Engineering Commons^™

Application Of Synthetic Aperture Radar Interferometry To Monitor Surface Deformations Of The Trans-European Transport Network (Ten-T) – A Case Study Of The Motorways Crossing Areas Of Mining Operations In The Upper Silesian Coal Basin, Poland, Adam Smoliński, Mariusz Stawinoga, Tomasz Pindel

Journal of Sustainable Mining

Underground hard coal mining causes surface deformations. When the mining operations are conducted beneath linear objects, such as motorways, there is a risk of deformations of the axis of the road and its horizontal and vertical alignment (additional bends and vertical curvatures, longitudinal inclinations, deformations of crosssections). In the areas subjected to mining operations, mining plants conduct geodetic monitoring. Due to their labour intensity and costs, geodetic measurements are usually made only a few times a year. The article discusses the possibility of applying Interferometric Synthetic Aperture Radar (InSAR) to monitor the subsidence of the vertical alignment of motorways caused …

Rainfall-Runoff Mechanisms And Flood Mitigation In A Coastal Watershed With Numerous Wetlands And Ponds, Homa Jalaeian Taghadomi

Civil & Environmental Engineering Theses & Dissertations

This study analyzed mechanisms of flooding in Blackwater River Watershed, located in coastal Virginia and hydraulically connected with mid-Atlantic Ocean. The analysis was based on the examination and simulation of the rainfall-runoff relationship, and such an analysis is very important for conventional water resource management and dealing with hydrologic extremes (e.g., floods and droughts, as well as ecological and pollution discharges). The rainfall-runoff relationship is a quantitative description of the hydrologic cycle, a dynamic process that can be interactively influenced by various factors, namely climate, topography, soils, land use and land cover, and land management practice.

In the past 60 …

Comparing Instruments For Measuring Runoff From Experimental Ecoroof Platforms: A Case Study On Test Plots At Portland State University, Chance F. Hodges

University Honors Theses

Stormwater management is a primary ecological benefit ecoroofs provide to ecosystems. Quantification of runoff from large scale ecoroofs is difficult to replicate, so researchers often utilize smaller experimental ecoroof platforms. This approach is becoming increasingly common, so it is useful to compare and contrast approaches for runoff measurement at the platform scale. This paper uses the four 17.86 m² ecoroof platforms located on the Science Research and Teaching Center (SRTC) at Portland State University (PSU) in Portland, OR as a case study. A unique condition of these platforms is that they are installed at grade on the roof with …

Flood Hazard Mapping And Assessment Of Precipitation Monitoring System Using Gis-Based Morphometric Analysis And Trmm Data: A Case Study Of The Wadi Qena Watershed, Egypt, Wael M. Elsadek, Wael E. Mahmod, Mona G. Ibrahim

Applied Environmental Research

Wadi Qena is one of the Nile Valley areas particularly at risk of severe flash flooding, located in Egypt. The study aims to verify TRMM rainfall data (TRMM 3B42), using eight stations across Egypt as well as relies on morphometric analysis to generate a flood risk map based on the ranking method. Three process could be recognized through the study, calibration, correction and verification processes. The results discuss the match daily rainfall trends of TRMM and observed data, producing a correction equation for TRMM data with root mean square error (RMSE) value of 0.837 mm d-1 and R2= 0.238 (calibration …

Biochar From Rice Husk As Efficient Biosorbent For Procion Red Removal From Aqueous Systems, Neza R. Palapa, Tarmizi Taher, Novie Juleanti, Normah Normah, Aldes Lesbani

Applied Environmental Research

Numerous reports have elucidated the use of biochar (BC) to adsorb dyes from wastewater. However, its applicability for adsorbing Procion Red, which causes carcinogenic and mutagenic effects on aquatic life, has not been studied. In this work, biochar produced from rice husk in Sumatera, Indonesia was used as a biosorbent for Procion Red removal from aqueous systems. Rice husk-BC was characterised using X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, surface area specific analysis, and scanning electron microscopy (SEM) for mor-phological analysis. The characterisation showed a (002) reflection peak at 2θ = 23° with broad and quite intense diffraction, which …

