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Advances in Coal and Water Co-mining
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Advances in Coal and Water Co-mining

A special issue of Energies (ISSN 1996-1073). This special issue belongs to the section "H: Geo-Energy".

Deadline for manuscript submissions: closed (1 September 2023) | Viewed by 7462

Special Issue Editor

Prof. Dr. Qiangling Yao

E-Mail Website
Guest Editor
School of Mines, China University of Mining and Technology, Xuzhou, China
Interests: green mining; coal mining

Special Issue Information

Dear Colleagues,

In 2021, fossil energy produced by coal will still account for the majority of the world's energy supply. However, underground coal mining causes damage to the overburden structure of the mine’s roof, resulting in a shift in the water circulation pattern of the aquifer from inter-bed runoff to vertical runoff, with most of the groundwater seeping into the overburden mining fissures and void areas, and leading to environmental problems such as the drying up of surface rivers and desertification of vegetation.

The special nature of the geological environment used for coal production dictates that priority must be given to the protection and scientific use of limited water resources in the coal development process in order to maintain and improve the fragile mining ecology. To achieve coal and water co-mining, the main challenges and technical bottlenecks currently faced include: geological condition survey and identification, rock movement control technology, slope stability control technology, the water–coal/rock interaction mechanism, surface and underground water reservoir technology, water and ecological constraints, ecological reconfiguration and restoration, etc. There are technical, economic, and infrastructural barriers related to these challenges that can be overcome with the help of researchers.

This Special Issue aims to present research and review articles on coal and water co-mining. The focus will be on the orderly, rational and efficient planning and use of water resources to meet the needs of different mining stages from the perspective of the whole mining cycle, to achieve coal–water co-mining and thus effectively improve the ecological environment of coal mining areas.

The topics of interest include, but are not limited to, the following:

  • Geological condition survey identification;
  • Evaluation of hydrogeological conditions;
  • Slope stability control technology;
  • Relationship between vegetation and groundwater level;
  • Structural protection of water-bearing (septic) seams during coal mining;
  • Surface and groundwater reservoir technology;
  • Coal and water co-mining technology;
  • Mechanisms of water–coal (rock) interactions;
  • Integrated use of mining water resources;
  • Water damage control in coal mines;
  • Detection and prediction of the height of the hydraulic fracture zone;
  • Influence mechanism of ecological environment in mining area;
  • Mine land reclamation and ecological reconstruction technology.

Prof. Dr. Qiangling Yao
Guest Editor

Manuscript Submission Information

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Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Energies is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • water-coal/rock interaction mechanism
  • coal and water co-mining
  • mining water resources

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Published Papers (5 papers)

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Editorial

Jump to: Research

3 pages, 176 KiB  
Editorial
Advances in Coal and Water Co-Mining
by Qiangling Yao and Liqiang Yu
Energies 2023, 16(6), 2666; https://doi.org/10.3390/en16062666 - 13 Mar 2023
Cited by 1 | Viewed by 1140
Abstract
According to data from the BP Statistical Review of World Energy 2020 [...] Full article
(This article belongs to the Special Issue Advances in Coal and Water Co-mining)

