Engineering Commons^™

Slippage Effect And The Seepage Mechanism Considering The Compaction And Embedding Action Of Proppant, Cheng Qiaoyun, Li Bobo, Li Jianhua, Gao Zheng, Wang Bin

Coal Geology & Exploration

Hydraulic fracturing technology is an effective method to improve the efficiency of coalbed methane drainage, but the universal embedding of proppant under stress will change the width of the fractures, which will affect the gas slippage effect and the permeability mechanism. In order to explore the gas slippage effect and coal seepage law under the background of hydraulic fracturing, the Hertzian contact theory is used to quantify the embedding depth of proppant, and the gas slippage coefficient calculation equation and permeability model of the combined effect of proppant and effective stress are constructed. The results show that under different gas …

Study On P-Wave Velocity And Mechanical Response Characteristic Of Rock In Coal Seam Roof With Supercritical Co2 Injection, Chen Chen, He Xingyi, Niu Qinghe, Yu Hongxu, Xie Xiangyu

Coal Geology & Exploration

Deep coal seam CO₂ geological sequestration and enhanced CH₄ recovery(CO₂-ECBM) can both increase CBM recovery and achieve carbon emission reduction, possessing dual benefits of energy and environment. The geochemical reactions between supercritical CO₂(ScCO₂), water and coal seam roof can change its physical-mechanical properties and increase the risk of CO₂ leakage. In this paper, taking the roof rock of No.3 coal seam in Hudi Mine from Qinshui Basin as the research area, the ScCO₂-water-rock geochemical reaction simulation experiment was carried out to explore the geochemical reaction process of ScCO_{2 …}

Adsorption Phase Density Characteristics Of Supercritical Methane Of Granular Coal, Zhang Mingjie, Liu Hao, Jia Tianrang, Gong Ze, Yang Mingxin

Coal Geology & Exploration

Finding out the characteristics of supercritical methane adsorption phase density of granular coal is the basis of studying the influence of temperature and pressure on methane adsorption amount of coal sample. Granular coal samples collected from Hebi No.6 Mine and Longshan Mine in Anyang-Hebi Coalfield were used to measure the isothermal adsorption lines at temperatures of 308 K, 313 K and 318 K, and pressures of 1-24 MPa by magnetic suspension balance isotherm adsorption device. The intercept method, Langmuir ternary model fitting method and liquid phase density method were used to calculate the adsorbed phase density at adsorption saturation and …

Mine Water Inflow Modes And Scientific Design Of Drainage Boreholes In Roof Confined Aquifer Of Coal Seam, Hu Weiyue, Ji Yadong, Huang Huan

Coal Geology & Exploration

Aiming at the uncertainty of mine water inflow mode, this paper analyzes the spatiotemporal variation characteristics of mine water inflow at first, and get a conclusion that the mine water is composed of static storage and dynamic recharge. And the static storage is mainly affected by weighting interval, the aquifer thickness of caving and fracture zone height and specific yield; the dynamic recharge is mainly affected by caving and fracture zone height and specific yield, hydraulic gradient in permeable flow field and discharge section area. According to the spatial relationships between water conducted fissure and roof aquifer of coal seam, …

Optimization Of Regional Advanced Coal Floor Water Hazard Prevention And Control Technology And Its Application, Zheng Shitian, Ma Hewen, Ji Yadong

Coal Geology & Exploration

In order to optimize the grouting process, improve the effect of the technology, and promote its application, this paper presents an investigation on the application of the regional advanced coal floor water hazard prevention and control technology in Huaibei mining area. The investigation shows that the pressure control in low pressure diffusion and medium pressure strengthening stages plays a major role in controlling the total grouting volume, which directly affects the limestone aquifer reformation. The prediction formula for grouting volume for strata with different karst fractures can provide guidance to the grouting engineering design. In addition, the horizontal layout method …

Performance Deterioration Law Of Retarded Cement Slurry And Its Mixed Slurry In Freezing Borehole Mud Replacement, Li Qiang, Wang Yansen, Wang Chunlin, Xu Shengji, Fan Zhiqiang

Coal Geology & Exploration

The mud replacement of freezing hole has become a necessary part of freezing shaft sinking in rock strata, but in the lowering process, the freezing pipe is prone to excessive slurry viscosity resistance, and even be locked, leading to borehole failure. In order to deeply understand the performance deterioration law of cement slurry and its mixture in deep hole environment, the laboratory tests of retarded cement slurry and mixed slurry are carried out respectively, taking the apparent viscosity as the measurement index and considering the factors such as curing time, temperature, water loss state and volume ratio of mixed slurry. …