Monitoring The Land Cover Changes In Mangrove Areas And Urbanization Using Normalized Difference Vegetation Index And Normalized Difference Built-Up Index In Krabi Estuary Wetland, Krabi Province, Thailand, Katawut Waiyasusri

Applied Environmental Research

Krabi Estuary Wetland (KEW) is an outstanding wetland with an estuary environment. At present, the tourism industry has rapidly grown, resulting in the impact of land cover changes. This research aims to assess the changes that have occurred in the KEW from 1999 to 2020 using NDVI and NDBI for monitoring changes in mangrove areas and urbanization in Krabi Province, Thailand. Landsat satellite images in years 1999, 2009 and 2020 were classified by using a band ratio to create land cover maps. The results show that NDVI between 0.41–1.00 clearly shows the mangrove forest area, while NDBI between 0.01–0.40 shows …

Application Of Gis And Multi-Criteria Statistical Techniques In Assessing Water Quality In The Coastal Province Of Vietnamese Mekong Delta, Giao Thanh Nguyen, Thi Hong Nhien Huynh

Applied Environmental Research

The study was conducted to evaluate the quality and spatial distribution of surface water quality in Soc Trang, a coastal province using Geographic information system (GIS) and multivariate statistical analysis. Water monitoring data was collected from 19 sampling locations with 19 parameters were analyzed from February 2019 to August 2020. The results indicated that water quality was contaminated with organic matters, nutrients, coliforms and salinity. Water quality index (WQI=22–73) indicated that water quality was from poor to medium level. Cluster analysis (CA) classified 19 monitoring sites into 7 groups and 19 months into 3 seasons including rainy season, rainy season-early …

Adsorption Of Methylene Blue By Low-Cost Biochar Derived From Elephant Dung, Yanasinee Suma, Nittaya Pasukphun, Numfon Eaktasang

Applied Environmental Research

Elephant dung biochar (ED350) prepared by controlled heating at 350 ºC was used to adsorb methylene blue (MB) in an aqueous solution. The effects of adsorption time, pH, adsorbent dosage, and initial MB concentration were examined. Kinetic, isotherm, and thermo-dynamic models were then further analyzed to determine the adsorption. The results show that ED350 was found to be efficient within 180 min. The optimum pH of MB adsorption was 11. The Langmuir isotherm model was found to be the most suitable fit for the adsorption equilibrium data, with ED350 having a homogeneous surface. The calculated equilibrium parameter (RL) …

A Workforce And Truck Allocation Model In A Solid Waste Management System: A Case From Nigeria, Desmond E. Ighravwe, Sunday A. Oke

Applied Environmental Research

No abstract provided.

Spatiotemporal Flood Risk Determination And Management For A Large River Basin, Nuanchan Singkran

Applied Environmental Research

No abstract provided.

Synergistic Effect Of Waste Feedstock Mixture And Torrefaction Pre-Treatment On Some Briquette Characteristics Of Cornhusk And Sawdust Wastes, Mufutau A. Waheed, Opeyemi A. Akogun

Applied Environmental Research

Agricultural waste management through energy recovery is one of the critical options that could drive the clean energy production industry and properly replace the use of coal in Nigeria if done sustainably. The objective of this work therefore is to study the synergetic effect of waste feedstock mixture and torrefaction pre-treatment on some physical and performance characteristics of briquettes from cornhusk (CH) and sawdust (SD) wastes. In this work, CH and SD wastes were processed raw and torrefied at 200 to 300 °C and were mixed in the ratios between 90/10 and 10/90 for briquette production using D-optimal crossed design. …

Table Of Contents, The Editors

Coal Geology & Exploration

No abstract provided.

