scholarly journals Research on Prevention and mitigation of Deep Mine Hazards in Ningzheng Mining Area

2019 ◽  
Vol 118 ◽  
pp. 04003
Author(s):  
Lan Yu ◽  
Rili Yang ◽  
Chao Zheng ◽  
Shuang Li
Keyword(s):  
Mining Area ◽  
Gansu Province ◽  
Mine Pressure ◽  
Prevention Measures ◽  
Coal Seams ◽  
Deep Mine ◽  
Mining Areas ◽  
Cogeneration System ◽  
Cooling Technology ◽  
Realistic Significance

Ningzheng Mining Area, as one of the key mining areas of Longdong Energy Base in Gansu Province, whose average overburden depth of coal seams is more than 800 meters and average thickness of coal seams ranges from 8m to 14m. This paper analyzed the typical characteristics of water damage, heat damage, high mine pressure and gas disaster in Ningzheng mining area. Disaster prevention measures and two resource utilization prevention technologies (namely EMS cooling technology, Gas power generation and cogeneration system cooling technology) were put forward, the rearch has a realistic significance for the safety exploitation, comprehensive utilization of deep coal resources in China, energy conservation and emission reduction and development of circular economy.

Mechanism Analysis of Hydraulic Cutting Outburst Prevention Measure Applied to Mining Area of Heilongjiang Province

2014 ◽  
Vol 919-921 ◽  
pp. 860-864 ◽  
Author(s):  
Xi Ming Liu ◽  
Min Hui Liu ◽  
Yu Kang ◽  
Jing Zhou
Keyword(s):  
Coal Seam ◽  
New Technology ◽  
Mining Area ◽  
Intensity Change ◽  
Heilongjiang Province ◽  
Mechanism Analysis ◽  
Prevention Measures ◽  
Medium Thickness ◽  
Mining Areas ◽  
Prevention Measure

Grave protrusion coal seam tunnelling hydraulic cutting outburst prevention measure is a new technology in the world. The measure had been applied successfully to Jiaozuo Coal Group and run well. The mining areas of Heilongjiang are characterized by complex geological structures, more medium-thickness protrusion coal seam and abundant groundwater, on the basis of referring to technical parameters of the outburst prevention measures of Jiaozuo Coal Group, the outburst prevention mechanism of hydraulic cutting applied to medium-thickness protrusion coal seam was analyzed from the coal stress surrounding hole, internal forces of gas, stress concentrated zone and its moving speed, thickness of pressure released zone and intensity change of coal, and the feasibility of hydraulic cutting outburst prevention technique applied to Heilongjiang was verified. This provides theoretical basis for the technique applied to mining area of Heilongjiang Province.

scholarly journals The impact of the enrichment of the radionuclide thorium in the water body caused by industrial mining on the local ecological environment

2021 ◽  
Vol 236 ◽  
pp. 03006
Author(s):  
Fengjiao Hu ◽  
Li Deng ◽  
Zhichao Chen
Keyword(s):  
Surface Water ◽  
Water Body ◽  
Water Environment ◽  
Mining Area ◽  
Average Concentration ◽  
Gansu Province ◽  
Ecological Environment ◽  
Mining Areas ◽  
Industrial Mining ◽  
The Impact

In order to further understand the impact of industrial mining on the environment, this study conducted environmental monitoring on the radionuclide thorium content in a water body in an industrial mining area in Gansu Province, aiming to fully understand the occurrence of radioactive map elements in the area and its impact on the local. The specific impact caused by the ecological environment. The results of this paper are as follows: In the water environment surveyed this time, surface water has the highest content of radioactive thorium at 0.2μg/L, and the lowest concentration of radioactive thorium in groundwater, with an average concentration of 0.04 μg/L. And with the depth of surface water sampling, there is a negative correlation between the content of thorium in the water. This research content can provide sufficient reference materials for the occurrence of thorium in the water in industrial mining areas, and is of great significance to the related research on radioactive elements in the water.

scholarly journals Multifunctional Activities of Gold Nanoparticles Biosynthesized Using Bacteria Isolated from Mining Areas