Friction Law Of Compound Drilling Along The Coal Seam With Super-Long Directional Drilling, Xu Chao, Jiang Lei, Wang Xian, Fang Jun, Chen Pan, Liu Zhi

Coal Geology & Exploration

The internal friction is the main factor affecting the drilling rate and drilling efficiency in super-long directional drilling in coal mines. In order to meet the objective demand of gas drainage mode in big panels, the friction and its influence law in drilling process are studied. To provide a basis for the selection of friction reduction process parameters of compound drilling along coal seam with super-long directional drilling, the drill string motion characteristics and stress state under the condition of near-horizontal compound drilling in the coal mine are analyzed. With certain conditional assumptions, the mechanical models of axial frictional resistance …

Application Of Air Foam Composite Directional Drilling Technology In Broken Soft Coal Seams, Liu Jianlin, Fang Jun, Chu Zhiwei, Yang Weifeng

Coal Geology & Exploration

In order to meet the requirements of air screw motor cooling and lubrication, coal dust removal treatment at the orifice and water outlet disposal in the air directional drilling, an air foam composite directional drilling technology for broken soft coal seams has been developed based on the analysis of drilling slag migration characteristics of air directional drilling. The key technologies such as stable and efficient foaming, "mechanical + foam" composite slag discharge and "air + foam" composite drilling were integrated. The technology was also equipped with directional drillrig, foam generation perfusion system, air screw motor, special-shaped drill pipe and measurement …

Determination Of The Stress-Strain State Of Rock Mass And Zone Of Inelastic Deformation Around Underground Mine Excavation Using Modern Methods Of Numerical Modelling, Sergey A. Ignatiev, Aleksandr E. Sudarikov, Askar Zh. Imashev

Journal of Sustainable Mining

The paper reviews methods and trends of numerical modelling of geomechanical processes around underground mine excavations. The most rational method of determining the additional stresses caused by the mine excavations is chosen. Mathematical modelling was performed for excavations of various cross sections and different strength of rocks. The dimensions of the inelastic deformation zone around the mine excavations have been identified. The area of the total fracture zone around the excavation, as well as the area of the roof fracture zone are calculated. The results of the fracture zone modelling are presented both as coordinates and in a graphical form. …

Rapid Selection Of Moving Wagons In The Sequence Of Video Frames Based On The Method Of Calculating The Optical Flow, Bahodir Muminov Prof.

Bulletin of TUIT: Management and Communication Technologies

With the advent of digital video cameras, it has become possible to process measurement data using a computer, which has led to a wide range of new tasks in digital signal processing. Examples of such tasks are perimeter observation and detection of a moving object, recognition of a moving object, and identification of an object. Research and development of algorithms for processing video data, as a rule, requires a time-consuming computational experiment on model and real data of a large volume. Therefore, it is important to correctly organize the computational process when modifying and testing algorithms.

Thin Safety Margin: The Sefor Super-Prompt-Critical Transient Experiments, Ozark Mountains, Arkansas 1970–1971, Jerry Havens, Collis Geren

Arkansas Scholarly Editions

Thin Safety Margin charts the history of SEFOR, a twenty-megawatt reactor that operated for three years in the rural Ozark Mountains of Arkansas as part of an internationally sponsored program designed to demonstrate the Doppler effect in plutonium-oxide-fueled fast reactors. Authors Jerry Havens and Collis Geren draw upon this history to assess the accidental explosion risk inherent in using fast reactors to reduce the energy industry’s carbon dioxide emissions.

If a sufficiently powerful fast-neutron explosion were to cause the containment of a reactor such as SEFOR’s to fail, the reactor’s radiotoxic plutonium fuel could vaporize and escape into the surrounding …

Socio-Ecological Analysis Of Artisanal Gold Mining In West Africa: A Case Study Of Ghana, Richard Takyi, Rasha Hassan, Badr El Mahrad, Richard Adade

Journal of Sustainable Mining

The surge in artisanal gold mining (AGM) activities and the associated environmental impact in Ghana have elicited several stakeholders' attempts to curb the problem. However, due to little understanding of the underlying issues, these efforts have been ineffective. This study aims to use a socio-ecological framework to analyze drivers of AGM activities, the environmental pressures, the state change, their impact on human welfare, and the management response as measures (DAPSI(W)R(M)) to the problem. Evaluate AGM's impact on Ghana's ability to achieve the United Nations Sustainable Development Goals (SDGs). Data were collected from relevant literature on the subject and analyzed with …