Research On Green Coal Mining Strategy In Hedong Coalfield Based On Resource And Geological Environment Characteristic, Liu Hanbin, Cheng Fangqin

Coal Geology & Exploration

Hedong Coalfield is located in the Loess Plateau of western Shanxi province at the western foot of the Lvliang Mountains in the middle reaches of the Yellow River. It is an important coking coal producing area, with severe soil erosion, fragile ecological environment, frequent occurrence of geological disasters and karst spring distribution in China. Through the analysis of resource and geological environment characteristics of Hedong Coalfield, it is found that the scarce coking coal reserves in Liliu mining area in the middle of the coalfield account for 70.8% of the total reserves. But its development intensity is higher than the …

Distribution And Enrichment Of Pollutants From Underground Gasification Of Bituminous Coal In Huating Mining Area, Zhu Lihui, Feng Beizhan, Hu Yongxing, Wang Mingzhong

Coal Geology & Exploration

In order to study the enrichment and distribution of pollutants from the underground gasification of bituminous coal in Huating Mining Area, and to evaluate the environmental factors of the underground gasification of bituminous coal, with an underground gasification simulation experimental platform system, this paper studies the enrichment of heavy metal pollutants in tar and gasification residues during gasification process by means of different oxygen-rich-water gasification experiments and pyrolysis experiments of coal samples in different sizes. The results show that the pyrolytic tar of bituminous coal tends to increase as its size increases, and the yield increases first and then decreases. …

Occurrence Characteristics And Resource Potential Evaluation Of Tar-Rich Coal For No.5-2Coal Seam In Shenfu Mining Area, Li Huabing, Yao Zheng, Li Ning, Gao Jun, Xie Qing, Wang Qiang

Coal Geology & Exploration

With the promotion of clean and efficient utilization of coal and the demand for high-quality development in the middle section of the Yellow River, the transformation and upgrading of coal industry is imperative in Yulin, and the exploitation of tar-rich coal one of the important directions. By organizing and making use of mass drill data, and in combination with the minefield underground spot sampling and regional geology, tar-yield characteristics and tar-rich coal occurrence features of tar-rich coal in No.5^-2 coal seam in Shenfu Mining Area are analyzed in detail. Based on analytic hierarchy process, this paper takes resource allocation, …

Organic Geochemistry Of The Jurassic Tar-Rich Coal In Northern Shaanxi Province, Zhang Ning, Xu Yun, Qiao Junwei, Ning Shuzheng

Coal Geology & Exploration

The organic geochemical characteristics of tar-rich coal are of great significance to study the paleosedimentary environment and evolution of coal seams. Taking coal samples from 6 main coal seams of Yan’an Formation in Northern Shaanxi Province as the research object, this paper analyses the organic geochemical characteristics of coal seams by coal quality analysis and gas chromatography-mass spectrometry. The results showed that coal samples had a high abundance of chloroform asphalt "A" and a low saturated hydrocarbon/aromatic hydrocarbon ratios, characterized by the unimodal pattern of n-alkanes and dominated by medium chainsaturated hydrocarbons. The ratios of Pr/C₁₇, Ph/C_{18 …}

Occurrence Characteristics Of Carboniferous-Permian Tar-Rich Coal And Its Influencing Factors In Northern Shaanxi, Yao Zheng, Luo Qianzhou, Li Ning, Li Huabing, Wang Qiang, Gao Jun

Coal Geology & Exploration

The rational development of tar-rich coal is of great significance to promote clean and efficient utilization of coal, improve the independent guarantee ability of oil and gas, and achieve carbon emission peak and carbon neutrality. In order to find out the occurrence characteristics of tar-rich coal in the typical mining areas of Carboniferous-Permian coalfield in Northern Shaanxi, based on coal exploration data and sample test results, this paper compares the tar yield of mineable coal seams, summarizes the spatial-temporal distribution rules of tar-rich coal, and discusses the occurrence influential factors. The results show that the average tar yield of mineable …

Gas Drainage Borehole Completion Technology Of Directional Long Hole Drilling With Negative Angle, Ma Zan, Chen Dongdong, Xie Hengxing, Chen Tianzhu, Wang Bin, Jia Bingyi