2021 ◽  
Vol 11 (8) ◽  
pp. 3670
Author(s):  
Chih-Yu Chen ◽  
Yung-Chu Chang ◽  
Teh-Hua Tsai ◽  
Man-Hai Liu ◽  
Ying-Chien Chung
Keyword(s):  
Gold Nanoparticles ◽  
Mining Area ◽  
Synthesis Process ◽  
Average Particle ◽  
Bifidobacterium Lactis ◽  
E Coli ◽  
Mining Areas ◽  
Skin Cells ◽  
Study Results ◽  
Antityrosinase Activity

Research on gold nanoparticles (AuNPs) has often focused on their physical, chemical, and crystalline characteristics. Commercial AuNPs have been applied in the diverse fields of biomedicine, catalysis, photovoltaics, and sensing. In this study, we explored the various activities of AuNPs to widen their applicability. This paper presents a simple and rapid synthesis process of AuNPs with bacteria isolated from a gold mining area. We also investigated the optimization of reaction parameters for AuNP synthesis. The study results revealed that among the isolated strains, Bifidobacterium lactis and Escherichia coli demonstrated the highest capabilities of AuNP synthesis. The optimal pH values for AuNP synthesis by B. lactis (BLAuNPs) and E. coli (ECAuNPs) were 5.0 for 72 h of incubation and 8.0 for 24 h of incubation. The average particle sizes of ECAuNPs and BLAuNPs were 4.2 and 5.6 nm, respectively. Furthermore, these biogenic AuNPs were found to be stable with no aggregation after 3 months of storage. BLAuNPs and ECAuNPs exhibited high levels of antimicrobial, antioxidant, photocatalytic, and antityrosinase activity. Moreover, they were noncytotoxic to skin cells even at 100% melanin inhibitory concentrations. Considering the demonstrated multifunctional activities of AuNPs, BLAuNPs and ECAuNPs have promising potential for commercialization.

scholarly journals Geochemical Characteristics and Prospecting Prediction of Sediment in Songwang Area, Bobai County, Guangxi

2019 ◽  
Vol 4 (1) ◽  
Author(s):  
Wai Yi
Keyword(s):  
Water System ◽  
Mining Area ◽  
Geochemical Characteristics ◽  
Good Prospect ◽  
Mining Areas ◽  
Geological Characteristics ◽  
Geochemical Anomalies ◽  
Magmatic Rocks ◽  
Prospecting Prediction

The characteristics of strata, structures, magmatic rocks, lithology and mineralization in Dongtao mining area (Songwang area) of Bobai County, Guangxi were summarized. According to the geochemical anomalies of sediment in water system, and the main anomalies are explained and evaluated, combined with the geological characteristics of Dongtao and other mining areas, the prospecting prediction of favorable areas is carried out, and it is considered that there is a good prospect of prospecting.

INVESTIGATION OF MAINGATES STABILITY IN STEEP COAL SEAMS AT EXTRACTION LAYOUTS OF DEEP MINE

2020 ◽  
pp. 89-100
Author(s):  
Leonid Bachurin ◽  
◽  
Yuliia Novikova ◽  
Yuliia Simonova ◽  
Vytalyi Dovhal ◽  
...  
Keyword(s):  
Hanging Wall ◽  
Cross Sectional Area ◽  
Practical Significance ◽  
Sectional Area ◽  
Coal Seams ◽  
Cross Sectional ◽  
Deep Mine ◽  
Secondary Support ◽  
The Cross ◽  
Mining Face

Purpose of work. Investigation of maingates stability in different methods of protection on the extraction layouts of a deep coal mine, which develops steeply inclined coal seams. Methods. To achieve this goal, mine experimental observation of maingates stability performed. Conditions for their maintenance are evaluated by the magnitude of the convergence of the side rocks on the contour and changes in the cross-sectional area of the gateroads. Results. As a result of the research the conditions of maingates stability in steep coal seams in protection by pillars or timber sets are substantiated. It is recorded that in the zone of influence of extraction operations, at a distance of l <60 m behind the mining face with the considered methods of protection, the support of the maingates is deformed within the yielding limits and has characteristic flexures the side of hanging wall. At a distance of l≥60 m, the cross-sectional area of the maingates is reduced to 50% of the initial values, and the amount of roof to floor convergence exceeds the flexibility of the support. The increase displacement of rock mass on the contour of the supported roadway behind the mining face depends on the strength and geometry of the secondary support structures above the maingate. Novelty. It is experimentally established that the change in the cross-sectional area of the maingate during protection by timber sets occurs linearly with increasing length of the extraction layout. Practical significance. To ensure the maingates stability, it is advisable to use non-pillar methods of protection, when using yielding secondary support systemsabove the roadway, or backfilling.