Research

Jump to: Editorial

17 pages, 7823 KiB  
Article
Numerical Investigation on the Yield Pillar Bearing Capacity under the Two-End-Type Cable Reinforcement
by Changhao Shan, Shenggen Cao, Zeyu Zhang, Kewen Lin and Jialong Sun
Energies 2023, 16(18), 6418; https://doi.org/10.3390/en16186418 - 5 Sep 2023
Cited by 2 | Viewed by 778
Abstract
For underground coal mining techniques such as gob-side entry retaining (GER) or gob-side entry driving (GED), the stability of yield pillars is paramount. A well-designed yield pillar aims to withstand mining-induced stresses. This study delves into the impact of bi-terminal cable support on [...] Read more.
For underground coal mining techniques such as gob-side entry retaining (GER) or gob-side entry driving (GED), the stability of yield pillars is paramount. A well-designed yield pillar aims to withstand mining-induced stresses. This study delves into the impact of bi-terminal cable support on the stability of such pillars. Utilizing 30 distinct numerical models, each with varying pillar width/height (w/h) ratios and diverse cable support methodologies, our findings suggest an upward trend in both peak and residual strength in response to heightened support strength. Notably, pillars with a wider configuration exhibited a more pronounced increase in peak strength compared to their narrower counterparts, while the latter showcased a more pronounced residual strength enhancement. Additionally, the residual/peak strength ratio was smaller in narrower pillars and increased with the increase in the cable support strength. In view of the surrounding rock mass’s support stress distribution, numerical modelling was adopted to analyze the underlying support mechanism. The results showed the support stress zones extended farther on both sides of pillars with the decrease in the row spacing, which made the radial stresses rise effectively and ameliorated the coal pillar’s stress state. Finally, with the 8311 operation advancing towards the station, the deformation amplitude of the coal pillar was only 2.28%, and the stability of the coal pillar was effectively maintained. Full article
(This article belongs to the Special Issue Advances in Coal and Water Co-mining)
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20 pages, 15603 KiB  
Article
Strength Damage and Acoustic Emission Characteristics of Water-Bearing Coal Pillar Dam Samples from Shangwan Mine, China
by Yang Wu, Qiangling Yao, Baoyang Wu, Hongxin Xie, Liqiang Yu, Yinghu Li and Lujun Wang
Energies 2023, 16(4), 1692; https://doi.org/10.3390/en16041692 - 8 Feb 2023
Cited by 3 | Viewed by 1502
Abstract
Long-term erosion and repeated scouring of water significantly affect the technical properties of coals, which are the essential elements that must be considered in evaluating an underground reservoir coal column dam’s standing sustainability. In the paper, the coal pillar dam body of the [...] Read more.
Long-term erosion and repeated scouring of water significantly affect the technical properties of coals, which are the essential elements that must be considered in evaluating an underground reservoir coal column dam’s standing sustainability. In the paper, the coal pillar dam body of the 22 layers of coal in the Shangwan Coal Mine is studied (22 represents No. 2 coal seam), and the water content of this coal pillar dam body is simplified into two types of different water content and dry–wet cycle. Through acoustic emission detection technology and energy dissipation analysis method, the internal failure mechanism of coal water action is analyzed. This study revealed three findings. (1) The crest pressure, strain, and resilient modulus in the coal sample were inversely related to the water content along with the dry–wet cycle number, while the drying–wetting cycle process had a certain time effect on the failure to the sample. (2) As the moisture content and the dry–wet cycle times incremented, three features were shown: first, the breakage pattern is the mainly stretching fracture for the coal specimen; second, the number and absolute value of acoustic emission count peaks decrease; third, the RA-AF probability density plot (RA is the ratio of AE Risetime and Amplitude, and AF is the ratio of AE Count and Duration) corresponds more closely to the large-scale destruction characteristics for the coal samples. (3) A higher quantity of wet and dry cycles results in a smoother energy dissipation curve in the compacted and flexible phases of the crack, indicating that this energy is released earlier. The research results can be applied to the long-term sustainability assessment of the dams of coal columns for underground reservoirs and can also serve as valuable content to the excogitation of water-bearing coal column dams under similar engineering conditions. Full article
(This article belongs to the Special Issue Advances in Coal and Water Co-mining)
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16 pages, 19187 KiB  
Article
Effect of Fly Ash and Steel Fiber Content on Workability and Mechanical Properties of Roadway Side Backfilling Materials in Deep Mine
by Shujuan Zhang, Chiyuan Che, Changzheng Zhao, Shuyu Du, Yang Liu, Jiang Li and Shengqiang Yang
Energies 2023, 16(3), 1505; https://doi.org/10.3390/en16031505 - 3 Feb 2023
