Engineering Commons^™

Validity Analysis Of Flow Field Method In Detecting Seepage Vector Distribution Of Earth-Rock Dam, Dai Qianwei, Cui Yongsheng, Han Xingjin, Lei Yi, Li Jiepeng, Zhu Zelong

Coal Geology & Exploration

Based on the similarity between the electric potential differential control equations of the current field and velocity potential differential control equations of the seepage field, the flow field method(FFM) can not only determine the seepage by measuring the distribution of current field, but also can efficiently figure out the leakage location of the dam. For further discovering the vector distribution and direction of seepage more accurately, the horizontal and vertical potential difference between the upstream and the downstream can be measured to simulate the vector distribution of seepage. In this paper, we illustrate the principle of vector flow field method(VFFM) …

The Main Progress In The 13Th Five-Year Plan And The Prospect Of Coal Geology, Jia Jiancheng, Gong Zewen, Jin Dewu, Li Quanxin, Wu Yan

Coal Geology & Exploration

Based on the brief analysis the evolution of "coal geology", the main progress of discipline in basic theoretical research, geological guarantee technology, coal and rock detection during the 13th five-year Plan period is reviewed emphatically, meanwhile the main problems faced and the development direction in the 14th five-year plan period and even a longer period of time are pointed out. It is considered that coal geology should around the development goals of coal industry of "providing sufficient green coal" and "reducing geological disasters in coal mine", taking the key geological theories and technical bottlenecks in green coal exploration, precise intelligent …

Sequence-Paleogeography And Coal Accumulation Of Lopingian In Guizhou Province, Shao Longyi, Hua Fanghui, Yi Tongsheng, Guo Lijun, Wang Xuetian

Coal Geology & Exploration

Based on outcrop sections and borehole data, the sequence stratigraphy, paleogeography, and coal accumulation of Lopingian(Upper Permian) in Guizhou Province have been studied. According to distribution of marine limestone beds which reflects variation of the transgressions, we have subdivided the Lopingian into 3 third-order composite sequences(CSⅠ, CSⅡ, CSⅢ) and related lowstand, transgressive, highstand sequence sets. CSⅠcorresponds to the lower and middle parts of the Lower Member of Longtan Formation. CSⅡcorresponds to the upper part of the Lower Member of Longtan Formation. CSⅢcorresponds to upper part of the Upper Member of Longtan Formation and Changxing Formation. The paleogeography map of these …

Numerical Simulation Of Pore Structure Stress Characteristics Of Coal And Rock Mass, Wang Gang, Jiang Chenghao, Chen Xuechang

Coal Geology & Exploration

In order to explore the stress distribution around the pores of coal and rock mass under different loading modes, the skeleton model of coal and rock mass with different pore shapes was constructed through CT three-dimensional reconstruction technology, and uniaxial and triaxial compression experiment simulations were conducted using ABAQUS software. The results showed that under uniaxial compression, the upper and lower regions of spherical pores showed tensile stress concentration, while the left and right regions showed compressive stress concentration. The stress concentration types in the long and short axis of elliptic pores were distinct with different dip angles. Under uniaxial …

Study On The Optimization Of Well Location And Extraction Life In Mining Disturbed Zone Of Yuecheng Mine In Jincheng, Wu Xi, Li Guofu, Wang Zheng, Fu Junhui, Zheng Fei, Zhou Xianjun

Coal Geology & Exploration

The aim of the study is to reduce the coalbed gas accumulation in the upper corner caused by U-type ventilation in the working face of Yuecheng Coal Mine, Jincheng City, and improve the production and extraction life of coalbed methane surface wells in the mining disturbed area and goaf. Based on the research of surface mining test wells in Chengzhuang Mine and Sihe Mine, and taking the geological conditions of coalbed methane in Yuecheng Coal Mine as the engineering design basis, this paper puts forward that the well location in the surface mining disturbed area should be close to the …

Thoughts On Mine Water Control And Treatment In Yushen Mining Area, Fan Limin, Sun Kui, Li Cheng, Ning Kuibin, Ji Ruijun

Coal Geology & Exploration

In order to scientifically explain the water gusting(bursting) events with large water inflow in Yushen mining area and provide basic information for mine water control and treatment, this paper analyzes the water bursting events and large mine water gusting situations in recent years, and questions such as formation mechanism of large water inflow in mine, hydrogeological property of red soil layer and accuracy of mine inflow prediction are put forward. It expounds how to break through the "mine field" scope and study groundwater system and water bursting source in terms of regions and focus on weakly water-rich aquifers such as …