Variabilities of Surface Water Quality of Degraded Post-mining Areas in Bytom

2021 ◽  
Vol 23 ◽  
pp. 318-331
Author(s):  
Aleksandra Czajkowska ◽  
Łukasz Gawor
Keyword(s):  
Water Quality ◽  
Surface Water ◽  
Ph Value ◽  
Surface Water Quality ◽  
Water Hardness ◽  
Total Content ◽  
Mining Area ◽  
Physicochemical Analysis ◽  
High Concentration ◽  
Mining Areas

In the paper there is presented an evaluation of variability of surface water quality (reservoirs and watercourses), on the area of degraded post-mining area in Bytom. The physicochemical analysis of water and compared with archival data obtained in 2009 and 2014. There were done analysis of following parameters: reaction, total content of substances dissolved in water, water hardness and the content of: Cl-, SO42-, HCO3-, Ca2+, Mg2+, K+, Na+, NH4+, NO3-, NO2-, PO4- ions as well as Fe and Mn. The examined surface waters were characterised by high content of solutes. Anions were dominated by chlorides, the sodium proved to be the dominating cation, the examined water samples were characterised by high concentration of sulphates. In all analyzed reservoirs, permissible concentrations of chlorides and sulphates were exceeded. In all sample points there was observed a decrease of pH value in long term period, the concentration of chlorides lowered, however concentrations of sulphates increased in the majority of sampling points.

scholarly journals Prediction of the First Weighting from the Working Face Roof in a Coal Mine Based on a GA-BP Neural Network

2019 ◽  
Vol 9 (19) ◽  
pp. 4159
Author(s):  
Tan ◽  
Yang ◽  
Chang ◽  
Zhao
Keyword(s):  
Neural Network ◽  
Coal Mine ◽  
Bp Neural Network ◽  
Prediction Models ◽  
Initial Pressure ◽  
Mining Area ◽  
Mine Pressure ◽  
Mine Production ◽  
Production Safety ◽  
Matlab Programming

The accidents caused by roof pressure seriously restrict the improvement of mines and threaten production safety. At present, most coal mine pressure forecasting methods still rely on expert experience and engineering analogies. Artificial neural network prediction technology has been widely used in coal mines. This new approach can predict the surface pressure on the roof, which is of great significance in coal mine production safety. In this paper, the mining pressure mechanism of coal seam roofs is summarized and studied, and 60 sets of initial pressure data from multiple working surfaces in the Datong mining area are collected for gray correlation analysis. Finally, 12 parameters are selected as the input parameters of the model. Suitable back propagation (BP) and GA(genetic algorithm)-BP initial roof pressure prediction models are established for the Datong mining area and trained with MATLAB programming. By comparing the training results, we found that the optimized GA-BP model has a larger determination coefficient, smaller error, and greater stability. The research shows that the prediction method based on the GA-BP neural network model is relatively reliable and has broad engineering application prospects as an auxiliary decision-making tool for coal mine production safety.

scholarly journals Dust Dispersion and Its Effect on Vegetation Spectra at Canopy and Pixel Scales in an Open-Pit Mining Area

2020 ◽  
Vol 12 (22) ◽  
pp. 3759
Author(s):  
Baodong Ma ◽  
Xuexin Li ◽  
Ziwei Jiang ◽  
Ruiliang Pu ◽  
Aiman Liang ◽  
...  
Keyword(s):  
Remote Sensing ◽  
Mining Area ◽  
Open Pit ◽  
Open Pit Mining ◽  
Vegetation Canopy ◽  
Dust Pollution ◽  
Mining Areas ◽  
Dust Effect ◽  
Dust Dispersion ◽  
Pixel Scale

