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Articles 2311 - 2340 of 4589

Full-Text Articles in Mining Engineering

Borehole-Roadway Seismic-While-Mining Tomography Using Correlation Time Difference, Wang Yunhong, Wang Baoli, Cheng Jianyuan, Cui Weixiong, Jin Dan Jun 2021

Borehole-Roadway Seismic-While-Mining Tomography Using Correlation Time Difference, Wang Yunhong, Wang Baoli, Cheng Jianyuan, Cui Weixiong, Jin Dan

Coal Geology & Exploration

Using shearer as a source, seismic-while-mining(SWM) technology has realized dynamic, accurate and green intelligent detection in fully mechanized mining faces, and can be used to detect static geological anomaly and dynamic mining geological disasters within the work face. Conventional SWM observation system has the defect of blind area. To solve this problem, a new observation system with detectors installed in both roadway and within boreholes are proposed, which effectively improved the imaging range. Based on seismic interferometry principle, using frequency domain correlation algorithm, this paper turns the SWM signal to explosive source signal, and computes the equivalent shot sets. In …

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The Development Of A Single-Component Non-Cable Seismograph In Underground Coal Mines, Li Yuan Jun 2021

The Development Of A Single-Component Non-Cable Seismograph In Underground Coal Mines, Li Yuan

Coal Geology & Exploration

In-seam wave seismic exploration, featured in wide detection range and high accuracy, plays an increasingly important role in the refined exploration of coal geological structures. However, most seismic exploration equipment is bulky, with a large number of cables are laid in construction, leading to low efficiency and high construction cost. This seriously restricts the development of high-precision in-seam wave seismic exploration technology in underground coal mines. Based on the design concept of nodal seismograph, the moving coil geophone is integrated into a complete cavity with the acquisition and control circuit, the time precision keeping circuit and the power supply circuit. …

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Prediction Model Of Coalbed Methane Content Based On Well Logging Parameter Optimization, Chen Tao, Zhang Zhansong, Zhou Xueqing, Guo Jianhong, Xiao Hang, Tan Chenyang, Qin Ruibao, Yu Jie Jun 2021

Prediction Model Of Coalbed Methane Content Based On Well Logging Parameter Optimization, Chen Tao, Zhang Zhansong, Zhou Xueqing, Guo Jianhong, Xiao Hang, Tan Chenyang, Qin Ruibao, Yu Jie

Coal Geology & Exploration

With the development of coalbed methane(CBM) exploration, higher accuracy of CBM content prediction is required. Based on the response characteristics of CBM logging, the correlation between logging parameters and gas content is analyzed, and the optimization strategy of logging parameters by combining MIV technology with LSSVM is proposed. The optimal logging parameters are selected as the input independent variables of network modeling, and the core parameters of LSSVM(Least Squares Support Vector Machine) network are optimized by particle swarm optimization. Finally, a set of MIV-PSO-LSSVM model suitable for CBM content prediction is constructed. The prediction performances of LSSVM, PSO-LSSVM, MIV-LSSVM, MIV-PSO-LSSVM …

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The Application Of Pneumatic Directional Drilling Technology In Gas Pre-Drainage Of Strips In Soft Coal Seams, Zhang Jie Jun 2021

The Application Of Pneumatic Directional Drilling Technology In Gas Pre-Drainage Of Strips In Soft Coal Seams, Zhang Jie

Coal Geology & Exploration

It is costly and inefficient to drill through floor tunnel to eliminate outburst in soft coal roadway strip in Huaibei Mining Area. The bedding pneumatic directional borehole technology can accurately control the borehole trajectory in the strip coal seam according to the design, and realize the outburst elimination of the strip coal roadway through drilling gas extraction. Based on soft coal seam characteristics of the Huaibei Mining Area, the coal lane stripes drainage of gas in the directional hole design, selection of pneumatic directional drilling equipment, directional bore blastholes and shield technology, the evaluation of extraction effect are studied. The …

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The Contribution Of Mining Sector To Sustainable Development In Saudi Arabia, Mourad Zmami, Ousama Ben-Salha, Sultan O. Almarshad, Houyem Chekki Jun 2021

The Contribution Of Mining Sector To Sustainable Development In Saudi Arabia, Mourad Zmami, Ousama Ben-Salha, Sultan O. Almarshad, Houyem Chekki

