An Improved Method For Characterizing Coal Metamorphism By Xrd,
2019
Center for Modern Analysis and Computing, China University of Mining and Technology, Xuzhou 221116, China
An Improved Method For Characterizing Coal Metamorphism By Xrd, Wang Chao, Zhao Younan, Wang Zhenwei, Lu Zhaolin
Coal Geology & Exploration
At present, the X-ray measurement method of coal metamorphism has the problem that the γ band is not well divided, the δ peak information is not used, and the background of the bottom is unreasonable. The X-ray diffraction pattern of coal with different metamorphosed degrees is compared and studied. It is proposed to correct the metamorphic coefficient formula by using the information of the slope of the 002 peak, the extended half-height width and the δ peak without deducting the so-called background information. The calculation of the XRD patterns of coal samples with different degrees of metamorphism is verified. The …
Effect Of False Boundary Of Microscopic Image On Automatic Identification Of Maceral Group,
2019
China Coal Research Institute, Beijing 100013, China; Xi'an Research Institute Co. Ltd., China Coal Technology and Engineering Group Corp., Xi'an 710077, China
Effect Of False Boundary Of Microscopic Image On Automatic Identification Of Maceral Group, Song Xiaozhong
Coal Geology & Exploration
In automatic detection of coal petrology by image analysis technology, it is found that the boundary of various components in the microscopic image of coal petrology demonstrates a "rim" of gray transition zone, and the pixel of this rim cannot reflect the true gray level of the components on both sides. In order to analyze its influence on the identification and detection of macerals, the characteristics and causes of the false boundary between various adjacent components were studied with analysis of microscopic images collected from a large number of coal samples in China. Generally, the false boundary is ring-shaped or …
Effects Of Iron-Nickel Ion Combination On Methane Produced By Lignite Fermentation,
2019
School of Energy Science and Engineering, Henan Polytechnic University, Jiaozuo 454000, China; Collaborative Innovation Center of Coalbed Methane and Shale Gas for Central Plains Economic Region, Jiaozuo 454000, China
Effects Of Iron-Nickel Ion Combination On Methane Produced By Lignite Fermentation, Xia Daping, Huang Song, Zhang Huaiwen
Coal Geology & Exploration
In order to study the mechanism of the influence of exogenous optimal iron-nickel ions combination on the gas production process of fermentation, taking Daliuta lignite as an example, experiments were carried out with different contents of iron-nickel ions and the optimal concentration of single ions was elected. The optimal combination concentration of iron-nickel ions were determined by combined design of quadratic regression and common rotation. The fermentation broth of experiment group and blank group(not to added any ions), the coal sample of before and after experiment were analyzed by gas chromatography, X-ray diffraction, Fourier transform infrared spectroscopy, etc. The results …
Origin And Geochemical Characteristics Of Coalbed Methane In Abandoned Coal Mines, Panzhuang Block, Southern Qinshui Basin,
2019
College of Mining Technology, Taiyuan University of Technology, Taiyuan 030024, China; Key Lab of Geology of Coal and Coal Measure Gas, Shanxi Province, Taiyuan 030024, China
Origin And Geochemical Characteristics Of Coalbed Methane In Abandoned Coal Mines, Panzhuang Block, Southern Qinshui Basin, Liu Chao, Feng Guorui, Zeng Fangui
Coal Geology & Exploration
In order to analyze the carbon and oxygen composition and origin of the coal seam gas(CSG) in abandoned mines, Panzhuang block, south of Qinshui basin, in this paper, the coalbed methane and produced water samples were collected. The results show that the CSG of abandoned mines is dominated by CH4, the average is 91.99%, with minor amounts of N2(6.73%) and CO2(1.26%). The δ13C values of CH4 range from -31.36‰ to -33.53‰, with an average of -32.25‰, the hydrogen isotope(δD) value is between -182.76‰ and -193.20‰, and the average value …
Mine Water Inrush Rescue Model Based On Optimized Spfa Algorithm,
2019
School of Information & Communication Engineering, Beijing Information Science and Technology University, Beijing 100101, China
Mine Water Inrush Rescue Model Based On Optimized Spfa Algorithm, Cai Mingjie, Zhu Xi’An, Liu Demin, Wang Zhangang
Coal Geology & Exploration
Due to the occurrence of coal mine water inrush accidents, it is easy to cause major personnel and property losses. In order to improve the emergency rescue capability of mine water inrush disasters and reduce the water inrush hazard, a mine water inrush rescue route model was proposed. The undirected map and the adjacency list were used to describe and store the mine roadway network. According to the calculation ratio of the height of the water level and the height of underground personnel in roadway, the safety coefficient of the roadway was calculated, and then the equivalent length of the …
Optimization Study On Correlation Method Of Multiple Coal Seams,
2019