Dust pollution is severe in some mining areas in China due to rapid industrial development. Dust deposited on the vegetation canopy may change its spectra. However, a relationship between canopy spectra and dust amount has not been quantitatively studied, and a pixel-scale condition for remote sensing application has not been considered yet. In this study, the dust dispersion characteristics in an iron mining area were investigated using the American Meteorological Society (AMS) and the U.S. Environmental Protection Agency (EPA) regulatory model (AERMOD). Further, based on the three-dimensional discrete anisotropic radiative transfer (DART) model, the spectral characteristics of vegetation canopy under the dusty condition were simulated, and the influence of dustfall on vegetation canopy spectra was studied. Finally, the dust effect on vegetation spectra at the canopy scale was extended to a pixel scale, and the response of dust effect on vegetation spectra at the pixel scale was determined under different fractional vegetation covers (FVCs). The experimental results show that the dust pollution along a haul road was more severe and extensive than that in a stope. Taking dust dispersion along the road as an example, the variation of vegetation canopy spectra increased with the height of dust deposited on the vegetation canopy. At the pixel scale, a lower vegetation FVC would weaken the influence of dust on the spectra. The results derived from simulation spectral data were tested using satellite remote sensing images. The tested result indicates that the influence of dust retention on the pixel spectra with different FVCs was consistent with that created with the simulated data. The finding could be beneficial for those making decisions on monitoring vegetation under dusty conditions and reducing dust pollution in mining areas using remote sensing technology.

Mine Dynamic Monitoring and Integrated Management Based on RS and GIS

2014 ◽  
Vol 955-959 ◽  
pp. 3840-3844 ◽  
Author(s):  
Xue Yuan Li ◽  
Shi Lei Chen ◽  
Kai Bian
Keyword(s):  
Integrated Management ◽  
Mineral Resources ◽  
Accurate Method ◽  
Mining Area ◽  
Dynamic Monitoring ◽  
Mining Areas ◽  
Rs And Gis ◽  
Wide Range ◽  
Spatial Database Engine ◽  
Mine Development

The development of mineral resources is accompanied by serious threats to the geological environment in China. In order to balance mining order, mine environmental protection and ecological restoration, this article examines a case study of Ningwu mining area and proposes an accurate method for mine dynamic monitoring in mining area based on remote sensing (RS), which is a series of technical processes with RS images selection, mine development situation and dynamic monitoring which includes areas change and types transfer. Findings indicate that the area of bauxite pit, bauxite and coal dump increased, the area of coal industrial square decreased, coal dump and industrial square mainly transferred into bauxite pit. The organization and storage model were discussed for results integrated management by spatial database engine (ArcSDE).The application of results retrieval was developed by GIS components. This method can be considered as an effective approach for a wide range of mine development monitoring in mining areas in China.

Assessment of rigid overlying strata failure in face mining

2010 ◽  
Vol 2 (4) ◽  
Author(s):  
Eva Jiránková
Keyword(s):  
Longwall Mining ◽  
Practical Importance ◽  
Assessment Method ◽  
Coal Seams ◽  
Deep Mine ◽  
Failure Assessment ◽  
Surface Measurements ◽  
Strata Failure ◽  
Simultaneous Assessment ◽  
Overlying Strata

AbstractThe method of overlying strata failure assessment of extracted seams is based upon the simultaneous assessment of surface subsidence and seismic activity, considering the spatiatemporal progress of mining, depending on the character of the rock mass. The rigid overlying strata failure assessment results in finding whether a failure of the firm overlying rocks occurred or whether a strutting arch was formed over the mined-out area. The practical importance of the overlying strata failure assessment consists in determining the size of the mined-out area at which the com-plete failure of the rigid overlying strata occurred and in the assessment of the current stress condition of the overlying strata failure. The assessment method is applicable in deep mine workings where thick coal seams are being mined by means of the method of longwall mining with controlled caving. The results of this method are used to amend contemporary known methods of rock-burst protection, namely (regarding the use of surface measurements for the evaluation) in overlying strata areas.

Sign in / Sign up

Export Citation Format

Share Document