Journal of Sustainable Mining

The mining sector development is among the priorities of the Saudi Vision 2030. There is currently a lot of interest in the role of the mining sector in Saudi Arabia. This research contributes to this debate by empirically assessing the effects of mining on sustainable development in Saudi Arabia during the period 1980-2018. Unlike many previous studies, the three sustainable development dimensions, namely economic, social, and environmental, are jointly considered. The cointegration analysis, based on the ARDL, Gregory-Hansen, and combined cointegration tests, confirms the existence of long-run relationships between mining and all sustainable development dimensions. Furthermore, the findings lend substantial …

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Environmental, Health And Safety Intricacies Of Artisanal Mining In The Gold-Rich Landscapes Of Karamoja, North-Eastern Uganda, Eria Serwajja, Paul Isolo Mukwaya Jun 2021

Environmental, Health And Safety Intricacies Of Artisanal Mining In The Gold-Rich Landscapes Of Karamoja, North-Eastern Uganda, Eria Serwajja, Paul Isolo Mukwaya

Journal of Sustainable Mining

Artisanal small-scale gold mining presents opportunities for Uganda’s rural poor. However, it also poses serious environmental, health and safety challenges. A suite of data collection methods including interviews, focus groups discussions, water and soils sampling were used to examine the perceptions of miners on the status, prevalence and extent of mercury use in artisanal gold mining, mercury transit routes and toxicity levels of soils and water in Karamoja sub-region. It also explores the health, safety and environmental implications of artisanal small-scale gold mining in the sub-region. The findings show that trade and access to mercury is widespread; although trade in, …

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Characterizing Soil Stiffness Using Thermal Remote Sensing And Machine Learning, Jordan Ewing, T. Oommen, Paramsothy Jayakumar, Russell Alger Jun 2021

Characterizing Soil Stiffness Using Thermal Remote Sensing And Machine Learning, Jordan Ewing, T. Oommen, Paramsothy Jayakumar, Russell Alger

Michigan Tech Publications, Part 1

Soil strength characterization is essential for any problem that deals with geomechanics, including terramechanics/terrain mobility. Presently, the primary method of collecting soil strength parameters through in situ measurements but sending a team of people out to a site to collect data this has significant cost implications and accessing the location with the necessary equipment can be difficult. Remote sensing provides an alternate approach to in situ measurements. In this lab study, we compare the use of Apparent Thermal Inertia (ATI) against a GeoGauge for the direct testing of soil stiffness. ATI correlates with stiffness, so it allows one to predict …

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Spatiotemporal Interactions Between Surface Coal Mining And Land Cover And Use Changes, Nikolaos Paraskevis, Aikaterini Servou, Christos Roumpos, Francis Pavloudakis Jun 2021

Spatiotemporal Interactions Between Surface Coal Mining And Land Cover And Use Changes, Nikolaos Paraskevis, Aikaterini Servou, Christos Roumpos, Francis Pavloudakis

Journal of Sustainable Mining

Long-term surface mining and land cover and use changes have been evidenced to have a critical relationship. This study conducts trend and correlation analysis by statistical tools to quantitatively evaluate this relationship in the Ptolemais (Northern Greece) coal mining area for the period 1990-2018. Firstly, based on Corine data and satellite images, a relative spatial indicator (RSI) was adopted to describe the mineral land areas. Secondly, land cover and use changes were spatially defined using Corine data and ArcGIS tools. The active mining area was then distinguished by dumping area, using Landsat satellite imagery and mining maps, and finally, mine …

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Evaluating The Performance Of Extreme Learning Machine Technique For Ore Grade Estimation, Clara Akalanya Abuntori, Sulemana Al-Hassan, Daniel Mireku-Gyimah, Yao Yevenyo Ziggah Jun 2021

Evaluating The Performance Of Extreme Learning Machine Technique For Ore Grade Estimation, Clara Akalanya Abuntori, Sulemana Al-Hassan, Daniel Mireku-Gyimah, Yao Yevenyo Ziggah

Journal of Sustainable Mining

Due to the complex geology of vein deposits and their erratic grade distributions, there is the tendency of overestimating or underestimating the ore grade. These estimated grade results determine the profitability of mining the ore deposit or otherwise. In this study, five Extreme Learning Machine (ELM) variants based on hard limit, sigmoid, triangular basis, sine and radial basis activation functions were applied to predict ore grade. The motive is that the activation function has been identified to play a key role in achieving optimum ELM performance. Therefore, assessing the extent of influence the activation functions will have on the final …