Xi'an Research Institute Co. Ltd., China Coal Technology and Engineering Group Corp., Xi'an 710077, China
Optimization Study On Correlation Method Of Multiple Coal Seams, Shu Jiansheng, Ma Liang, Jia Lilong
Coal Geology & Exploration
At present, the development trend of coal mining in China is transferring from the east to the western regions. The Yan'an Formation coal bearing measures middle Jurassic is the most widely distributed in the west, it is of the continental sedimentary environment, which has the characteristics of big change of lithofacies, multiple coal seams, unstable coal seams and less marker, there are difficulties in coal seam correlation, such as lack of basis and multi-solution phenomenon. Based on the wide application of high precision seismic exploration and digital logging technology, the fine correlation of terrestrial multi-coal seams was carried out by …
Simulation Of Seepage Water Inrush Mechanism And Strength Controlling Factors Of Collapse Column,
2019
School of Mining, Liaoning Technical University, Fuxin 123000, China
Simulation Of Seepage Water Inrush Mechanism And Strength Controlling Factors Of Collapse Column, Huo Bingjie, Xie Zhenhua, Fan Zhanglei, Jing Xuedong
Coal Geology & Exploration
In order to study the mechanism and main control factors of seepage water inrush in roadway affected by collapse columns, Darcy, Brinkman and N-S equations were used to describe the linkage system of flow field in aquifer, collapse column and water inrush roadway. Variables such as different parameters and different boundaries were selected to analyze the main factors influencing the seepage water inrush intensity of collapse columns. The results show that under the conditions of constant pressure and flow, the increase of aquifer permeability will lead to the increase of flow velocity in an area where the aquifer meets the …
Particle Swarm Optimization-Based Bionic Principle For Solving Hydrodynamic Dispersion Coefficient In Jiang'an Campus,
2019
State Key Laboratory of Hydraulics and Mountain River Development and Protection, Institute of Water Conservancy and Hydro-Electric Power, Sichuan University, Chengdu 610065, China
Particle Swarm Optimization-Based Bionic Principle For Solving Hydrodynamic Dispersion Coefficient In Jiang'an Campus, Mei Jie, Li Guangwei, Xia Chengcheng, Liu Yaping, Liu Wen, He Xinyue
Coal Geology & Exploration
Hydrodynamic dispersion coefficient is an important parameter in the study of solute transport in groundwater. In order to understand the transport law of pollutants in groundwater, the particle swarm optimization(PSO) algorithm based on bionic principle is used to solve the hydrodynamic dispersion coefficient of phreatic aquifer under natural flow field in the dispersion test site of Jiang'an Campus of Sichuan University. Compared with the least-square method and the standard curve comparison method, the results show that the results of the standard curve method are subject to subjective influence, and the errors are relatively large. The results of least square method …
Surface Subsidence Law Caused By Fully Mechanized Caving Mining Under Railway,
2019
College of Geology & Environment, Xi'an University of Science and Technology, Xi'an 710054, China
Surface Subsidence Law Caused By Fully Mechanized Caving Mining Under Railway, Deng Niandong, Yao Ting, Shang Hui, Liu Donghai
Coal Geology & Exploration
In order to ensure the safe running of the special railway for Guozhuang coal mine, the law of surface movement and deformation in goaf of the coal mine was studied on the basis of the analysis of the actual observation data, the monitoring scheme and control measures of railway under dynamic coal mining conditions were put forward in accordance with that. The results show that the surface movement and deformation are intense, the subsidence value is large, but the subsidence velocity is relatively small on account of fully mechanized caving; Surface subsidence coefficient, the main impact tangent tanβ, …
Nishihara Acceleration Model-Based Experiment Of Creep Characteristics Of Coal,
2019
School of Energy and Environment, Zhongyuan University of Technology, Zhengzhou 451191, China
Nishihara Acceleration Model-Based Experiment Of Creep Characteristics Of Coal, Qu Lina, Li Bo
Coal Geology & Exploration
For conquering limitation that the traditional Nishihara model cannot describe the accelerated creep characteristics of coal body, according to the visco-elastic-plastic flow characteristics of coal in the accelerated creep stage, a nonlinear visco-elastic-plastic model was used to replace the ideal viscoelastic-plastic body in Nishihara model to establish the improved Nishihara acceleration model. And creep equation of the improved model under equal confining pressure triaxial condition was also deduced. Afterwards, the improved accelerated creep model was analyzed by the creep test data of coal specimens in the triaxial creep tests using the method of model identification. The results show that the …
Shear Strength Characteristics Of Slope Soil In Dumping Site In High-Cold Mining Area,
2019
Department of Geological Engineering, Qinghai University, Xining 810016, China
