LONG-TERM FLOOR STABILITY OF AN INDIANA COAL MINE

Coal mine spoil is widespread in US coal mining regions, and the potential long-term leaching of toxic metal(loid)s is a significant and underappreciated issue. This study aimed to determine the flux of contaminants from historic mine coal spoil at a field site located in Appalachian Ohio (USA) and link pore water composition and solid-phase composition to the weathering reaction stages within the soils. The overall mineralogical and microbial community composition indicates that despite very different soil formation pathways, soils developing on historic coal mine spoil and an undisturbed soil are currently dominated by similar mineral weathering reactions. Both soils contained pyrite coated with clays and secondary oxide minerals. However, mine spoil soil contained abundant residual coal, with abundant Fe- and Mn- (oxy)hydroxides. These secondary phases likely control and mitigate trace metal (Cu, Ni, and Zn) transport from the soils. While Mn was highly mobile in Mn-enriched soils, Fe and Al mobility may be more controlled by dissolved organic carbon dynamics than mineral abundance. There is also likely an underappreciated risk of Mn transport from coal mine spoil, and that mine spoil soils could become a major source of metals if local biogeochemical conditions change.

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A Fiber Bragg Grating Borehole Deformation Sensor for Stress Measurement in Coal Mine Rock

Sensors ◽

10.3390/s20113267 ◽

2020 ◽

Vol 20 (11) ◽

pp. 3267 ◽

Cited By ~ 1

Author(s):

Wusheng Zhao ◽

Kun Zhong ◽

Weizhong Chen

Keyword(s):

Optical Fiber ◽

Coal Mine ◽

Stress Measurement ◽

Mechanical Load ◽

Field Tests ◽

Test Accuracy ◽

Stress Monitoring ◽

Stress Changes ◽

Term Performance

A borehole deformation sensor for long-term stress monitoring in coal mine rock based on optical fiber Bragg gratings (FBGs) is presented. The sensor converts borehole deformation into optical fiber strain by using four rings. For each ring, two FBGs are bonded with the ring to measure the borehole deformation, and a reference FBG free from mechanical load is introduced to remove the temperature effect. Two simple checks on the test data can be performed to improve the test accuracy. Laboratory and field tests were conducted to validate the accuracy and long-term performance of the sensor. The results show that the sensor is capable of measuring stress in rock with good accuracy, and it performs well over a long period of time in coal mines. The developed sensor provides an approach for the long-term monitoring of stress changes in coal mine rock.

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Deformation Monitoring and Stability Analysis of Shaft Lining in Weakly Cemented Stratum

Advances in Civil Engineering ◽

10.1155/2018/8462746 ◽

2018 ◽

Vol 2018 ◽

pp. 1-12 ◽

Cited By ~ 1

Author(s):

Xianzhou Lyu ◽

Weiming Wang

Keyword(s):

Real Time ◽

Monitoring System ◽

Coal Mine ◽

Deformation Monitoring ◽

Dynamic Monitoring ◽

Thick Wall ◽

Additional Stress ◽

The Real ◽

Shaft Lining

Shaft linings in thick weakly cemented stratum have the disadvantages of large deformation and repeated damage after repair. Considering the typical geologic characteristics and the failure characteristics of shaft linings, we establish a multilayer automatic deformation monitoring system in this paper, and the monitoring system can realize the real-time, continuous, and long-term dynamic monitoring on shaft linings. Based on the concrete strength failure criterion under biaxial compression and the analytical solution for spatially axisymmetric problem of thick-wall cylinders, the damage limit of the shaft lining in Xieqiao coal mine is obtained. Then, we choose three sections as the test area according to the typical damage forms of shaft linings to carry out the monitoring scheme on the auxiliary shaft in Xieqiao coal mine. The monitoring results show that the extreme value of the shaft lining deformation is 2.369 mm. And the shaft lining located in the border between the floor aquifer and the bedrock generates the most severe deformation, which is about 89.4% of the deformation limit. The shaft lining deformation increment fluctuates in certain range, which belongs to elastic deformation. Finally, we inverse the stress state according to the deformation value of the shaft lining, and the obtained additional stress is found to be lower than the ultimate compressive strength. Long-term project practice confirms that the deformation monitoring results can reflect the real stress condition of the shaft lining and that the monitoring system can realize the real-time dynamic evaluation for the status of the shaft lining.

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The Results of the Study of the Impact of Stacking Technologies of Coal Mine Cuts on the Environmental State of Forest Reclamation

Ecology and Industry of Russia ◽

10.18412/1816-0395-2019-2-42-47 ◽

2019 ◽

Vol 23 (2) ◽

pp. 42-47 ◽

Cited By ~ 1

Author(s):

I.V. Zen’kov ◽

V.V. Zhukova ◽

V.N. Vokin ◽

E.V. Kiryushina ◽

Yu.A. Anischenko ◽

...

Keyword(s):

Environmental Monitoring ◽

Coal Mine ◽

Waste Dump ◽

Scotch Pine ◽

Technological Factors ◽

Siberian Spruce ◽

Forest Reclamation ◽

The Impact

The results of long-term environmental monitoring of the condition of Scotch pine and Siberian spruce, planted on stackings of the Borodinsky coal mine, are presented. The height of pines and spruces at the age of 11-14 years has been established, and the influence of the main technological factors on this indicator has been investigated. The dependences of the height of trees on the composition of rocks laid in the upper layer of the waste dump are presented.

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Implication of Mining to Health in Maiganga Coal Mine, Gombe State, Nigeria

Indian Journal of Management and Language ◽

10.54105/ijml.b2003.101221 ◽

2021 ◽

pp. 4-14

Author(s):

Engr. Amosu C.O. ◽

◽

Enitan C.S.A. ◽

Eniola C.S.A. ◽

◽

...

Keyword(s):

Environmental Impacts ◽

Coal Mine ◽

Mining Industry ◽

Well Being ◽

Toxic Substances ◽

Mining Communities ◽

Mining Sites ◽

Living Things ◽

High Concentrations

Operations of mining are large industrial scale in nature, with significant environmental impacts. The mining industry generates and produces wastes containing high concentrations of metals and metalloids which are highly toxic and destructive to the immediate landscape and environment. In addition, the continued use of the traditional methods of mining intensifies the emission of toxic and products that are not friendly to the ecosystem.. Even regulated and controlled mining sites release toxins into the surrounding environment. While mining has prospects and benefits to the economy, both in terms of its own economic impact and the value to other industries of its product, it almost always has adverse environmental impacts and eventually health impacts. There are numerous ways in which mines impact the health of nearby environments and local communities. Mining involves some generally standard processes and practices. This paper considers the effects and harm done to living things around the mine location. By understanding mining’s threats to health and long-term well-being and by taking precautions to reduce harm in all mines, miners and other people in mining communities can better protect their health and improve their lives. This research will address questions like: which are the toxic substances causing health problems in Maiganga Coal Mine? What is the challenging impact of toxic substances in Maiganga coal Mine?.

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