Study of the Fracture Law of Overlying Strata under Water Based on the Flow-Stress-Damage Model

To accurately detect the development height of the water flowing fractured zone (WFFZ) in the overlying strata of the working face after mining under water and to ensure the safety and reliability of coal mining, the coal seam located under Weishanhu Lake in the Jisan coal mine was used as the exper...

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Bibliographic Details
Published in:Geofluids 2019-01, Vol.2019 (2019), p.1-12
Main Authors: Zuo, Yu-Jun, Cao, Zhiguo, Wen, Jinhao, Tian, Lei, Jiang, Yujing, Jing, Suolin, Wen, Zhijie, Shi, Shaoshuai
Format: Article
Language:English
Subjects:
Analysis
Aquifers
Coal
Coal industry
Coal mines
Coal mining
Computer simulation
Criteria
Damage assessment
Damage detection
Deformation
Engineering
Evolution
Field study
Height
Lakes
Mechanics
Mineral industry
Mines
Mining
Mining accidents & safety
Mining industry
Mohr-Coulomb theory
Occupational safety
Strata
Stress
Surface water
Theory
Water
Water injection
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Summary:To accurately detect the development height of the water flowing fractured zone (WFFZ) in the overlying strata of the working face after mining under water and to ensure the safety and reliability of coal mining, the coal seam located under Weishanhu Lake in the Jisan coal mine was used as the experimental system. A similar laboratory simulation and water injection-based fracturing test system were used with the working face before and after mining activity to calculate, quantitatively detect, and qualitatively analyze the development height of the WFFZ in the overlying strata. Meanwhile, a flow-stress-damage model and its criterion of fracture expansion were established based on the Mohr-Coulomb criterion, and the FLAC 3D software was used to simulate the deformation and failure of the overlying strata and the evolution of WFFZ during the mining process. The results showed that the height ranges of the WFFZ beneath Weishanhu Lake of the Jisan coal mine as established by the above three methods are 30-45 m, 30-48 m, and 30-50 m. In the process of mining, the caving zone and fractured zone are, respectively, subjected to tensile failure and shear failure. The development height of the water flowing through the fractured zone in the overlying strata is basically consistent with the range of the “breaking arch.” The flow-stress-damage model and its criterion of fracture expansion can be applied to the fracture law of overlying strata under water under similar geological conditions.
ISSN:1468-8115
1468-8123
DOI:10.1155/2019/3161852