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Articles 2221 - 2250 of 6953
Full-Text Articles in Engineering
Efficient Treatment Technology Of Incrementally Open Water Gushing Channel Under Dynamic Water Conditions, Pu Zhiguo, Ding Xiang, Li Zhe, Ji Zhuochen, Yan Xin, He Xiaolang, Ma Jianguo
Efficient Treatment Technology Of Incrementally Open Water Gushing Channel Under Dynamic Water Conditions, Pu Zhiguo, Ding Xiang, Li Zhe, Ji Zhuochen, Yan Xin, He Xiaolang, Ma Jianguo
Coal Geology & Exploration
In Yushen mining area of Shaanxi Province, a blasting expansion fissure on the eastern side of the Xiwan Open-pit Coal Mine communicates the water-bearing body of burnt rock outside the pit, and an incrementally open water gushing channel with a length greater than 65 m is formed. The water volume gushing from burnt rock stabilizes at about 400 m3/h and the flow velocity is as high as 0.36 m/s, resulting in a series of problems in ecology, environmental protection, economy and safety. To block the water gushing channel and solve the problem as soon as possible, a quick …
Optimization Calculation Of The Width Of Waterproof Coal Pillars In Fault Zones Based On Spatial Relationship Between Coal Strata And Fault, Wu Bin, Xie Daolei, Han Jing, Chen Qiang, Zhang Huide
Optimization Calculation Of The Width Of Waterproof Coal Pillars In Fault Zones Based On Spatial Relationship Between Coal Strata And Fault, Wu Bin, Xie Daolei, Han Jing, Chen Qiang, Zhang Huide
Coal Geology & Exploration
The appropriate setting width of the waterproof coal pillars is an important measure to prevent water inrush hazard during near fault mining. The working face 123up01(south) of Jining No.3 Coal Mine in Shandong Province is adjacent to F8 fault in the west. The fall of F8 fault is large, which may be conducted with the Ordovician limestone aquifer at the bottom. To ensure the safe mining in the working face, it is necessary to calculate the size of waterproof coal pillars of fault F8. In view of the actual occurrence of coal strata, the spatial relationship between fault …
Numerical Simulation Of Azimuth Electromagnetic Wave Response Of Complex Geological Model Of Horizontal Hole In Coal Mines, Zhang Yi, Kang Zhengming, Feng Hong, Han Xue, Chen Gang
Numerical Simulation Of Azimuth Electromagnetic Wave Response Of Complex Geological Model Of Horizontal Hole In Coal Mines, Zhang Yi, Kang Zhengming, Feng Hong, Han Xue, Chen Gang
Coal Geology & Exploration
The advance and accurate identification of the coal-rock interface is one of the key technologies to realize automatic tunneling and intellectualization of coal mines. Azimuth electromagnetic wave tool has a large detection range and can distinguish the lithologic interface and interface orientation. It has been successfully applied in oilfield logging, but there are few researches on the coal mine measurement environment. In order to study the detection performance of azimuth electromagnetic wave logging in the complex 3D model of coal mines, the finite element numerical simulation method is used to investigate the influence of the drilling fluid in the borehole …
3d Forward Modeling Of Dc Resistivity Method Based On Finite Element With Mixed Grid, Wang Xinyu, Wang Cheng, Mao Yurong, Yan Liangjun, Zhou Lei, Gao Wenlong
3d Forward Modeling Of Dc Resistivity Method Based On Finite Element With Mixed Grid, Wang Xinyu, Wang Cheng, Mao Yurong, Yan Liangjun, Zhou Lei, Gao Wenlong
Coal Geology & Exploration
The DC resistivity method is widely used in the mineral resources exploration and geological survey industries because of its high efficiency and low cost, such as non-ferrous metals and coal fields. However, in the process of borehole–to–surface and surface–to–borehole resistivity method exploration, the influence of borehole factors (borehole fluid resistivity and borehole diameter) on the apparent resistivity response in different exploration modes is unclear, and whether it will affect the interpretation of apparent resistivity data is an issue worth exploring. Therefore, we proposed a mixed grid finite element method to realize the 3D forward modeling of DC resistivity. Then we …
Preliminary Investigation Of Uranium Resource Evaluation Method Based On Natural Gamma Logging Data：A Case Study Of The Pengyang Uranium Deposit In Ordos Basin, Yu Reng’An, Sun Dapeng, Zhou Xiaoxi, Deng Fan, Si Qinghong, Hu Yongxing
Preliminary Investigation Of Uranium Resource Evaluation Method Based On Natural Gamma Logging Data：A Case Study Of The Pengyang Uranium Deposit In Ordos Basin, Yu Reng’An, Sun Dapeng, Zhou Xiaoxi, Deng Fan, Si Qinghong, Hu Yongxing
