The characteristics of deformation and failure of coal seam floor due to mining in Xinmi coal field in China

Deformation and failure of a “three-weak” (weak roof, thick weak coal, and weak floor) coal seam floor subject to mining are studied in this paper. Firstly, by using a group of strain sensors buried at different floor depths, we measured the relationships of the axial strain to the distance from the...

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Bibliographic Details
Published in:Bulletin of engineering geology and the environment 2014-11, Vol.73 (4), p.1151-1163
Main Authors: Zhu, Shuyun, Jiang, Zhenquan, Zhou, Kaijun, Peng, Guangqing, Yang, Chaowei
Format: Article
Language:English
Subjects:
Boreholes
Coal mines
Coal mining
Deformation
Earth and Environmental Science
Earth Sciences
Foundations
Geoecology/Natural Processes
Geoengineering
Geological engineering
Geology
Geotechnical Engineering & Applied Earth Sciences
Hydraulics
Mines
Mining accidents & safety
Nature Conservation
Occupational safety
Original Paper
Permeability
Pressure distribution
Sensors
Simulation
Strain
Stress concentration
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Summary:Deformation and failure of a “three-weak” (weak roof, thick weak coal, and weak floor) coal seam floor subject to mining are studied in this paper. Firstly, by using a group of strain sensors buried at different floor depths, we measured the relationships of the axial strain to the distance from the advancing face field. The floor depths and stratum positions, and as well as the peak width, which is the distance of the first maximum strain increment to the working face, were drawn. The axial stress and its zone of influence, which is the distance from the face to the borehole along the roadway, and at which there is obvious strain increment difference, were also drawn. Secondly, we established an analytical mechanical model and found the analytical solution of the floor’s supporting pressure distribution ahead of the face. And thirdly, we set up a numerical simulation engineering geological model and simulated stress distribution and deformation characteristics of the floor with complex multi-stratum (11 strata) structure. The results from the three approaches showed that: (1) the failure depth (
ISSN:1435-9529
1435-9537
DOI:10.1007/s10064-014-0612-x