Experimental Study On Dynamic Prediction Of Coal Seam Floor Elevation In Heading Face, Liu Wenming, Cheng Jianyuan, Liu Zaibin, Zhang Zeyu

Coal Geology & Exploration

Speedy drivage urgently needs to build a high-precision two-dimensional geological model. Taking the XY-S working face of Qinshui coalfield as an example, based on the results of 3D seismic interpretation, the coal seam floor elevation measured during excavation is used to update in succession the 3D seismic average velocity field and the coal seam floor elevation ahead, thus the prediction accuracy ahead of heading is analyzed statistically. The results show that the error between the predicted coal seam floor profile and the actual exposed profile decreases gradually by constantly making use of the measured coal seam floor elevation, upgrading the …

Research Progress Of Drilling And Borehole Completion Technologies In Broken Soft Coal Seam In Underground Coal Mine, Wang Li, Yao Ningping, Yao Yafeng, Wang Yi, Zhang Jie, Fang Jun, Wei Hongchao

Coal Geology & Exploration

In China, broken soft coal seams are in many strata and widely distributed. It is generally characterized by complex tectonic stress, high gas pressure, low mechanical strength and poor permeability, therefor, the hole is easy to collapse, outburst, which will probably cause many problems such as drilling difficulties, frequent accidents in the hole, inadequate hole depth, borehole blockage, drainage blind area and so on. With the continuous increase of coal mining depth, it is more difficult for drilling and completion in broken soft coal seam. Therefore, the high efficiency, deep hole and precise drilling technology, as well as the completion …

Removal Of Pharmaceutical Residues From Water And Wastewater Using Dielectric Barrier Discharge Methods—A Review, Emile S. Massima Mouele, Jimoh O. Tijani, Kassim O. Badmus, Omoniyi Pereao, Omotola Babajide, Cheng Zhang, Tao Shao, Eduard Sosnin, Victor Tarasenko, Ojo O. Fatoba, Katri Laatikainen, Leslie F. Petrik

Mining Engineering Faculty Research & Creative Works

Persistent pharmaceutical pollutants (PPPs) have been identified as potential endocrine disruptors that mimic growth hormones when consumed at nanogram per liter to microgram per liter concentrations. Their occurrence in potable water remains a great threat to human health. Different conventional technologies developed for their removal from wastewater have failed to achieve complete mineralization. Advanced oxidation technologies such as dielectric barrier discharges (DBDs) based on free radical mechanisms have been identified to completely decompose PPPs. Due to the existence of pharmaceuticals as mixtures in wastewater and the recalcitrance of their degradation intermediate by-products, no single advanced oxidation technology has been able …

Blowing Curtain Face Ventilation System For Extended Cut Mining Using Passive Regulator, Andrzej M. Wala, Todor P. Petrov

Mining Engineering Faculty Patents

A ventilation system for an underground mine includes a blowing curtain, a passive regulator in a shape of an airfoil and an airflow ventilation source. The passive regulator is positioned in the air path adjacent a discharge end of the blowing curtain.

The Acoustic Camera As A Tool To Identify Belt Conveyor Noises, Piotr Bortnowski, Anna Nowak-Szpak, Maksymilian Ozdoba, Robert Król

Journal of Sustainable Mining

This paper explores the possibilities of using an acoustic camera as a tool that allows the verification of the correct construction and operation of individual elements of a belt conveyor. Based on the simultaneously recorded components - a video camera and measuring microphones, the sound pressure level map of the belt conveyor was created. The tests were carried out in laboratory conditions and covered the location and identification of individual noise sources. The verification consists not only of searching for dominant sound sources, but above all, of searching for frequencies in the analysed spectrum that should not occur during their …

Optimization Of The Distribution Of Drilling Boreholes In Methane Production From Coal Seams, Anna Wątor, Jarosław Chećko, Tomasz Urych

Journal of Sustainable Mining

The paper presents an evaluation of methane production from coal seams. The Warszowice-PawłowicePółnoc deposit was selected for numerical modelling of methane production. The numerical model was made for a fragment of this deposit of about 2 km². The numerical model was constructed for 6 seams. Three deposits were selected for simulation of methane production. Three horizontal boreholes were designed within the model area, referring to the existing Suszec-19 borehole. A number of simulations related to methane production from the selected deposits were performed. They included different variants of the number of boreholes and also took into account the …