Coal Geology & Exploration
“Coal and uranium exploration” and “oil and uranium exploration” are current research hotspots. Using logging data of coal and oilfield drilling to further evaluate uranium resources remains a difficult problem. Taking the Pengyang uranium deposit in the Ordos Basin as an example, this article explores the method of evaluating uranium resources based on natural gamma logging data. According to the remarkable features of the natural gamma anomaly response in the sandstone-type uranium reservoirs in the study area, the natural gamma logging regression model of the quantitative gamma logging value of the uranium deposit in the Pengyang area was studied by …
Study And Application On Multi Branch Point Sampling Drilling Technology Of Coal Seam Floor Borehole, Chu Zhiwei, Long Weicheng, Jia Bingyi, Liu Fei
Study And Application On Multi Branch Point Sampling Drilling Technology Of Coal Seam Floor Borehole, Chu Zhiwei, Long Weicheng, Jia Bingyi, Liu Fei
Coal Geology & Exploration
According to the technical requirements of long-distance gas parameter measurement, gas extraction borehole design guidance, and extraction evaluation for broken soft coal seam, the multi branch point sampling drilling method of coal seam floor borehole was proposedand its sampling drilling process was formulated on the basis of analyzing existing problems of sampling and drilling technology. Furthermore, the key drilling technologies such as accurate drilling trajectory control and “mechanical + hydraulic” efficient slag removal were developed. The equipment of drilling and sealed sampling were introduced. The application test was carried out in a coal mine in Suzhou, Anhui Province, in which …
Geological Structure Detection With Tunnel Transient Electromagnetic Kirchhoff 2d Migration Imaging, Qi Zhipeng, Guo Jianlei, Sun Naiquan, Li Xiu, Fan Yanan
Geological Structure Detection With Tunnel Transient Electromagnetic Kirchhoff 2d Migration Imaging, Qi Zhipeng, Guo Jianlei, Sun Naiquan, Li Xiu, Fan Yanan
Coal Geology & Exploration
The green construction of tunnel requires not only predicting disaster anomalies such as water inrush and mud inrush in front of tunnel face, but also identifying geological structure to support disaster warning and prevention. The traditional transient electromagnetic interpretation method can only provide resistivity information, which not meet the requirements of tunnel geological disaster management. Therefore, virtual wavefield imaging technology is introduced into the tunnel detection to achieve comprehensive interpretation of the electrical information and structures of disaster anomalies. Firstly, transient electromagnetic data is transformed into virtual wave field. Then, the resistivity imaging method was used to calculate the resistivity …
A Review：Geological Feasibility And Technological Applicability Of Underground Coal Gasification, Jiang Xiuming, Wu Caifang
A Review：Geological Feasibility And Technological Applicability Of Underground Coal Gasification, Jiang Xiuming, Wu Caifang
Coal Geology & Exploration
Underground coal gasification (UCG) is a potential new method of coal utilization, which is of great significance for alleviating China’s energy crisis, ensuring national energy security, and achieving carbon peaking and carbon neutrality goals. It has always been valued by countries all over the world. On the suitability of UCG resource conditions, the feasibility of process and technology, and the controllability of environmental impact, this paper summarizes the development status of UCG technology, and clarifies the coal resource reserves suitable for UCG technology, different standards of geological area selection and location selection technology, the development history and applicable conditions of …
Simplified Internal Variable Gradient Model For Zonal Disintegration Of Rocks In Circular Underground Tunnels, He Ziguang, Zhao Fasuo, Chen Haoxiang, Wu Bo, Zhou Jingjing
Simplified Internal Variable Gradient Model For Zonal Disintegration Of Rocks In Circular Underground Tunnels, He Ziguang, Zhao Fasuo, Chen Haoxiang, Wu Bo, Zhou Jingjing
Coal Geology & Exploration
As one of the typical nonlinear phenomena of deep level surrounding rock masses, zonal disintegration has captured many attentions of geotechnical engineers in the past years. On the basis of the internal variable theory, the closed-form analytical solutions to stress, strain and displacement fields near circular tunnels are obtained. The gradient-dependent solutions are compared with the results of the classical elasticity theory, and the effects of microstructures on the stresses and deformation fields are investigated as well. It is noted that the stress and deformation fields derived from the gradient model show remarkable quasi-periodicity and fluctuation, which is consistent with …