Cited by 8 | Viewed by 1779
Abstract
The stable bearing capacity of roadside backfill body (RBB) is the key to control the surrounding rock deformation of gob-side entry retaining (GER) in deep mining. In this paper, slump and uniaxial compressive strength tests were conducted to study the changes of the [...] Read more.
The stable bearing capacity of roadside backfill body (RBB) is the key to control the surrounding rock deformation of gob-side entry retaining (GER) in deep mining. In this paper, slump and uniaxial compressive strength tests were conducted to study the changes of the slump and RBB mechanical properties of RBB fresh mixture under the influence of different percentages of fly ash (FA), river sand, and amounts of steel fiber (SF) admixture. The results show that (1) the slump first increases and then decreases with the increase of the FA proportion, while 20% of FA proportion is the critical point. In addition, SF has little influence on slump. However, when the proportion of FA is 60% and the content of SF is 0.4%, the slump reaches the minimum value of 130 mm. (2) The peak strength and residual strength increase with the increase of the FA proportion, and the strength gain starts to decrease when the FA proportion exceeds 40%. Moreover, SF only has a small effect on the peak strength when the dosage is 0.8%. (3) The post-peak strain difference decreases with the increase of the FA proportion and increases with the increase of the SF content. The addition of SF can make up for the reduced capacity of RBB to post-peak deformation caused by the addition of FA to a certain extent. (4) The addition of fly ash does not change the brittle failure mode of RBB. Furthermore, after the addition of SF, RBB changes from brittle to ductile failure mode. This study can provide experimental and theoretical basis for improving the bearing capacity of RBB and maintaining the stability of GER. Full article
(This article belongs to the Special Issue Advances in Coal and Water Co-mining)
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18 pages, 6083 KiB  
Article
Study on the Slurry Diffusion Law of Fluidized Filling Gangue in the Caving Goaf of Thick Coal Seam Fully Mechanized Caving Mining
by Liang Li, Qingxiang Huang, Xiao Zuo, Jie Wu, Baoning Wei, Yanpeng He, Weilong Zhang and Jie Zhang
Energies 2022, 15(21), 8164; https://doi.org/10.3390/en15218164 - 1 Nov 2022
Cited by 8 | Viewed by 1710
Abstract
Because of the problem of gangue discharge and surface subsidence during coal mining, the current research on underground filling mainly focuses on the paste filling, solid filling, and grouting filling of the overburden separation layer after scaffolding. We proposed the technology of fluidization [...] Read more.
Because of the problem of gangue discharge and surface subsidence during coal mining, the current research on underground filling mainly focuses on the paste filling, solid filling, and grouting filling of the overburden separation layer after scaffolding. We proposed the technology of fluidization gangue grouting for filling the collapse area based on our previous research. The prediction method of residual space in the collapse area and the diffusion law of gangue fluidization filling slurry are two essential points for successfully implementing the technology and maximizing the use of goaf for gangue backfilling and reducing overburden settlement. To further explore the remaining space distribution law of the collapsed goaf in thick seam fully mechanized top coal caving mining and the effect of coal gangue fluidization filling, the caving goaf of the 3307 fully mechanized top coal caving face in Sangshuping No. 2 coal mine in the Weibei mining area was detected by the transient electromagnetic method. We studied the distribution law of the measured abnormal area in the caving goaf, which reflects the distribution law of the remaining space from one aspect. The coefficient of the remaining space was calculated to be 19.5%. Then, we applied COMSOL simulation software. The diffusion law of coal gangue fluidized slurry in the caving goaf was simulated and analyzed. It shows that the most obvious diffusion direction of the coal gangue slurry is the trend of the gradual expansion of the “cavity pore” multi-type residual space, indicating that with the increase in the diffusion distance, the diffusion resistance gradually increases, and the slurry morphology gradually presents the “claw” form. According to the space theory and fractal dimension theory, the prediction method of the remaining space in the caving goaf is given, and the design basis of the filling drilling parameters is determined. Finally, the field-filling test was carried out. The results show that the high- and low-level fluidized filling in the caving goaf can safely and efficiently handle the gangue in the mine, and the residual space characteristics and slurry diffusion law in the caving goaf are consistent with the above. The research results provide theoretical support for the fluidization filling technology of coal gangue in thick seam fully mechanized top coal caving areas. Full article
(This article belongs to the Special Issue Advances in Coal and Water Co-mining)
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