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Selection Mining Methods Via Multiple Criteria Decision Analysis Using Topsis And Modification Of The Ubc Method, Mahrous Ali Mohamed Ali, Jong-Gwan Kim Jun 2021

Selection Mining Methods Via Multiple Criteria Decision Analysis Using Topsis And Modification Of The Ubc Method, Mahrous Ali Mohamed Ali, Jong-Gwan Kim

Journal of Sustainable Mining

Mine designers often face difficulties in selecting an appropriate mining method; however, such a method should be selected based on ore and rock characteristics. The selection of mining methods can be considered a type of multi-criteria decision making, and this depends on many factors used in the selection process. The general method used in this field is the University of British Columbia (UBC) method, which determines the criteria of the properties that are compared to determine the best and worst of several mining methods. In this paper we used as new technique which define as Technique for Order of Preference …

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Contested Landscapes, Disputed Realities: An Investigation Of Socio-Environmental Conflict From Mining In Northern Ecuador: An Honors Thesis, Ian F. Hirons Jun 2021

Contested Landscapes, Disputed Realities: An Investigation Of Socio-Environmental Conflict From Mining In Northern Ecuador: An Honors Thesis, Ian F. Hirons

Student Works

For decades, Ecuador has been one of the preeminent petrostates in South America. However, in response to recent drops in global demand and pricing for oil products, the country has made serious commitments to further develop its mineral resources. By opening a new natural resource sector, Ecuador has firmly cemented itself as a primarily extractivist nation. In the process, the national government has frequently come into conflict with activist and community groups who protest the encroachment of extractive industry. This thesis explores the various dimensions of socio-environmental conflict created by large-scale mining projects in northern Ecuador with specific attention to …

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Effect Of Synergistic Aging On Bauxite Residue Dust Reduction Performance Via The Application Of Colloids, An Orthogonal Design‐Based Study, Xuhan Ding, Guang Xu, Dengfei Wang, Zhenmin Luo, Tao Wang Jun 2021

Effect Of Synergistic Aging On Bauxite Residue Dust Reduction Performance Via The Application Of Colloids, An Orthogonal Design‐Based Study, Xuhan Ding, Guang Xu, Dengfei Wang, Zhenmin Luo, Tao Wang

Mining Engineering Faculty Research & Creative Works

The application of polymer colloids is a promising approach for bauxite residue dust pollution control. However, due to the existence of synergistic aging, the efficiency of colloid dynamic viscosity to predict the dust control performance of bauxite residue is unclear. Previous studies were also rarely performed under synergistic aging conditions. Thus, this paper investigates the relationship between colloids' viscosity and dust control performance under synergistic aging modes. Results illustrated that the binary colloid achieved better dust control performance than unitary colloid for their higher viscosity and penetration resistance. For both unitary and binary colloid, higher viscosity results in better crust …

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Natural Molybdenite-And Tyrosinase-Based Amperometric Catechol Biosensor Using Acridine Orange As A Glue, Anchor, And Stabilizer For The Adsorbed Tyrosinase, Yan Zhang, Yue Wang, Zhiqiang Zhang, Ahmed Sobhy, Susumu Sato, Masaya Uchida, Yasushi Hasebe Jun 2021

Natural Molybdenite-And Tyrosinase-Based Amperometric Catechol Biosensor Using Acridine Orange As A Glue, Anchor, And Stabilizer For The Adsorbed Tyrosinase, Yan Zhang, Yue Wang, Zhiqiang Zhang, Ahmed Sobhy, Susumu Sato, Masaya Uchida, Yasushi Hasebe

Mining Engineering Faculty Research & Creative Works

To develop a natural mineral-based electrochemical enzyme biosensor, natural molybdenite (MLN), tyrosinase (TYR), and acridine orange (AO) were coadsorbed onto a glassy carbon electrode (GCE). The developed TYR/AO/MLN-GCE-based amperometric TYR biosensor exhibited excellent performance for highly sensitive determination of catechol (linear range, 0.1-80 μM; sensitivity, 0.0315 μA/μM; LOD, 0.029 μM; response time, <4 >s) with good reproducibility and good operational and storage stabilities. The electrochemical impedance spectroscopy (EIS) and quartz crystal microbalance with dissipation (QCM-D) revealed interesting roles of AO: (1) an efficient glue for enhancing the amount of the adsorbed TYR on the MLN-GCE, (2) an anchor for efficient orientation …