Growth Of Invasive Plant Species Communities As A Substantial Issue In Post-Mining Land Development, Paweł Olszewski

Journal of Sustainable Mining

This article concerns the issue of the appearance and growth of invasive plant species in land degraded by hard coal mining and the repercussions of this process, particularly in the context of land reclamation. These species, such as Canadian goldenrod or Japanese knotweed, which nearly always form extensive and monocultural patches of vegetation, contribute to the displacement of both native species and those introduced as part of biological restoration. In 2015, the Central Mining Institute in Katowice prepared a land development concept for a part of the area of the former KWK Paryż mine in Dąbrowa Górnicza (Upper Silesian Industrial …

Microscopic Diffusion Characteristics Of Linear Alkylbenzene Sulfonates On The Surface Of Anthracite: The Influence Of Different Attachment Sites Of Benzene Ring In The Backbone, Xuanlai Chen, Guochao Yan, Xianglin Yang, Guang Xu, Shuai Wei

Mining Engineering Faculty Research & Creative Works

In order to explore the effect of the attachment site of the benzene ring in the backbone of the surfactant on its diffusion characteristics on the surface of anthracite, the molecular dynamics simulation method was used, and the four isomers (m-C16, m = 2,4,6,8; m represents the attachment site of the benzene ring in the backbone) of sodium hexadecyl benzene sulfonate (SHS) were selected. Binary models of surfactant/anthracite, surfactant/graphene modified by oxygen-containing functional groups, and a ternary model of water/surfactant/anthracite were constructed. By analyzing a series of properties such as interaction energy, contact surface area, relative concentration distribution, radial distribution …

The Factors Impacting The Incorporation Of The Sustainable Development Goals Into Raw Materials Engineering Curricula, Dimitris Damigos, George Valakas, Anna Gaki, Katerina Adam

Journal of Sustainable Mining

It is widely recognised and acknowledged that the mining industry, if properly operating and managed, has the potential to positively contribute to “The 2030 Agenda for Sustainable Development”. In this direction, the Raw Materials (RM) engineering education possesses a crucial role, given the need to instil in tomorrow’s mining engineers the sustainability principles. This paper explores the educational needs of the Greek RM sector and the factors constituting the RM whole value chain SDGs-education-innovation eco-system. The research follows a two-stage focus group approach. First, the perceptions, opinions and beliefs of invited stakeholders were explored in the context of semi-structured interviews. …

The Behaviour Of Rare Earth Elements From South African Coal Fly Ash During Enrichment Processes: Wet, Magnetic Separation And Zeolitisation, Mero Lee Ursula Cornelius, Alechine Emmanuel Ameh, Chuks Paul Eze, Olanrewaju Fatoba, Asel Sartbaeva, Leslie Felicia Petrik

Mining Engineering Faculty Research & Creative Works

Rare earth elements (REEs) are essential raw materials in a variety of industries including clean energy technologies such as electric vehicles and wind turbines. This places an ever-increasing demand on global rare earth element production. Coal fly ash (CFA) possesses appreciable levels of REEs. CFA, a waste by-product of coal combustion, is therefore a readily available source of REEs that does not require mining. CFA valorization to zeolites has been achieved via various synthesis pathways. This study aimed to evaluate one such pathway by monitoring how REEs partition during CFA processing by the wet, magnetic separation process and zeolitisation. South …

Effect Of Shock Vector/Polarization Vector Configuration On The Generation Of Ultrahigh Voltage By Adiabatically Compressed Ferroelectric Materials, Sergey I. Shkuratov, Jason Baird, Vladimir G. Antipov

Mining Engineering Faculty Research & Creative Works

Compact autonomous megawatt-power systems based on shock depolarization of ferroelectric materials are capable of producing kiloampere currents and ultrahigh-voltage pulses with amplitudes exceeding 100kV. Herein, we report the results of experimental investigations of the generation of ultrahigh voltage by poled Pb0.99(Zr0.95Ti0.05)0.98Nb0.02O3 and Pb0.99(Zr0.52Ti0.48)0.98Nb0.01O3 ferroelectrics subjected to shock loading at different shock vector/polarization vector configurations. Our experiments demonstrated that under loading perpendicular to the polarization vector (transverse stress mode) the ferroelectrics are capable of generating high voltages exceeding 400kV, while the loading parallel to the polarization vector (longitudinal stress mode) causes a distortion of the depolarization process in ferroelectrics of large …

Experimental Study On Advanced Real Time Detection System Of Seismic-While-Excavating, Wang Ji, Qin Si, Wu Hai, Zhang Qingqing, Yu Junhui, Su Xiaoyun

