Li Zheng
Coal Geology & Exploration
In order to evaluate the potential of low rank CBM resources with large thickness, Bayanhua depression in Erlian basin is studied. By studying the genesis of CBM, buried depth of coal seam, thickness of coal seam, physical properties of coal reservoir, gas content, hydrogeology and cap rock, the key geological elements of thick and low coal rank coal reservoirs are summarized. Furthermore, a new low rank CBM resource potential evaluation method is established, and the favorable and target zones for CBM exploration and development in Bayanhua depression are delineated. The results show that the main coal-bearing strata in Bayanhua depression …
Gas Content Modeling Of No.3 Coal Seam In District 3 Of Southern Shizhuang Block, Zhou You, Zhang Songhang, Tang Shuheng, Yu Tiancheng, Feng Zhao
Gas Content Modeling Of No.3 Coal Seam In District 3 Of Southern Shizhuang Block, Zhou You, Zhang Songhang, Tang Shuheng, Yu Tiancheng, Feng Zhao
Coal Geology & Exploration
The gas content of coal seam has a direct impact on the development of coalbed methane. The gas content of coal seam in southern Shizhuang block is high, but there are many inefficient wells in the development process, and the 3D geological modeling of gas content can help determine the influence of gas content on the production of CBM wells. In this paper, the research object is the No.3 coal seam in southern Shizhuang block. Calculated gas content from linear multivariate regression by using parameters of ash content, volatile matter content and fixed carbon content and simple burial depth matches …
Numerical Simulation Of Rupture Process Of Shale Under Action Of Fluid-Solid Coupling, Lou Yili, Wu Zhonghu, Wang Anli, Zuo Yujun, Liu Hao, Sun Wenjibin
Numerical Simulation Of Rupture Process Of Shale Under Action Of Fluid-Solid Coupling, Lou Yili, Wu Zhonghu, Wang Anli, Zuo Yujun, Liu Hao, Sun Wenjibin
Coal Geology & Exploration
In order to investigate the rupture process and acoustic emission characteristics of shale under fluid-solid coupling, the numerical simulation of fluid-solid coupling of the Niutitang Formation shale in different bedding angle in the northern part of the Qianbei area was carried out by RFPA2D-Flow numerical software. Studies have shown that due to the influence of the bedding structure, the compressive strength and elastic modulus of shale show obvious anisotropy. The rupture process of shale can be divided into three stages: elasticity, yielding and destruction. With the change of the bedding angle, the shale finally showed three failure modes, namely oblique …
“Scenario-Response”-Based Emergency Decision-Making Mechanism Of Mine Water Inrush Disaster, Lian Huiqing, Yang Junwen, Han Ruigang, Meng Lu, Han Yong
“Scenario-Response”-Based Emergency Decision-Making Mechanism Of Mine Water Inrush Disaster, Lian Huiqing, Yang Junwen, Han Ruigang, Meng Lu, Han Yong
Coal Geology & Exploration
The urgency, complexity and uncertainty of mine flood accidents determine that traditional emergency decision-making models are difficult to meet the requirements of efficient emergency rescue. Using the “scenario-response” model for emergency decision-making of mine flood accidents can effectively solve the timely real-time decision-making of specific disaster scenario after disasters occur. Using a multi-case analysis method to analyze 11 typical mine flood accidents in recent years, based on the general structural description of the accident, six elements of the mine flood scenario were summarized(inrush water source, water inrush channel, water inrush position, water output, submerged range, living space) as the scenario …
Hydrochemical Formation Mechanism And Transmissivity-Impermeability Analysis Of Karst Groundwater On Both Sides Of Fault F104 In Gubei Coal Mine In Huainan, Zheng Zhuyan, Xu Guangquan, Yang Tingting, Yu Shitao, Zhang Haitao
Hydrochemical Formation Mechanism And Transmissivity-Impermeability Analysis Of Karst Groundwater On Both Sides Of Fault F104 In Gubei Coal Mine In Huainan, Zheng Zhuyan, Xu Guangquan, Yang Tingting, Yu Shitao, Zhang Haitao
Coal Geology & Exploration
It is of great practical significance for the prevention and control of groudwater hazards in North China type coalfield to judge transmissivity-impermeability of faults by using karst hydrochemical characteristics of two fault walls. Taking karst groundwater of Taiyuan Formation on both sides of fault F104 in Gubei coal mine as the research object, and based on the analysis of the hydrogeological conditions of two fault walls, main components sources and water-rock interaction differences were analyzed by using Piper trilinear diagram, ion combination ratio and principal component methods. Reverse hydrochemical simulation of karst groundwater was conducted by using PHREEQC software. …