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Giant Power Density Produced By Pin-Pmn-Pt Ferroelectric Single Crystals Due To A Pressure Induced Polar-To-Nonpolar Phase Transformation, Sergey I. Shkuratov, Jason Baird, Vladimir G. Antipov, Christopher S. Lynch, Shujun Zhang, Jay B. Chase, Hwan R. Jo May 2021

Giant Power Density Produced By Pin-Pmn-Pt Ferroelectric Single Crystals Due To A Pressure Induced Polar-To-Nonpolar Phase Transformation, Sergey I. Shkuratov, Jason Baird, Vladimir G. Antipov, Christopher S. Lynch, Shujun Zhang, Jay B. Chase, Hwan R. Jo

Mining Engineering Faculty Research & Creative Works

The search for ferroelectric materials capable of producing high electric charge and power densities is important for developing a new generation of autonomous ferroelectric megawatt power supplies and ultrahigh-power-density ferroelectric energy storage devices. Here we report the results of experimental investigations of the mechanism for stress-induced depolarization of adiabatically compressing rhombohedral Pb(In1/2Nb1/2)O3-Pb(Mg1/3Nb2/3)O3-PbTiO3 (PIN-PMN-PT) single crystals. The important finding is that the geometric dimensions of PIN-PMN-PT crystals and the direction of adiabatic compression relative to the crystallographic orientation have significant impacts on the depolarization dynamics and the generated charge density. Based on the analysis of experimental results, we conclude that a …

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Potentials Of Airborne Hyperspectral Aviris-Ng Data In The Exploration Of Base Metal Deposit—A Study In The Parts Of Bhilwara, Rajasthan, Arindam Guha, Uday Kumar Ghosh, Joyasree Sinha, Amin Beiranvand Pour, Ratnakar Bhaisal, Snehamoy Chatterjee, Nikhil Kumar Baranval, Nisha Rani, K. Vinod Kumar, Pamaraju V.N. Rao May 2021

Potentials Of Airborne Hyperspectral Aviris-Ng Data In The Exploration Of Base Metal Deposit—A Study In The Parts Of Bhilwara, Rajasthan, Arindam Guha, Uday Kumar Ghosh, Joyasree Sinha, Amin Beiranvand Pour, Ratnakar Bhaisal, Snehamoy Chatterjee, Nikhil Kumar Baranval, Nisha Rani, K. Vinod Kumar, Pamaraju V.N. Rao

Michigan Tech Publications, Part 1

In this study, we have processed the spectral bands of airborne hyperspectral data of Advanced Visible Infrared Imaging Spectrometer-Next Generation (AVIRIS-NG) data for delineating the surface signatures associated with the base metal mineralization in the Pur-Banera area in the Bhilwara district, Rajasthan, India.The primaryhost rocks of the Cu, Pb, Zn mineralization in the area are Banded Magnetite Quartzite (BMQ), unclassified calcareous silicates, and quartzite. We used ratio images derived from the scale and root mean squares (RMS) error imagesusing the multi-range spectral feature fitting (MRSFF) methodto delineate host rocks from the AVIRIS-NG image. The False Color Composites (FCCs) of different …

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Global Health Effects Of Future Atmospheric Mercury Emissions, Yanxu Zhang, Zhengcheng Song, Shaojian Huang, Peng Zhang, Yiming Peng, Peipei Wu, Jing Gu, Stephanie Dutkiewicz, Huanxin Zhang, Shiliang Wu, Feiyue Wang, Long Chen, Shuxiao Wang, Ping Li May 2021

Global Health Effects Of Future Atmospheric Mercury Emissions, Yanxu Zhang, Zhengcheng Song, Shaojian Huang, Peng Zhang, Yiming Peng, Peipei Wu, Jing Gu, Stephanie Dutkiewicz, Huanxin Zhang, Shiliang Wu, Feiyue Wang, Long Chen, Shuxiao Wang, Ping Li

Michigan Tech Publications, Part 1

Mercury is a potent neurotoxin that poses health risks to the global population. Anthropogenic mercury emissions to the atmosphere are projected to decrease in the future due to enhanced policy efforts such as the Minamata Convention, a legally-binding international treaty entered into force in 2017. Here, we report the development of a comprehensive climate-atmosphere-land-ocean-ecosystem and exposure-risk model framework for mercury and its application to project the health effects of future atmospheric emissions. Our results show that the accumulated health effects associated with mercury exposure during 2010–2050 are $19 (95% confidence interval: 4.7–54) trillion (2020 USD) realized to 2050 (3% discount …