Shear Strength Characteristics Of Slope Soil In Dumping Site In High-Cold Mining Area, Zhou Linhu, Yang Youqing, Hu Xiasong, Li Xilai, Wang Tao, Liu Changyi
Coal Geology & Exploration
The paper aims to study the shear strength characteristics and the influencing factors of the root-soil composite systems of herbs in the dump slope of the high-cold mining area. The dumping site of Jiangcang mining area of Muli Coalfield, located in the northeastern Qinghai-Tibet Plateau, was selected as the study area. For the dump slope which was planted with Elymusnutans Griseb., combined with Poacrymophilakeng, density, moisture content and root content of different depths of root-soil composite systems below the surface of slope were tested; the cohesion and the internal friction angle of soil without roots and root-soil composite systems …
Optimization Of Surface Contact-Based Thermal Conductivity Model Of Cemented Particles,
2019
School of Resources & Safety Engineering, Central South University, Changsha 410083, China
Optimization Of Surface Contact-Based Thermal Conductivity Model Of Cemented Particles, Chen Yuanjiang, Jiang Zhiqiang, Tan Zhiren
Coal Geology & Exploration
In order to explore better the variation law of thermal conductivity of geomaterials, and reduce the thermal damage caused by the problem, according to the structural characteristics of the cemented particles, combined with the effective medium thermal conductivity model and the surface contact thermal conductivity model, the effective thermal conductivity calculation model suitable for the geotechnical cemented particulate material was constructed, and the state of the particulate matter and the cementitious matrix were considered. The transient hot wire method was applied to test the thermal conductivity of the experimental test block, and the predicted values were compared with the measured …
Numerical Calculation Of Heat Transfer In Single Medium-Deep Geothermal Well,
2019
Xi'an Research Institute of Co. Ltd., China Coal Technology and Engineering Group Corp., Xi'an 710077, China; Shaanxi Key Laboratory of Prevention and Control Technology for Coal Mine Water Hazard, Xi'an 710077, China
Numerical Calculation Of Heat Transfer In Single Medium-Deep Geothermal Well, Shang Hongbo, Zhao Chunhu, Jin Dewu, Xu Shuanhai, Wang Xiaodong, Zhang Weidong, Han Yongliang
Coal Geology & Exploration
Medium-deep geothermal single well heat transfer is a technology of developing geothermal energy to "obtain heat without extracting groundwater". This technology has the advantages of not damaging the groundwater environment and taking more heat. However, there are few studies on the numerical calculation of single well heat transfer above 3000m depth. In this paper, based on the geothermal geological conditions in Xi'an, the numerical method was used to calculate the heat transfer of a medium-deep geothermal single well with different well structures (L-shaped directional wells and cluster directional wells) under the scenario of continuous operation of a heating season. The …
Fluid Factor Of Fracture And Seismic Velocity Response In Anisotropic Coal Beds,
2019
Department of Geology & Environment, Xi'an University of Science & Technology, Xi'an 710054, China; Shaanxi Provincial Key Laboratory of Geological Support for Coal Green Exploitation, Xi'an 710054, China
Fluid Factor Of Fracture And Seismic Velocity Response In Anisotropic Coal Beds, Li Qin, Ma Suibo, Zhao Bin
Coal Geology & Exploration
The storage and transport of gas and water in coal seam are related to the density, strike and filler of cracks. Research on the identification and prediction of coal seam cracks will be helpful to prevent and control disastrous accidents in coal mines, such as water inrush and gas outburst. It plays an important role in the safety evaluation of coal mining. Based on the theory of fracture equivalent model, the variation characteristics of fluid factor in coal seam crevices with different fillings and fracture weaknesses parameters(fracture density, aspect ratio, volume modulus, shear modulus, Lamé parameters) are analyzed by combining …
Influencing Factors Of Azimuth Electromagnetic Wave Roof And Floor Detection While Drilling Along Coal Seam,
2019
School of Geosciences, China University of Petroleum(East China), Qingdao 266580, China; Xi'an Research Institute Co., Ltd., China Coal Technology and Engineering Group Corp., Xi'an 710077, China
Influencing Factors Of Azimuth Electromagnetic Wave Roof And Floor Detection While Drilling Along Coal Seam, Chen Gang, Fan Yiren, Li Quanxin
Coal Geology & Exploration
Aiming at the problems of poor detection accuracy and low efficiency of roof and floor interface in horizontal well drilling in coal mine, the design idea of explosion-proof azimuth electromagnetic wave logging tool while drilling in coal mine is put forward. In order to suit the working environment of underground coal seam, the influence of instrument parameters such as source distance, transmitting frequency and coil installation angle on signal response was obtained by forward simulation. The results show that the received signal strength of the azimuth electromagnetic wave instrument while drilling increases with the increase of transmitting frequency, coil distance …