Powder Discharge Characteristics Of Pneumatic Double Pipe Directional Drilling In Broken Soft Coal Seams And Its Application, Nie Chao, Wang Yi, Yao Yafeng, Hong Jianjun
Powder Discharge Characteristics Of Pneumatic Double Pipe Directional Drilling In Broken Soft Coal Seams And Its Application, Nie Chao, Wang Yi, Yao Yafeng, Hong Jianjun
Coal Geology & Exploration
To study the influence of casing, casing bit size and casing rotational speed on pulverized coal discharge in double pipe directional drilling technology, three kinds of casing and casing bits in different sizes are designed respectively against the background of pneumatic double pipe directional drilling in the broken soft coal seam, the changes of the discharge rate and outlet velocity of pulverized coal under different combinations are analyzed, and the influence law of different casing rotational speeds on the suspension rate and conveying trajectory of pulverized coal are obtained. The numerical simulation results show that the ø120/96 mm casing with …
Ground Development Technology And Engineering Application Of Cbm In Coal Mine Goafs： A Case Study Of Jincheng Mining Area In Qinshui Basin, Zhou Xianjun, Li Guofu, Li Chao, Wang Zheng, Li Jiangbiao
Ground Development Technology And Engineering Application Of Cbm In Coal Mine Goafs： A Case Study Of Jincheng Mining Area In Qinshui Basin, Zhou Xianjun, Li Guofu, Li Chao, Wang Zheng, Li Jiangbiao
Coal Geology & Exploration
There are still rich CBM resources in goafs after coal mining, and the resource evaluation, development and utilization have dual significance of environmental protection and resources. In recent years, ground drilling has been actively explored in Jincheng, Xishan and Yangquan mining areas in Shanxi Province to extract CBM in the goafs. However, in the process of ground development of CBM, due to water accumulation in the goafs, confined water gushing from overlying strata and other reasons, there is no gas production or low gas extraction from ground drilling. Taking Yuecheng Coal Mine in Jincheng, Shanxi as an example, this paper …
Failure Analysis Of Deep Coal Seam Floor Considering Strain Softening Of Surrounding Rock And Formation Contact In Goaf, Yin Shangxian, Meng Haopeng, Qian Shuangbin
Failure Analysis Of Deep Coal Seam Floor Considering Strain Softening Of Surrounding Rock And Formation Contact In Goaf, Yin Shangxian, Meng Haopeng, Qian Shuangbin
Coal Geology & Exploration
In order to study the failure mode of the floor in deep coal seam mining, we proposed a FLAC3D finite difference numerical method considering the strain softening of surrounding rock and the contact of goafs .Through the qualitative analysis of Rankine’s earth pressure theory, the failure of the deep coal seam floor is studied based on the measured water conducting fracture zone of the floor in working face 2023 of Linxi Mine. The results show that the mechanical state of surrounding rock after plastic failure can be described more accurately by using the strain-softening constitutive relationship instead of the …
Temperature Field Analysis Of New Pipe Curtain Freezing Method In River Embankment Anti Seepage Reinforcement, Zhou Yuxuan, Hu Jun, Xiong Hui, Ren Junhao, Zhan Jianjian, Wang Zhixin
Temperature Field Analysis Of New Pipe Curtain Freezing Method In River Embankment Anti Seepage Reinforcement, Zhou Yuxuan, Hu Jun, Xiong Hui, Ren Junhao, Zhan Jianjian, Wang Zhixin
Coal Geology & Exploration
In order to explore whether the new pipe curtain freezing method can effectively strengthen the river embankment, this paper uses the finite element software to study the application of the new pipe curtain freezing method in anti-seepage and embankment reinforcement based on the temperature field, and sets up four analysis paths to deeply analyze the basic situation of the frozen soil curtain and the freezing effect characteristics of each path. The results show that the frozen soil curtain spreads around after it is formed at the freezing pipe. From the 8th day, the development of the frozen soil curtain on …
Table Of Contents, The Editors
Eefficient Fracturing Technology And Fine Drainage System Of Ultra-Deep Coalbed Methane In Southeast Chongqing：A Case Study Of Ny1 Well, Fang Dazhi, Cheng Zehu, Li Jiaxin