Mining Response And Dynamic Reinforcement For Narrow Coal Pillar Next To Goaf In Working Face 1402 Of Xin’An Coal Mine, Wang Beifang, Liang Bing, Liu Wei, Zhang Jing, Chi Haibo, Liu Yahui
Mining Response And Dynamic Reinforcement For Narrow Coal Pillar Next To Goaf In Working Face 1402 Of Xin’An Coal Mine, Wang Beifang, Liang Bing, Liu Wei, Zhang Jing, Chi Haibo, Liu Yahui
Coal Geology & Exploration
with the increase of integrating coal mines under national coal de-capacity policy, the mining instability phenomenon of narrow coal pillar next to goaf is increasingly prominent, which has seriously restricted the safety and efficient production in coal mines. Therefore, stability control engineering problem of narrow coal pillar next to goaf, near No.5 drilling field on air return roadway of repeated mining face 1402 in Xin'an coal mine was as study object, a method of combining numerical simulation and theoretical analysis was used to explore the mining disturbance response characteristics of narrow coal pillar stability next to goaf, near No.5 drilling …
Multidimensional Deformation Monitoring Using Insar Technology In Yuxian Mining Area, Du Jiantao, Yan Li, Zhao Chaoying
Multidimensional Deformation Monitoring Using Insar Technology In Yuxian Mining Area, Du Jiantao, Yan Li, Zhao Chaoying
Coal Geology & Exploration
Yuxian County in Hebei Province is one of the largest mining areas in North China. This area has been suffering serious ground deformation due to underground mining activity, which not only threatens mining safety, but also seriously damages local ecological environment. To obtain the surface deformation map of the overall mining area and to analysis the spatiotemporal evolution features, 61 C-band descending track and ascending track Sentinel-1A/B images from July 2017 to September 2018 were processed based on Interferometric Synthetic Aperture Rader(InSAR) technique. In addition, the two-dimensional deformation time series of Xixizhuang mine were obtained by using the multi-dimensional deformation …
Thermal Short-Circuiting And Heat Transfer Performance Of Coaxial Borehole Heat Exchanger, Li Yongqiang, Xu Shuanhai, Zhang Weidong, Sun Yuliang, Han Yongliang, Zhang Hao, Huang Jianfeng
Thermal Short-Circuiting And Heat Transfer Performance Of Coaxial Borehole Heat Exchanger, Li Yongqiang, Xu Shuanhai, Zhang Weidong, Sun Yuliang, Han Yongliang, Zhang Hao, Huang Jianfeng
Coal Geology & Exploration
The coaxial heat exchanger is a commonly used device for deep ground source heat pump systems. Based on the fluid flow heat transfer equation, the coupled heat transfer model of the coaxial heat exchanger and the surrounding rock mass is established. Taking the first heating period as an example, the influence of the inner tube thermal conductivity and circulating water flow on the heat transfer performance was analyzed, and the heat exchanger efficiency was introduced to evaluate the thermal short-circuiting phenomenon. The following conclusions were obtained: The phenomenon of thermal short circuit becomes obvious with the increase of the thermal …
Application Of Small Scale Curvature In Small And Micro-Structure Interpretation Of Coal Field, Cheng Yan
Application Of Small Scale Curvature In Small And Micro-Structure Interpretation Of Coal Field, Cheng Yan
Coal Geology & Exploration
The interpretation and delineation of small and micro-structure which acts as one of the main disaster sources in coal mine is an important guarantee for safe and efficient production of coal mines. However, it can't satisfy the geological guarantee for precise mining by only using the traditional seismic exploration methods to solve this problem. Therefore, in this paper, we reconstruct the seismic data by extracting the components above 60 Hz from the 3D seismic data, and then extract minimum negative curvature to interpret and analyze the small and micro-structures in study areas. By comparing the revealed micro-structures and explained results …
Application Of Mine-Hole Joint Microseismic Technology In Monitoring The Damage Depth Of Working Face Floor, Duan Jianhua, Yan Wenchao, Nan Hanchen, Zhang Qingqing, Fan Xin
Application Of Mine-Hole Joint Microseismic Technology In Monitoring The Damage Depth Of Working Face Floor, Duan Jianhua, Yan Wenchao, Nan Hanchen, Zhang Qingqing, Fan Xin
Coal Geology & Exploration