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Characterizing The Dormancy And Repair Of A Circumneutral Passive Remediation System Receiving Iron And Sulfate-Rich Amd, Garrett Struble May 2021

Characterizing The Dormancy And Repair Of A Circumneutral Passive Remediation System Receiving Iron And Sulfate-Rich Amd, Garrett Struble

Electronic Theses and Dissertations

The Wingfield Pines remediation system is a ~20-acre circumneutral, gravity-fed system constructed in 2009 to passively remediate Fe from an ~2000 gallon/minute effluent. In 2017, a fracture to the system’s underground cavern caused the AMD effluent to bypass the system, flowing directly into Chartiers Creek and leaving the system decommissioned between 2017-2019. Soil slurry and water samples were collected in the weeks prior to the system’s reinstalment in September 2019 through January 2020 in order to determine the effect of the repair on remediation efficiency and microbial community composition. This study acted as the first to describe the temporary decommissioning …

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Modeling Hydraulic Fracturing Initiation And Propagation In Porous Rock Formationsl, Chang Huang May 2021

Modeling Hydraulic Fracturing Initiation And Propagation In Porous Rock Formationsl, Chang Huang

LSU Doctoral Dissertations

Hydraulic fracturing has long been introduced to the oil and gas industry since the early nineteenth century for both reservoir characterization and reservoir stimulation. Despite the progress made in the last two decades, many challenges still have not been tackled regarding not only the propagation problem but also the initiation problem due to its complexity. The dissertation is divided into two stages, i.e., before and after fracture initiation. The first stage of the research aimed at improving the accuracy in solving the poro-mechanical response of wellbore during fluid injection before a tensile fracture occurs, which is crucial to determine the …

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Application Of Eh-Ph Diagrams On Acid Leaching Systems For The Recovery Of Rees From Bastnaesite, Monazite And Xenotime, Peijia Lin, Xinbo Yang, Joshua M. Werner, Rick Q. Honaker Apr 2021

Application Of Eh-Ph Diagrams On Acid Leaching Systems For The Recovery Of Rees From Bastnaesite, Monazite And Xenotime, Peijia Lin, Xinbo Yang, Joshua M. Werner, Rick Q. Honaker

Mining Engineering Faculty Publications

Bastnaesite, monazite and xenotime are rare earth minerals (REMs) that are typical sources for rare earth elements (REEs). To advance the understanding of their leaching and precipitation behavior in different hydrometallurgical processes, Eh-pH diagrams were constructed and modified using the HSC 9.9 software. The aqueous stability of rare earth elements in H2O and acid leaching systems, i.e., the REE-Ligands-H2O systems, were depicted and studied based on the Eh-pH diagrams. This study considers the most relevant lixiviants, their resulting equilibrium states and the importance in the hydrometallurgical recovery of rare earth elements (REMs). A literature review was …

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Table Of Contents, The Editors Apr 2021

Table Of Contents, The Editors

Coal Geology & Exploration

No abstract provided.

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Progress Of Coal Fines Agglomeration And Settlement Mechanism Based On High Efficiency Coalbed Methane Drainage, Li Yong, Han Wenlong, Wang Yanbin, Meng Shangzhi, Wu Xiang, Wang Zhuangsen, Ma Zhentao, Liu Du, Zhao Shihu Apr 2021

Progress Of Coal Fines Agglomeration And Settlement Mechanism Based On High Efficiency Coalbed Methane Drainage, Li Yong, Han Wenlong, Wang Yanbin, Meng Shangzhi, Wu Xiang, Wang Zhuangsen, Ma Zhentao, Liu Du, Zhao Shihu

Coal Geology & Exploration

Significant low-yield and inefficient wells seriously hinder the development of China’s coalbed methane (CBM) industry, and the coal fractures and production pipes blocking caused by the coal fines settlement are the key influencing factors. This paper systematically investigates the latest research progress in the composition, generation mechanism, suspension transport and output control of coal fines produced by coalbed methane wells at home and abroad, summarizes the control mechanism and key issues of coal fines agglomeration-settlement and dispersion behavior, and proposes research prospects. The coal fines problem accompanies the entire process of CBM exploration and development, involving all aspects of geological …