Coal Geology & Exploration

Pre-drainage of coal seam gas with directional long boreholes is an effective technical means to achieve advanced control of coal mine gas area. Affected by mining deployment, negative-angle boreholes(downward holes) are widely used in production. Medium-hard coal seams have good porosity and usually do not require hole protection. However, the existing conventional methods can not effectively solve the problem of water accumulation in negative angle long boreholes. This paper takes the downward long boreholes in the No. 9 medium-hard coal seam of Longfeng Coal Mine in Guizhou as the research object. Two sets of directional long boreholes are constructed in …

The Concealed Small Faults Detection Based On Gas Drainage Boreholes Along And Cross The Coal Seam, Xue Honglai, Wen Zhe

Coal Geology & Exploration

The faults have great influence on coal and gas outburst disasters, and accurate detection of faults location is very important to prevent such disasters. At present, large number of gas drainage boreholes were drilled in coal mines, but the geological information contained in these boreholes is not fully paid attention to, thus the method to detect concealed faults by gas-drainage boreholes was proposed. In this paper, by establishing a mathematical model for fault detection based on gas drainage drilling, a three-dimensional coordinate of fault planes and coal seam floors is calculated, and basic parameters such as fault location, drop, attitude …

Quantitative Study Of 3d Numerical Simulation On Optimizing Borehole Layout Spacing Of Gas Drainage, Chen Yuexia, Chu Tingxiang, Chen Peng, Tang Yang

Coal Geology & Exploration

In order to optimize the spacing of boreholes and realize efficient drainage, based on the fluid solid coupling model, a three-dimensional geometric model was established to make it closer to the field reality, the gas drainage processes of a coal mine with different borehole spacing were simulated using COMSOL software. The results show that: the effective drainage area was visualized by the three-dimensional diagram of the isobaric surface with gas pressure of 0.74 MPa, and the influence of borehole spacing on the extraction efficiency was discussed. The results show that: the effective extraction radius is about 1.5 m during gas …

An Advanced Co2 Gas-Phase Fracturing Technology For Efficient Methane Drainage, Outburst Prevention And Excavation In Outburst Coal Seam, Yang Baige, Zhang Junsheng, Linghu Jianshe, Cao Yunxing

Coal Geology & Exploration

Coal and gas outburst in coal mines is a serious disaster in China. Although the disaster has been reduced significantly over the past 10 years, vicious accidents still occure, causing serious losses to the lives of miners and the safety of coal mines. The current applied technologies for outburst prevention and control include hydraulic fracturing, hydraulic slitting, hydraulic flushing, deep hole blasting, intensive drilling, etc., which have solved the outburst problem and safe excavation in some degrees. Nevertheless, the above-mentioned technologies could not solve the problems of safety excavation in the high gas content and low permeability outburst coal seams. …

Effect Of Load On Adsorption Characteristics Of Remolded Coal, Dai Juhua, Wang Zhaofeng, Li Xuechen, Li Yanfei, Yue Jiwei

Coal Geology & Exploration

In view of the difficulty in preparing the coal with broken soft structure intact, it needs to be processed into remolded coal. In order to study the influence of suppression loads on the physical characteristics of coal, the micro-pore structure and adsorption characteristics of remolded coal under different molding loads were discussed based on the pore test experiment of low temperature liquid nitrogen and the methane adsorption experiment of high pressure capacity method. The results show that: The pore volume of micropores and pores decreases slightly with the increase of molding load, the specific surface area increases slightly with the …

Hydrate Reservoir Physical Properties Response And High-Pressure Gas-Water Reverse Penetration During Deepwater Oil And Gas Cementing, Zheng Mingming, Wang Xiaoyu, Zhou Kerui, Wang Kai, Wang Zhilin, Dong Gang, Wei Meng, Liu Tianle, Jia Dongyan

Coal Geology & Exploration

Well cementing is an important stage during the process of energy extraction. When deep-water oil and gas cementing encounters hydrate formations, the hydration heat of cementing slurry will cause hydrate decomposition in the reservoir near the borehole wall and reverse penetration of high-pressure gas-water. To reduce and avoid the adverse effects of hydrate decomposition, it is critical to clarify the physical response of hydrate reservoirs and the law of high-pressure gas-water reverse penetration under different cementing conditions. In this paper, a two-dimensional cementing numerical model is established according to the SH2 exploration well of GMGS-1 project in Shenhu area in …