A Systematic Review Of The Use Of Environmental Economics In The Mining Industry, Maria Menegaki, Dimitris Damigos

Journal of Sustainable Mining

Environmental economics is increasingly being used in project appraisals, environmental liability estimates and design of market-based instruments. Mining, an actor capable of causing adverse effects on the environment, human health and well-being, has already been affected by these developments, at a great extent. Up to date, several research studies have been carried out to monetise the externalities of mining projects. Nevertheless, a systematic review of these publications has not been carried out, yet. This paper aims to fill this gap in the literature by investigating (i) the main non-market valuation techniques used; (ii) the main external costs or benefits of …

Covid-19: A Spectio-Temporal Analysis Of Air Quality Status In Coking Coalfields Of India Due To Nationwide Lockdown In India, Amarjeet Singh Mr., Gurdeep Singh Dr.

Journal of Sustainable Mining

A novel infectious corona virus disease (COVID-19) was identified in month of December 2019.It has now been announced as a worldwide pandemic by the World Health Organization [1]. The COVID-19 pandemic has positive impacts on the environmental pollutants. In present work, Coalfield areas of Jharia Coalfields (JCF), India have been taken as a case study to evaluate the effect of lockdown on air quality at 10 locations. This study had been selected to estimate the reduction in concentration of pollutants like PM₁₀, PM_2.5, SO₂, and NOx during 3 Seasons (summer, Post-Monsoon and winter season) …

Assessment Of Heavy Metal Concentration In Soils Around Geita The Gold Mine, Tanzania, Mariam G. Mgendi, Mkabwa L. K Manoko, W.J.S. Mwegoha, C. Southway C. Southway

Journal of Humanities and Social Sciences

Health issues related to gold mining cannot be underestimated. Gold mining produce acid mine drainage (AMD), which in turn releases heavy metals into the nearby environment, hence causing environmental pollution. Heavy metals are naturally very toxic, thus pose a great health concern especially when their concentration exceeds the recommended permissible limits. In this study, concentrations of five heavy metals—including Pb, Ni, Cr, Cu and Zn—were assessed in the soil around Geita Gold Mine (GGM). A total of 17 sampling sites were established from which the soil samples were collected at 0-15cm and 15-30cm soil depth. The concentration of both total …

Evaluation Of Undeveloped Hard Coal Deposits And Estimation Of Hard Coal Reserves In The Upper Silesian Coal Basin, Poland, Tomasz Urych, Jarosław Chećko, Marek Rosa, Anna Wątor

Journal of Sustainable Mining

The article presents the results of works concerning evaluation of undeveloped deposits in the Upper Silesian Coal Basin and an estimation of hard coal reserves which can be developed by 2050. Evaluation of hard coal deposits was established on criterions choice and their score determination. On the basis of obtained the final score and after consultations with experts in the field of hard coal mining, there were selected three areas of undeveloped deposits with the amount of about 1.99 Gt (billion metric tons) of anticipated economic resources which can extend the coal reserve base located in the direct vicinity of …

A Water Quality And Contaminant Source Assessment Of Arbuckle Creek In Fayette County, West Virginia, Sarah Ashby Simonton

Theses, Dissertations and Capstones

Arbuckle Creek, located in Minden, West Virginia, is a stream that runs through Oak Hill, WV and is characterized by the presence of the Oak Hill Wastewater Treatment Plant and the history of the contamination of polychlorinated biphenyl (PCBs) from the copious amount of contamination from the Shaffer Equipment Site and the pollution from mining completed in the area throughout the 1900’s. In order to assess the reaches of the current water quality, samples were collected and assessed for benthic macroinvertebrates, water parameters, benthic algae, and habitat. This was accomplished using the West Virginia Department of Environmental Protection (WVDEP) agency’s …

A Methodology For Autonomous Roof Bolt Installation Using Industrial Robotics, Anastasia Xenaki

Theses and Dissertations--Mining Engineering

The mining sector is currently in the stage of adopting more automation, and with it, robotics. Autonomous bolting in underground environments remains a hot topic for the mining industry. Roof bolter operators are exposed to hazardous conditions due to their proximity to the unsupported roof, loose bolts, and heavy spinning mass. Prolonged exposure to the risk inevitably leads to accidents and injuries.