Eefficient Fracturing Technology And Fine Drainage System Of Ultra-Deep Coalbed Methane In Southeast Chongqing：A Case Study Of Ny1 Well, Fang Dazhi, Cheng Zehu, Li Jiaxin
Coal Geology & Exploration
According to the results of China’s new round of coalbed methane (CBM) resource evaluation, the CBM development mainly focuses on medium and shallow coal seams, and the geological conditions of deep-ultra deep coal reservoirs are more complicated. Thus, the reservoir fracturing technology and drainage management technology are two major factors in the development of CBM wells for deep coal reservoirs. In the area of southeast Chongqing, the coal seam of Longtan Formation is as deep as nearly 2 000 m, and there is no experience in ultra-deep CBM well development in this area. The NYI well is taken as an …
Identification Of Burning Temperature Of Burnt Rocks In Northern Shaanxi Based On Thermoacoustic Emission Technology, Sun Qiang, Wang Shaofei, Ge Zhenlong, Wei Shaoni, Ding Xiaoying
Identification Of Burning Temperature Of Burnt Rocks In Northern Shaanxi Based On Thermoacoustic Emission Technology, Sun Qiang, Wang Shaofei, Ge Zhenlong, Wei Shaoni, Ding Xiaoying
Coal Geology & Exploration
The identification of the burning temperature of burnt rocks has important guiding significance for the formation and evolution of burnt rocks. Based on the thermal Kaiser effect, the threshold temperature of burnt rock in Zhangjiamao, Shenmu, Northern Shaanxi Province is predicted through the acoustic emission (AE) acumulated energy and the changes of parameters RA (rise time/amplitude) and AF (average frequency) during heat treatment. The results show that the thermoacoustic emission characteristics of burnt rocks can effectively identify the burning temperature of burnt rocks, and it is basically consistent with the petrographic analysis of the temperature experienced by the burnt rocks. …
Impact Of The Ban On Illegal Mining Activities On Raw Water Quality: A Case-Study Of Konongo Water Treatment Plant, Ashanti Region Of Ghana, Sadique Anyame Bawa, Prince Antwi-Agyei, Martin Kyereh Domfeh
Impact Of The Ban On Illegal Mining Activities On Raw Water Quality: A Case-Study Of Konongo Water Treatment Plant, Ashanti Region Of Ghana, Sadique Anyame Bawa, Prince Antwi-Agyei, Martin Kyereh Domfeh
Journal of Sustainable Mining
The Government of Ghana prohibited Artisanal and Small-Scale Mining (ASM) operations from 2017 to 2018 as part of its strategy to address the socio-environmental issues caused by illegal mining activities, also referred to as “galamsey” operations. This study assessed the trend in the water quality of raw water abstracted at the Konongo Water Treatment Plant (WTP) for treatment before and after implementing the ban on “galamsey” operations. The main source of raw water for the Konongo WTP is the Anuru River. Secondary data on physicochemical water quality from 2006 to 2019 was sourced from the Konongo WTP and the Ashanti …
Improved Methodology For Monitoring The Impact Of Mining Activities On Socio-Economic Conditions Of Local Communities, Binay Prakash Pandey, Devi Prasad Mishra
Improved Methodology For Monitoring The Impact Of Mining Activities On Socio-Economic Conditions Of Local Communities, Binay Prakash Pandey, Devi Prasad Mishra
Journal of Sustainable Mining
Mining activities can cause tangible socio-economic improvements in the surrounding regions. Such potential has not been fully realized, owing to the fact that the socio-economic impact assessment processes exercised in India merely predict the footprint of industrial activity on the surrounding population. Consequently, project proponents are mandated to implement a management plan in cases of foreseeable negative consequences. However, both, the assessment study, as well as the process of implementation of a management plan, are riddled with significant gaps and limitations. Primary data collected for this research makes it apparent that, in comparison to the revenue generated from the mining …
A Proper Borehole Pattern Design For Coal Seam Methane Drainage In Tabas Coal Mine Using Comsol Multiphysics, Ali Bagherzadeh, Mehdi Najafi, Mohammad Fatehi Marji, Mehdi Noroozi
A Proper Borehole Pattern Design For Coal Seam Methane Drainage In Tabas Coal Mine Using Comsol Multiphysics, Ali Bagherzadeh, Mehdi Najafi, Mohammad Fatehi Marji, Mehdi Noroozi
Journal of Sustainable Mining