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Causes For Low Cbm Production Of Vertical Wells And Efficient Development Technology In Northern Zhengzhuang Block In Qinshui Basin, Jia Huimin, Hu Qiujia, Fan Bin, Mao Chonghao, Zhang Qing Apr 2021

Causes For Low Cbm Production Of Vertical Wells And Efficient Development Technology In Northern Zhengzhuang Block In Qinshui Basin, Jia Huimin, Hu Qiujia, Fan Bin, Mao Chonghao, Zhang Qing

Coal Geology & Exploration

In order to realize the efficient development of deep CBM in the north of Zhengzhuang block in Qinshui Basin, firstly, the geological conditions and development data of coal reservoir are deeply analyzed, and the development data of shallow CBM are compared. Secondly, based on the evaluation of gas content, the difficulty of coalbed methane recovery is evaluated by comprehensive evaluation of reservoir permeability, reservoir-desorption pressure difference, coal structure and in-situ stress state-Finally, the reasons for low production of CBM wells in the northern Zhengzhuang Block are clarified, and the adaptive technology for efficient development is put forward. The results show …

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The Enrichment And High Yield Law Of Cbm In Yanjiao Syncline In Zhijin Block, Guizhou Province, Guo Tao Apr 2021

The Enrichment And High Yield Law Of Cbm In Yanjiao Syncline In Zhijin Block, Guizhou Province, Guo Tao

Coal Geology & Exploration

In view of the problems such as the large number of coal seams, the thin single layer, the complex structure, much mylonite coal and hard to evaluate favorable area in southern China, this paper makes use of the exploration achievements and tests data of Zhijin Block to study the reservoir-forming conditions of multiple coal seam CBM. The results show that the enrichment and high yield CBM in south China is characterized by “sedimentation storage-control, preservation gas-control, geostress coal structure control production”. The thickness, number and quality of coal are controlled by sedimentation, which determines the resource base of coal bed …

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Practice Of Enhanced Gas Extraction By Staged Fracturing With Comb-Shaped Long Hole In Coal Mine Roof, Jia Bingyi, Chen Dongdong, Wu Jie, Sun Siqing, Wang Jianli, Zhao Jizhan, Zhang Jie Apr 2021

Practice Of Enhanced Gas Extraction By Staged Fracturing With Comb-Shaped Long Hole In Coal Mine Roof, Jia Bingyi, Chen Dongdong, Wu Jie, Sun Siqing, Wang Jianli, Zhao Jizhan, Zhang Jie

Coal Geology & Exploration

In order to solve the problems of drilling construction difficulty, low gas drainage concentration, poor drainage effect and inability to realize the predrainage of large area, based on the existing directional drilling technology and hydraulic fracturing technology in coal mines, combined with the previous research results, the staged hydraulic fracturing technology of comb-shaped long borehole in roof was proposed, and the field test was carried out in Sangshuping No.2 well in Hancheng mining area.The test results show that the main hole length of comb-shaped hole in roof was 588 m, including 8 branch holes, the total drilling footage was 1 …

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Different-Source Prediction Of Gas Emission Based On Sapso-Elm And Its Application, Ren Haifeng, Yan Youji, Wu Qinghai Apr 2021

Different-Source Prediction Of Gas Emission Based On Sapso-Elm And Its Application, Ren Haifeng, Yan Youji, Wu Qinghai

Coal Geology & Exploration

In order to improve the accuracy of gas emission prediction, in view of the multiple correlations and complexity of the influencing factors of gas emission, principal component analysis and separated source prediction theory were combined, the gas emission data of the mining layer, adjacent layer, and goaf were respectively subjected to principal component analysis to reduce dimensionality, and the predictor was obtained. Aiming at the problem that the input weight matrix and hidden layer threshold of the extreme learning machine were generated randomly, the simulated annealing particle swarm optimization algorithm was used to optimize the parameters of the extreme learning …

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Mechanism And Control Of Strong Ground Pressure In Fully Mechanized Mining Face, Zhang Yin, Zhao Yi, Li Hao Apr 2021

Mechanism And Control Of Strong Ground Pressure In Fully Mechanized Mining Face, Zhang Yin, Zhao Yi, Li Hao

