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Fluid Transport in Fractured Rocks: Safe, Green and Efficient Development of Coal

A special issue of Applied Sciences (ISSN 2076-3417). This special issue belongs to the section "Earth Sciences".

Deadline for manuscript submissions: 20 February 2026 | Viewed by 291

Special Issue Editor

School of Mines, China University of Mining and Technology, Xuzhou, China
Interests: coal oil and gas mining

Special Issue Information

Dear Colleagues,

This Special Issue aims to advance the understanding of fluid transport mechanisms in fractured coal and rock formations, with a focus on innovative solutions for safe, green, and efficient coal and associated resource development. Fractured media, prevalent in coal seams and geological strata, exhibit complex fluid flow behaviors (e.g., groundwater, methane, and hazardous gases) that directly impact mining safety, resource extraction efficiency, and environmental sustainability.

Key Research Areas:

  1. Mechanisms of groundwater and gas (e.g., methane, hydrogen sulfide) migration in fractured coal and rocks under varying stress, temperature, and chemical conditions.
  2. Surrounding rock control in water-rich roadways, and long-term stability of underground structures subjected to acidic/alkaline groundwater corrosion.
  3. Efficient coalbed methane (CBM) drainage techniques, such as hydraulic fracturing, borehole optimization, and enhanced gas recovery (EGR) methods.
  4. Mechanisms of bed separation water hazards (e.g., water accumulation in fractured strata) and innovative prevention strategies (e.g., grouting, drainage systems).
  5. Green mining practices that minimize water and soil contamination, including closed-loop fluid management and eco-friendly fracturing fluids.

Any original, unpublished work is welcome. If you have an interest in this topic, please let us know. I look forward to receiving your submissions.

Dr. Shun Liang
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 250 words) can be sent to the Editorial Office for assessment.

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. Applied Sciences 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 2400 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

  • groundwater migration
  • gas transport
  • fractured coal/rock
  • coalbed methane drainage
  • hydraulic fracturing
  • green mining

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Published Papers (1 paper)

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Research

22 pages, 6651 KB  
Article
Influence of Moisture on Mechanical Properties and Energy Dissipation Characteristics of Coal–Rock Combined Body
by Yukuan Fan, Qiang Xu, Ze Xia and Chuangkai Zheng
Appl. Sci. 2025, 15(23), 12672; https://doi.org/10.3390/app152312672 - 29 Nov 2025
Viewed by 163
Abstract
Focusing on underground reservoir coal pillar dams subjected to long-term water immersion, this study employed a self-developed non-destructive water saturation apparatus to prepare monolithic and composite coal–rock specimens with varying moisture conditions. Through uniaxial compression tests combined with acoustic emission (AE) monitoring technology, [...] Read more.
Focusing on underground reservoir coal pillar dams subjected to long-term water immersion, this study employed a self-developed non-destructive water saturation apparatus to prepare monolithic and composite coal–rock specimens with varying moisture conditions. Through uniaxial compression tests combined with acoustic emission (AE) monitoring technology, the mechanical failure characteristics and energy dissipation behavior of these specimens were systematically investigated. The results indicated that both the UCS and elastic modulus (E) of the single-rock specimens decreased with increasing water content. Conversely, the mechanical properties of the composite specimens were significantly influenced by the properties and water saturation state of the rock components within the composite. When the rocks within the composite specimens share identical moisture conditions, higher rock strength correlates with greater specimen strength and strain. Under identical lithological conditions, the peak stress (σc), peak strain (εc), and elastic modulus (E) of the composite specimens decreased with increasing rock moisture content, which exhibited reductions of 45%, 21.8%, and 13.5% in σc, εc, and E, respectively, under saturated conditions. Acoustic emission (AE) monitoring data revealed that AE events in coal–rock composite specimens under uniaxial loading exhibited distinct spatial distribution patterns. Furthermore, as the rock moisture content increased, the ultimate failure mode of the composite specimen progressively shifted from shear failure within the coal matrix toward tensile failure of the composite as a whole. An analysis of the energy characteristics of coal–rock composite specimens under uniaxial compression revealed that rock properties and moisture content significantly influence energy absorption and conversion during loading. With increasing rock moisture content, the total energy, elastic strain energy, and dissipated energy at the peak load exhibited decreasing trends, reflecting the weakening effect of water on energy dissipation in coal–rock composites. This study systematically investigated the instability mechanisms of coal–rock composites from three perspectives—mechanical properties, failure modes, and energy dissipation—thereby providing valuable insights for evaluating the long-term stability of underground reservoir coal pillar dams subjected to prolonged water immersion. Full article
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