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. …

Green Detection Method Of Coal Burning Area In Northern Shaanxi Based On Microbial Hydrocarbon Detection Technology, Duan Zhonghui, Ma Li, Hao Chun, Wang Lengyao, Mei Hai

Coal Geology & Exploration

Coal seams contain all kinds of light hydrocarbons. When coal seams are burned, the integrity of overlying strata is destroyed, which provides a good channel for hydrocarbon escape from the coal seam. This process conforms to the principle of light hydrocarbon microseepage. Then, microseepage associated microbial hydrocarbon detection technology is introduced to test its recognition ability of coal seam burning area. In Haojialiang Coal Mine of Jurassic Coalfield in northern Shaanxi, two survey lines were tested and butane bacteria was selected as microbial detection index. After microbial analysis process such as soil sampling, microbial culture, and colony count, combined with …

Feasibility Study On The Principle Of Punching-Shearing Composite Rock Fragmentation Mode Of Connecting Holes In Rock Strata, Wang Chuanliu

Coal Geology & Exploration

Replacing roadway with borehole is an important research direction of underground coal mine drilling technology, which has the advantages of high efficiency and low cost. However, in the construction of large diameter connecting holes in rock strata, the multi-stage reaming method has such problems as long lifting and drilling time and low efficiency of hole formation. This paper proposes the principle of punching-shearing composite rock fragmentation through structural and technological innovation without changing the configuration of drilling equipment. It is a creative combination of punching rock fragmentation of high-pressure water-impactor-inner bit rock and shearing rock fragmentation of drilling rig-drilling pipe-outer …

Analysis On The Deployment Of Mining Research Supported By The Grant Program Of Deep Resources Exploration And Mining, Fan Jun, Zhang Jialin, Qin Yuan, Wang Hao, Gao Yanan, Pei Yongzhi

Coal Geology & Exploration

The Deep Resources Exploration and Mining(DREAM) grant program, within the framework of The National Key Research and Development Program grants, is a pillar to implement China’s science and technology strategy in the area of deep resources exploitation. To tackle the insufficient of theories and technologies for the 1000-meter-deep mining, a section of mining, covering the research of basic theories, general technologies and application demonstration, was arranged in the layout of DREAM under the principle of "whole chain design, integrated implementation". In the aspect of basic research, DREAM mainly focused on the deep rock mechanics and mining theory, such as the …

Experimental Study On Multi-Scale Pore Structure Characteristics Of Tar-Rich Coal In Yushenfu Mining Area, Shen Yanjun, Wang Xu, Zhao Chunhu, Wang Shengquan, Guo Chen, Shi Qingmin, Ma Wen

Coal Geology & Exploration

Extracting oil and refining gas from oil-rich coal is an important measure to make up for the shortage of oil and gas supply in China. The research on pore development characteristics and permeability of tar-rich coal will help to better develop and utilize tar-rich coal. Taking the tar-rich coal in Yushenfu mining area as the research object, this paper studies the multi-scale pore structure and the whole segment pore characterization of tar-rich coal by such methods as low-temperature liquid nitrogen adsorption, mercury intrusion porosimetry, nuclear magnetic resonance and gas permeability measurement method. Based on the test results of multi-scale pore …

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 …

Analysis Of Interlayer Interference In Combined Development Of Coalbed Methane Wells And Discussion On Combined Production Methods：A Case Study Of Shoushan No.1 Coal Mine In Pingdingshan, Xu Yaobo

Coal Geology & Exploration

The combined development of multiple coal seams is a key technology to increase the production of single CBM wells. However, in engineering practice, most coal seams have interlayer interference problems, resulting in an insignificant increase in combined development gas production. In order to improve the gas production and development efficiency of combined development in coalbed methane wells, taking the combined production of coalbed methane in the No.4-2 coal seam and the No.2-1 coal seam of the Shoushan No.1 Coal Mine in Pingdingshan as an example, this paper analyses the influence factors and interference rules of interlayer interference, and proposes the …