Coal Geology & Exploration

In order to ensure the safe use of the withdrawal roadway in the fully mechanized mining face of thick coal seam, taking the strong ground pressure behavior of the withdrawal roadway in 31102 working face of Nalinhe No.2 well as the method of combination of field monitoring and theoretical analysis, the strong ground pressure behavior of the withdrawal roadway in the mining process of fully mechanized mining face in thick coal seam was studied. The results show that: the strong ground pressure behavior of withdrawal roadway in fully mechanized mining face of thick coal seam is mainly the result of …

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Characteristics Of Shale Gas Reservoir In Upper Paleozoic Coal Measures In Yangquan Block, Qinshui Basin, Li Yangyang, Li Xianqing, Zhang Xueqing, Xiao Xianming, Yu Zhenfeng, Wang Baoyu Apr 2021

Characteristics Of Shale Gas Reservoir In Upper Paleozoic Coal Measures In Yangquan Block, Qinshui Basin, Li Yangyang, Li Xianqing, Zhang Xueqing, Xiao Xianming, Yu Zhenfeng, Wang Baoyu

Coal Geology & Exploration

Shale reservoir characteristics are the basic content of shale gas storage capacity evaluation. In order to explore the properties of high-evolved coal-measures shale gas reservoirs and optimize favorable reservoirs, various experimental methods of rock pyrolysis, X-ray diffraction, scanning electron microscopy, high-pressure mercury intrusion, low-temperature N2 and CO2 gas adsorption were applied to the Qinshui Basin. Reservoir characteristics were studied with core samples of coal-measure shale core from the Upper Paleozoic in Yangquan Block. The results show that the Upper Paleozoic coal-measures shale in Yangquan Block of the Qinshui Basin has a high content of organic carbon(average TOC is …

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Rock Breaking Mechanism Of Composite Impact Of Full-Size Pdc Bit Based On Finite Element Analysis, Peng Xu, Hao Shijun Apr 2021

Rock Breaking Mechanism Of Composite Impact Of Full-Size Pdc Bit Based On Finite Element Analysis, Peng Xu, Hao Shijun

Coal Geology & Exploration

In order to solve the problems of low rock breaking efficiency in hard formation and the decrease of bit life caused by stick-slip vibration of drilling tools, the full-size bit composite impact rock breaking mechanism was studied by finite element method(ANSYS). The effects of impact frequency, WOB(weight on bit) and rotational speed on the efficiency of rock breaking were analyzed. It was found that both tensile and compressive stresses existed in rock during bit rock breaking, and rock failure was manifested in comprehensive failure of “tensile & compressive shear”. It is concluded that under the condition of torsional impact frequency …

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Research On The Grouting And Setting Pressure Of The Automatic Hole Sealing Device In Underground Coal Mine, Li Chengcheng, Wang Yi, Wang Li, Duan Huijun Apr 2021

Research On The Grouting And Setting Pressure Of The Automatic Hole Sealing Device In Underground Coal Mine, Li Chengcheng, Wang Yi, Wang Li, Duan Huijun

Coal Geology & Exploration

Grouting pressure and setting pressure are the main parameters for designing an automatic hole sealing device in coal mine, and they are also the important basis for the design of automatic hole sealing construction. Based on the radial sealing range of the slurry, the paper analyzes the sealing effect under different slurry pressure conditions by means of theoretical calculation and numerical simulation. Combined with the mechanical characteristics of the rubber Mooney-Rivlin model, extrusion seal and other principles, the optimal injection pressure and setting pressure are studied and determined. The results show that the radial sealing range of the slurry at …

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Beneficial Cbm Area Prediction Based On Structural Elemental Quantitative Cluster Classification, Liu Jing, Chang Suoliang, Liu Zuiliang, Zhang Sheng, Chen Qiang, Liu Bo Apr 2021

Beneficial Cbm Area Prediction Based On Structural Elemental Quantitative Cluster Classification, Liu Jing, Chang Suoliang, Liu Zuiliang, Zhang Sheng, Chen Qiang, Liu Bo

Coal Geology & Exploration

In order to select optimally the CBM-enriched area of structural elements and delicately divide the advantageous blocks of CBM structural control under the development scale, this paper takes the Yongle south block in the southwest of Qinshui Basin as an example, subdivides the structural characterization elements and quantifies the indicators of structural elements, and puts forward the method of trend surface iteration to characterize different degrees of structural deformation, fuzzy clustering classification and element dichotomy to optimize the favorable area of CBM structural control. Based on the comprehensive interpretation results of seismic geology, the quantitative characterization of structural elements of …

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