Accurate prediction of the mining damage depth of floor is a key problem in the prevention and control of mining floor water hazard especially in the case with confined water. It is very important for developing the strategy of water control. According to the geological characteristics and working face layout of Baode coal mine, Shaanxi Province, a high-precision microseismic monitoring system consisting of well and hole arrays was deployed to detect the floor damage depth in working face 81307 in real time. The velocity model was calibrated and the location accuracy was verified by hammering method. It is proved that …
Forward Response Analysis Of Shield Advanced Detection With Moving Array Electrode, Zhao Shuanfeng, Bai Yunrui, Huang Tao, Wei Mingle
Forward Response Analysis Of Shield Advanced Detection With Moving Array Electrode, Zhao Shuanfeng, Bai Yunrui, Huang Tao, Wei Mingle
Coal Geology & Exploration
Aiming at problems of serious electromagnetic interference, difficult application in TBM(Tunnel Boring Machine) tunnel construction and so on, a method of shield advanced detection based on moving array electrodes is adopted. Using Comsol Multiphysics finite element simulation software to establish geoelectric model, forward response analysis is carried out for various geological conditions. The results show that adding the protective electrodes can obviously enlarge the voltage distribution range, which means the detection range increases. In order to improve the detection effect, it is necessary to add protective electrodes. Changes in the size, shape and position of the anomalous body will exhibit …
The Key Technology For Drilling Horizontal Well In Coal Seam Roof In Qianbei Mining Area, Hu Xinpeng, Zhao Yongzhe, Xu Kanshe, Wang Linjie, Li Peng, Duan Huijun
The Key Technology For Drilling Horizontal Well In Coal Seam Roof In Qianbei Mining Area, Hu Xinpeng, Zhao Yongzhe, Xu Kanshe, Wang Linjie, Li Peng, Duan Huijun
Coal Geology & Exploration
primary ways to develop the soft coal seam CBM. Aiming at the complex geological conditions and reservoir conditions in Qianbei mining area of Guizhou Province, in order to solve the problems of horizontal well leakage, well trajectory control and solid completion in the horizontal well drilling of coal seam roof, the key technology of horizontal well drilling of coal seam roof in Qianbei mining area, with the accurate control of trajectory as the core, and the technology of preventing leakage, eccentricity and solid completion are combined. Combined with on-site drilling practice, the problems of difficulties in horizontal well drilling were …
Development Of A Sensor Suite For Atmospheric Boundary Layer Measurement With A Small Multirotor Unmanned Aerial System, Kevin A. Adkins, Christopher J. Swinford, Peter D. Wambolt, Gordon Bease
Development Of A Sensor Suite For Atmospheric Boundary Layer Measurement With A Small Multirotor Unmanned Aerial System, Kevin A. Adkins, Christopher J. Swinford, Peter D. Wambolt, Gordon Bease
International Journal of Aviation, Aeronautics, and Aerospace
Small unmanned aerial systems (sUAS) are increasingly being used to conduct atmospheric research. Because of the dynamic nature and inhomogeneity of the atmospheric boundary layer (ABL), the ability of instrumented sUAS to make on-demand 3-dimensional high-resolution spatial measurements of atmospheric parameters makes them particularly suited to ABL investigations. Both fixed-wing and multirotor sUAS have been used for ABL investigations. Most investigations to date have included in-situ measurement of thermodynamic quantities such as temperature, pressure and humidity. When wind has been measured, a variety of strategies have been used. Two of the most popular techniques have been deducing wind from inertial …
Real-Time Urban Weather Observations For Urban Air Mobility, Kevin A. Adkins, Mustafa Akbas, Marc Compere
Real-Time Urban Weather Observations For Urban Air Mobility, Kevin A. Adkins, Mustafa Akbas, Marc Compere
International Journal of Aviation, Aeronautics, and Aerospace
Cities of the future will have to overcome congestion, air pollution and increasing infrastructure cost while moving more people and goods smoothly, efficiently and in an eco-friendly manner. Urban air mobility (UAM) is expected to be an integral component of achieving this new type of city. This is a new environment for sustained aviation operations. The heterogeneity of the urban fabric and the roughness elements within it create a unique environment where flight conditions can change frequently across very short distances. UAM vehicles with their lower mass, more limited thrust and slower speeds are especially sensitive to these conditions. Since …