Csamt Phase Correction And Its Application In Detection Of Water-Accumulating Area Of Goaf In Coal Mine,
2019
Xi'an Research Institute Co. Ltd., China Coal Technology and Engineering Group Corp., Xi'an 710077, China
Csamt Phase Correction And Its Application In Detection Of Water-Accumulating Area Of Goaf In Coal Mine, Su Chao, Hou Yanwei, Wang Cheng, Li Dan
Coal Geology & Exploration
Magnetic field data of controlled source audio magnetotelluric method(CSAMT) is vulnerable to electromagnetic interference, and will lead to serious degradation of phase data quality. The affected phase data are corrected by referring to the high quality phase data of adjacent measuring points and combining the least squares fitting and interpolation method. Through forward simulation analysis, it is found that cubic polynomial interpolation is effective, not only can restore the variation characteristics of phase curve more accurately, but also involve the corrected phase data in the inversion calculation, so that the inversion results are more accurate and reliable. The method is …
Test Of Water Absorbent Resin For Disposal Of Waste Mud,
2019
State Key Laboratory of Geohazard Prevention and Geoenvironment Protection, Chengdu University of Technology, Chengdu 610059, China
Test Of Water Absorbent Resin For Disposal Of Waste Mud, Wei Meng, Qi Jinhui, Zhang Ningxin, Wen Jun
Coal Geology & Exploration
In the course of engineering construction, a lot of abandoned mud is produced. How to properly handle these mud has received extensive attention. In this paper, the application of absorbent resin in waste mud treatment is studied by series of experiments. Compared with the common flocculants, the flocculation effect of absorbent resin is better, and the separation speed of waste mud solid liquid can be accelerated obviously. The water absorption rate of absorbent resin in the mud reaches 46.33 g/g, which can be incorporated into the mud to greatly reduce the water content and fluidity of the mud within 30 …
Concealed Riprap Detection Technology In Pile Foundation Engineering,
2019
Zhejiang Design Institute of Water Conservancy and Hydroelectric Power, Hangzhou 310002, China
Concealed Riprap Detection Technology In Pile Foundation Engineering, Li Junjie, Ge Longjin, Zhang Honggang, Li Jianmin, Zhu Honglei, Li Guanhao
Coal Geology & Exploration
It is often necessary to use pile foundation to deal with soft soil foundation for the newly built gate station near the seawall. If there is a concealed riprap layer in the construction area, it will affect the construction progress of pile foundation and increase the construction cost. Furthermore, the spatial distribution characteristics of riprap also play a decisive role in the selection of pile foundation construction technology. In view of the blindness problem in using the drilling method to investigate the irregular concealed riprap, we adopt the comprehensive investigation technology combining the ground penetrating radar with the high density …
Fault Identification Technology Of Ant Attribute Optimization,
2019
Research & Development Center of BGP, CNPC, Zhuozhou 072750, China
Fault Identification Technology Of Ant Attribute Optimization, Li Hongwei, Bai Xuelian, Cui Jingbin, Wan Zhonghong, Yuan Shihong, Chu Wanchang
Coal Geology & Exploration
In the field of seismic geological exploration, the ant attributes is more and more widely used for rapid identification of fault system, and in the process of practical application, ant attributes based on 3D seismic data extraction are displayed either along strata slice(plan) or in section, the features of fault system and distribution characteristics of seismic events is not corresponding to the actual situation, the application effect is poorer, fault interpretation work is given priority to with manual interpretation backbone profile, unable to realize fault automatic tracking. In view of this widespread situation, this paper studies and analyzes the actual …
Analysis Of Factors Affecting The Automatic High-Frequency Induction Brazing Strength Of Pdc,
2019
Xi'an Research Institute Co. Ltd., China Coal Technology and Engineering Group Corp., Xi'an 710077, China
Analysis Of Factors Affecting The Automatic High-Frequency Induction Brazing Strength Of Pdc, Dai Yongbo
Coal Geology & Exploration
With the development of automation and intelligentization in manufacturing industry, the research on PDC bit brazing automation is one of the key development directions of bit production technology. In order to study the influencing factors and adaptation methods of welding strength in PDC automatic brazing process, PDC high frequency induction welding and shear strength comparison test were carried out by using PDC and alloy pillar as the base material through special tooling and test conditions. Combined with the shear strength experiment and the morphology of brazing surface of PDC high-frequency induction brazing, the effect of brazing filler alloys, fluxes, surface …