The current thesis presents the development of a robotic assembly capable of carrying out the entire sequence of roof bolting operations in full and partial autonomous sensor-driven rock bolting operations to achieve a high-impact health and safety intervention …

Celestite Upgrading By Jigs In Presence Of Steel Balls As Ragging Material, Ahmed Sobhy, Ayman A. El-Midany, Suzan S. Ibrahim

Mining Engineering Faculty Research & Creative Works

Gravity separation using jigs is widely used for coarse particle sizes separation. However, fine sizes reduce jig performance. In this study, the upgrading of celestite ore by jig was investigated at different size fractions in the presence of ragging material. Three size fractions, i.e., -15+2 mm, - 2.0 + 0.50 mm and - 0.50 + 0.08 mm were used. The steel balls were used, as ragging material, to improve the separation of fines as well as to improve the concentrate quality. The statistical design was used to correlate celestite grade and recovery with studied operating variables, i.e., the ragging number …

Modeling Of Rare Earth Solvent Extraction Process For Flowsheet Design And Optimization, Vaibhav Kumar Srivastava

Theses and Dissertations--Mining Engineering

The separation and purification of rare earth elements (REEs) into individual products has been a topic of significant interest for researchers and engineers for many decades. The prime reason for such sustained interest is due to REEs’ demand and application in modern technology, as well as the challenges associated with their separation and purification. The chemical similarity of rare earth group elements is responsible for difficult separability which makes purification of individual elements challenging. Despite associated complications, processes such as solvent extraction (SX) and ion-exchange have been successfully utilized in the separation and production of REEs on pilot and commercial …

Assessment Of Rib Failure Mechanisms Using Discontinuum Mechanics Based Modeling Approach, Maurice Nuonituo Sunkpal

Doctoral Dissertations

"Coal mine rib failures are major safety and health challenge for coal mines worldwide. The need for clear procedures to evaluate mine rib behavior and to provide an efficient, reliable, and consistent rib control protocol is needed. Understanding coal rib geomechanics is essential for improving rib stability and eliminating fatality and injury trends due to rib failures. This knowledge is also vital to determine support requirements.

The rib control practices used in the 21st Century in most countries originated in roof control techniques. Understandably, applying roof control methods to coal rib does not yield desirable results. The geology of structures …

Computational Intelligent Impact Force Modeling And Monitoring In Hislo Conditions For Maximizing Surface Mining Efficiency, Safety, And Health, Danish Ali

Doctoral Dissertations

"Shovel-truck systems are the most widely employed excavation and material handling systems for surface mining operations. During this process, a high-impact shovel loading operation (HISLO) produces large forces that cause extreme whole body vibrations (WBV) that can severely affect the safety and health of haul truck operators. Previously developed solutions have failed to produce satisfactory results as the vibrations at the truck operator seat still exceed the “Extremely Uncomfortable Limits”. This study was a novel effort in developing deep learning-based solution to the HISLO problem.

This research study developed a rigorous mathematical model and a 3D virtual simulation model to …

Evaluation Of Excavated Surface Irregularities And Hardness Of Mechanical Excavations And Their Relationship With Excavator Performance, Prosper Evaristus Akansah Ayawah

Doctoral Dissertations

"This research involved lab and numerical excavation of a clastic sedimentary rock (Roubidoux Sandstone) using a long-bladed disc cutter in a Linear Rock Cutting Machine (LCM) with the aim of establishing relationships between the cutting parameters, excavated surface parameters (underbreaks, overbreaks and hardness), and performance parameters (specific energy and cutting rate). Three-dimensional cutting forces were recorded during the linear cutting. A structured laser imaging system was used to image the excavated surfaces for the estimation of the irregularities (ridge volumes (RV) and overbreak volumes (OV)). The excavated surface hardness was measured using the N-type Schmidt hammer. The numerical simulation was …

Investigation Of Coal Burst Potential Using Numerical Modeling And Rock Burst Indices, Cristian David Cardenas Triana

Theses and Dissertations--Mining Engineering

Coal bursts are typically defined as a rapid failure of coal or surrounding rock producing a violent release of energy and ejection of rock particles. This phenomenon is extremely complex and dynamic, and this has made it very difficult to predict. In the last decades, different researchers have aimed to understand the sources and mechanisms of failure of coal bursts. Various indices have been developed to assess the burst potential such as the Burst Potential Index (BPI), Energy Storage Rate, and the Strain Energy Density. Lately, numerical modeling has also been used as a tool to examine the rock deformation …