Optimizing the operational parameters of the borehole pattern in the coal seam includes the maximum amount of gas to be drained with the least amount of drilling, investment, and drainage time. The main purpose of this research is to properly design the drainage borehole pattern in the C1 coal seam of the Tabas coal mine. In this research, the Comsol Multiphysics software was used for numerical modeling of the boreholes. According to the method of diffusion of methane gas in a coal seam, the reduction of methane gas concentration and the amount of gas released from the coal blocks were …
Hydrodynamic Limitations To Mangrove Seedling Retention In Subtropical Estuaries, Kelly M. Kibler, Christian Pilato, Linda Walters, Melinda Donnelly, Jyotismita Taye
Hydrodynamic Limitations To Mangrove Seedling Retention In Subtropical Estuaries, Kelly M. Kibler, Christian Pilato, Linda Walters, Melinda Donnelly, Jyotismita Taye
Flow-biota Interaction and Natural Infrastructure Design
Mangrove forest sustainability hinges upon propagule recruitment and seedling retention. This study evaluates biophysical limitations to mangrove seedling persistence by measuring anchoring force of two mangrove species (Rhizophora mangle and Avicennia germinans). Anchoring force was measured in 362 seedlings via lateral pull-tests administered in mangrove forests of two subtropical estuaries and in laboratory-based experiments. Removal mechanism varied with seedling age: newly-established seedlings failed due to root pull-out while seedlings older than 3 months failed by root breakage. Anchoring force of R. mangle seedlings was consistently and significantly greater than A. germinans (GLM: p = 0.002), however force to …
Ecological Risk Assessment For Coal Combustion Residuals And Herrington Lake Adjacent To The Kentucky Utilities E.W. Brown Generating Station, Mary Sorensen, Alex Smith, Mark Nielsen
Ecological Risk Assessment For Coal Combustion Residuals And Herrington Lake Adjacent To The Kentucky Utilities E.W. Brown Generating Station, Mary Sorensen, Alex Smith, Mark Nielsen
World of Coal Ash Proceedings
No abstract provided.
Epri Research On Groundwater-Surface Water Interactions Near Coal Combustion Product Sites, Bruce Hensel, Jeff Thomas, Tim Towey, Anthony Aufdenkampe
Epri Research On Groundwater-Surface Water Interactions Near Coal Combustion Product Sites, Bruce Hensel, Jeff Thomas, Tim Towey, Anthony Aufdenkampe
World of Coal Ash Proceedings
No abstract provided.
Cqa - A Common Sense Approach At Becoming The Mvp On Your Next Project, James Price, Michael Fisher, John Metcalf
Cqa - A Common Sense Approach At Becoming The Mvp On Your Next Project, James Price, Michael Fisher, John Metcalf
World of Coal Ash Proceedings
No abstract provided.
Challenges & Pragmatic Solutions For The Design And Construction Of A 300-Acre Ccr Landfill Located In The Southwestern Us - A Case Study, Andy Lucas, Jason Pokorny
Challenges & Pragmatic Solutions For The Design And Construction Of A 300-Acre Ccr Landfill Located In The Southwestern Us - A Case Study, Andy Lucas, Jason Pokorny
World of Coal Ash Proceedings
No abstract provided.
State Of The Practice For Compaction Quality Of Dry Stack Ccr Storage Facilities, Bruce Cunningham, Pavana Vennapusa, David J. White, Robert Eric Hageman
State Of The Practice For Compaction Quality Of Dry Stack Ccr Storage Facilities, Bruce Cunningham, Pavana Vennapusa, David J. White, Robert Eric Hageman
World of Coal Ash Proceedings
No abstract provided.
Groundwater Compliance & Strategy Insights For Ccr Rule Stakeholders, Sheryl Smith, Mark Johnson
Groundwater Compliance & Strategy Insights For Ccr Rule Stakeholders, Sheryl Smith, Mark Johnson
World of Coal Ash Proceedings
No abstract provided.
Hybrid Closure Approach: Constructing Bidding Lessons Learned, Brian Harthun, P.E.
Hybrid Closure Approach: Constructing Bidding Lessons Learned, Brian Harthun, P.E.
World of Coal Ash Proceedings
No abstract provided.
Ccr Landfill Construction & Operation Under Subtitle D, Thomas R. Gredell
Ccr Landfill Construction & Operation Under Subtitle D, Thomas R. Gredell
World of Coal Ash Proceedings
No abstract provided.
Hybrid Closure Approach: Design Investigation Review, Brian Sperrazza, P.E., P.G.
Hybrid Closure Approach: Design Investigation Review, Brian Sperrazza, P.E., P.G.
World of Coal Ash Proceedings
No abstract provided.
Geochemical Explanations For Strong Natural Attenuation Of Molybdenum, Selenium, And Lithium In A Groundwater Plume, Jacob Chu, J. P. Brandenburg
Geochemical Explanations For Strong Natural Attenuation Of Molybdenum, Selenium, And Lithium In A Groundwater Plume, Jacob Chu, J. P. Brandenburg
World of Coal Ash Proceedings
No abstract provided.