Novel Approach to Ground Control for Roadways Beneath Gob in Closely Spaced Coal Seams: A Case Study
Source abstract
Abstract
The stability of retained roadways in closely spaced coal seams beneath a goaf is strongly affected by complex stress redistribution and the deterioration of roof structures under downward mining conditions. To address this issue, a combined approach involving theoretical analysis, numerical simulation, and field monitoring was adopted to investigate the deformation characteristics and stability control of gob-side retained roadways in short-distance coal seam groups. The movement characteristics of the roof and the deformation law of surrounding rock of the retained roadway under downward mining were revealed. An embedded short-arm beam structural model for a roof cutting retained roadway was established, and a calculation method for determining the required support resistance of the retained roadway was proposed. Based on this model, design criteria for the passive support system of the retained roadway were developed. A surrounding rock control technology with hollow grouting anchor cable support and low-disturbance directional roof cutting as the core was proposed, and the support resistance of a one-beam–four-column support system was determined to effectively limit roof subsidence. Field application results show that the surrounding rock displacement was controlled within 350 mm, and the roadway section shrinkage rate was maintained at 16.4%, indicating good stability of the retained roadway and satisfying the requirements of ventilation and transportation. This study provides a mechanical basis and practical guidance for stability control and support design of roof cutting retained roadways in closely spaced coal seams beneath goaf.
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Research context
OpenAlex topics: Tailings Management and Properties · Geomechanics and Mining Engineering · Rock Mechanics and Modeling
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
State Key Laboratory for Tunnel Engineering, China University of Mining & Technology (Beijing), Beijing 100083, China
School of Mechanics and Civil Engineering, China University of Mining & Technology (Beijing), Beijing 100083, China
School of Resource and Environmental Engineering, Shandong University of Technology, Zibo 255000, China
Funding
Scientific Research Innovation Capability Support Project for Young Faculty · Fundamental and Interdisciplinary Disciplines Breakthrough Plan of the Ministry of Education of China · National Natural Science Foundation of China · Guizhou Province Science and Technology Planning Project
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Show source-provided references
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