An Approach For Predicting Flow Characteristics At The Continuous Miner Face, Kayla Henderson

Theses and Dissertations--Mining Engineering

As coal and rock are mined, dust is dispersed into the air. This dust, among other contaminants, poses a serious health and safety risk to mineworkers. Very fine dust known as respirable dust can infiltrate the deepest part of the lungs, and long-term exposure to these particles leads to a disease called coal worker’s pneumoconiosis (CWP). Occurrence of this disease declined steadily over the latter half of the 20^th century; however, a recent study indicates that CWP has reemerged with an upward trend beginning at the turn of the century. To combat dust exposure, mine operators use a combination …

Application Of A Novel Ventilation Simplification Algorithm, Caitlin V. Strong

Theses and Dissertations--Mining Engineering

Ventilation network analysis is an integral part of maintaining a safe mine environment. Despite its important role, liberties are often taken with the representation of networks in ventilation network analysis software. In order to provide an alternative to heuristic methods used by ventilation engineers, a simplification algorithm has been developed. This algorithm is designed to work as a compliment to ventilation software. Comparisons of original ventilation networks and simplified networks show little to no change in fan operating point. The program utilizing this algorithm provides an alternative to reducing networks with a parallel factor. It can also be used in …

Capture Of Respirable Dust Using Maintenance Free Impingement Screen, Neeraj Kumar Gupta

Theses and Dissertations--Mining Engineering

Dust produced during mining activities has a detrimental effect on both miners’ health and operations’ safety. There is no definitive treatment for coal miners’ pneumoconiosis (CWP), which is caused by prolonged inhalation of respirable dust. Elevated coal dust concentrations have also been shown to cause several disastrous explosions in the United States and worldwide, resulting in the death of miners and loss of operations. Flooded-bed dust scrubbers are used on all modern-day continuous miners. These devices cleanse the dust-laden air and assist in bringing fresh air towards the mining face. Scrubbers use a multi-layered fibrous screen to capture airborne particles. …

Concepts For Development Of Shuttle Car Autonomous Docking With Continuous Miner Using 3-D Depth Camera, Sibley Miller

Theses and Dissertations--Mining Engineering

In recent years, a great deal of work has been conducted in automating mining equipment with the goals of increasing worker health and safety and increasing mine productivity. Automating vehicles such as load-haul-dumps been successful even in underground environments where the use of global positioning systems are unavailable. This thesis addresses automating the operation of a shuttle car, specifically focusing on positioning the shuttle car under the continuous miner coal-discharge conveyor during cutting and loading operations. This task requires recognition of the target and precise control of the tramming operation because a specific orientation and distance from the coal discharge …

Oxidation Pretreatment For Enhanced Leachability Of Rare Earth Elements From Bituminous Coal Sources, Tushar Gupta

Theses and Dissertations--Mining Engineering

Rare earth elements (REEs) are critical components in advanced electronics, clean energy technologies, and national energy and economic security. The global supply situation of these strategically valuable elements remains critical as the market is largely monopolistic. Thus, to alleviate the dependence on global imports, investments are being made in the research and development of innovative and cost-effective technologies for the indigenous processing and recovery of REEs from alternate sources that are cheap and abundant. Numerous research findings have identified potential benefits and proven the technological feasibility of extracting and selectively concentrating REEs from coal byproducts such as preparation plant rejects …

Nonlinear Wave Evolution In Interaction With Currents And Viscoleastic Muds, Elham Sharifineyestani, Navid Tahvildari

Civil & Environmental Engineering Faculty Publications

A numerical model is extended to investigate the nonlinear dynamics of surface wave propagation over mud in the presence of currents. A phase-resolving frequency-domain model for wave-current interaction is improved to account for wave modulations due to viscoelastic mud of arbitrary thickness. The model compares well with published laboratory data and performs slightly better than the model with viscous mud-induced wave damping mechanism. Monochromatic and random wave simulations are conducted to examine the combined effect of currents, mud-induced wave dissipation and modulation, and nonlinear wave-wave interactions on surface wave spectra. Results indicate that current effects on wave damping over viscoelastic …