Coal Geology & Exploration

Experimental study on advanced real time detection system of seismic-while-excavating

Three-Component Seismic Data Acquisition System Of Coal Mine Based On Mems And Lwip, Wang Huaixiu, Qiu Shuai, Zhu Guowei, Chen Bo

Coal Geology & Exploration

Three-component seismic data acquisition system of coal mine based on MEMS and LwIP

Depth Correction Technique Of Electrical Marker Based On Electrical Field Component Of Csamt, Liu Zuiliang, Zhang Fenxuan, Zhang Jifeng, Zhou Guangyu, Zhao Hui, Zhang Xin

Coal Geology & Exploration

Depth correction technique of electrical marker based on electrical field component of CSAMT

Evaluation On The Resolution Ability Of Underground Transient Electromagnetic Instrument To Disaster-Causing Water Bodies, Zhao Zhongnan, Xu Yangcheng, Wu Yanqing, Tan Qingqing, Kang Yueming, Wang Yao

Coal Geology & Exploration

Evaluation on the resolution ability of underground transient electromagnetic instrument to disaster-causing water bodies

Research Status And Prospect Of Fault Activation Under Coal Mining Conditions, Tian Yutong, Zhang Pingsong, Wu Rongxin, Liu Chang

Coal Geology & Exploration

Research status and prospect of fault activation under coal mining conditions

Key Problems And Countermeasures Of Cbm Development Through Surface Boreholes In Abandoned Coal Mines Of Shanxi Province, Wang Zheng, Li Guofu, Zhou Xianjun, Hu Shengyong, Li Rifu, Chen Wenke, Jiao Pengshuai, Li Chao, Li Jiangbiao

Coal Geology & Exploration

Key problems and countermeasures of CBM development through surface boreholes in abandoned coal mines of Shanxi Province

Technology Of Across-Goaf Drainage Of Coalbed Methane From A Lower Coal Seam Group And Its Primary Application: Taking Sihe Mine Field As An Example, Li Junjun, Li Guofu, Hao Haijin, Hao Chunsheng, Wang Zheng

Coal Geology & Exploration

Technology of across-goaf drainage of coalbed methane from a lower coal seam group and its primary application: Taking Sihe mine field as an example

Coal Body Structure Identification By Logging Based On Coal Accumulation Environment Zoning And Its Application In Mabidong Block, Qinshui Basin, Zhang Jianguo, Han Sheng, Zhang Cong, Chen Yanjun

Coal Geology & Exploration

Coal body structure identification by logging based on coal accumulation environment zoning and its application in Mabidong Block, Qinshui Basin

Sequence Stratigraphy And Coal Accumulation Of Barrier Coastal System Under Epicontinental-Sea Environment: A Case Study Of The Late Paleozoic Taiyuan Formation In Bohai Bay Area, Chang Jia, Chen Shiyue, Wang Qiong, Pu Xiugang, Yang Huaiyu

Coal Geology & Exploration

Sequence stratigraphy and coal accumulation of barrier coastal system under epicontinental-sea environment: A case study of the Late Paleozoic Taiyuan Formation in Bohai Bay Area

Distribution Characteristics Of Heavy Minerals In The Sandstone Of Zhiluo Formation Of Northern Ordos Basin And Its Implication, Zhang Yuanyuan, Zhang Pengfei, Nie Fengjun, Yan Pengbing, Zhang Zhibo, Yan Zhaobin, Zhang Xin

Coal Geology & Exploration

Distribution characteristics of heavy minerals in the sandstone of Zhiluo Formation of northern Ordos Basin and its implication

Mechanism And Applicability Of Increasing Coalbed Methane Well Production By Pre-Positioned Acid Fracturing, Fan Yao

Coal Geology & Exploration

Mechanism and applicability of increasing coalbed methane well production by pre-positioned acid fracturing

Effects Of Different Combined Pretreatments On Biogenic Methane Production By Anaerobic Digestion Of Lignite, Zhang Huaiwen, Yao Yiqing, Xie Changwen

Coal Geology & Exploration

Effects of different combined pretreatments on biogenic methane production by anaerobic digestion of lignite

Construction And Application Of "Eight In One" Closed-Loop Management And Control Mode Of Roof Water Disaster In Coal Mines, Liu Qingbao, Ding Xiang, Feng Jie, Zhang Kun

Coal Geology & Exploration

Construction and application of "eight in one" closed-loop management and control mode of roof water disaster in coal mines