Ground control strategies for longwall top-coal caving panel in extra-thick coal seams with thick-hard roof.

Rui Wang, Wei-Guang Zhang, Hao-Sen Wang, Zai-Jiang Yu, Qiang Zhang

Abstract read

In one paragraph

Article in Scientific reports, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.

0numbers the graph read from it

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0citing papers in PubMed

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1 · What the graph read from it

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The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

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Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

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4 · The record

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5 · Who and what money

Authors and funding

5 authors.

Rui WangKey Laboratory of Xinjiang Coal Resources Green Mining, Xinjiang Key Laboratory of Coal-bearing Resources Exploration and Exploitation, Xinjiang Engineering Research Center of Green Intelligent Coal Mining, Xinjiang Institute of Engineering, Ürümqi, 830023, China. rwang@cumt.edu.cn.

Wei-Guang ZhangKey Laboratory of Xinjiang Coal Resources Green Mining, Xinjiang Key Laboratory of Coal-bearing Resources Exploration and Exploitation, Xinjiang Engineering Research Center of Green Intelligent Coal Mining, Xinjiang Institute of Engineering, Ürümqi, 830023, China.

Hao-Sen WangSchool of Geology and Mining Engineering, Xinjiang University, Ürümqi, 830047, China. wanghaosen@xju.edu.cn.

Zai-Jiang YuKey Laboratory of Xinjiang Coal Resources Green Mining, Xinjiang Key Laboratory of Coal-bearing Resources Exploration and Exploitation, Xinjiang Engineering Research Center of Green Intelligent Coal Mining, Xinjiang Institute of Engineering, Ürümqi, 830023, China.

Qiang ZhangSchool of Mines, China University of Mining and Technology, Xuzhou, 221116, China.

Funding

Internal Project of Key Laboratory of Xinjiang Coal Resources Green Mining, Ministry of Education KLXGY-Z2603Key Research and Development Program of Xinjiang Uygur Autonomous Region 2025B04017-002National Key Research and Development Program Young Scientists Project 2024YFC2910600Science and Technology Plan Project of Kekedala City, the Fourth Division of the Xinjiang Production and Construction Corps 2025ZR005Urumqi City Hongshan Sci-Tech Innovation Elite Talents Youth Top Talents Program B241013004Xinjiang Institute of Engineering Doctoral Start-up Fund 2023XGYBQJ14Xinjiang Uygur Autonomous Region Key R&D Project Task Special-Department and Department Linkage Project 2022B01051-3; 2022B01051Xinjiang Uygur Autonomous Region Tianchi Elite Talent Innovation Leadership Program 2024XGYTCYC03Youth Project of the Natural Science Foundation of Xinjiang Uygur Autonomous Region 2025D01C259

6 · The paper itself

Abstract

Thick-hard roof fracturing presents a significant challenge for disaster prevention in longwall mining. This study investigates the 15,311 south working face and develops a mechanical model to analyze energy release during both initial and cyclic roof fracturing, along with the associated disaster mechanisms. Results indicate that total energy release increases with mining depth, roof thickness, and tensile strength, but decreases with the thickness of the immediate roof. The energy released during initial main roof fracturing is more than twice that of cyclic fracturing. Based on site geology, directional long-drilling fracturing parameters for the thick-hard fine sandstone roof were determined, with a single-point water injection of 20 m³ and a fracturing point spacing of 15 m. Following the "energy mitigation-structural weakening-stress regulation" principle, a "fixed-length drilling-hydraulic fracturing" model was implemented. On-site monitoring showed maximum movements in the tailgate of 236 mm in coal pillar gangs, 135 mm in solid coal, and 287 mm in roof-floor convergence. The initial pressure step decreased from 45 m to 18 m, and average cyclic pressure steps were reduced by 35% compared with a non-fractured face. The proposed scheme effectively facilitated safe and efficient mining under a thick-hard roof.

Indexed as

Directional hydraulic fractureExtra-thick coal seamsFully mechanized top-coal caving miningLarge-section mining spaceThick-hard roof

Identifiers

PMID41845013

DOI10.1038/s41598-026-44269-y

PMCPMC13133104

What OpenQuestion holds

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LicenceCC BY-NC-ND

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Registered trials

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Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.