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http://dx.doi.org/10.12989/gae.2020.21.3.301

Study on the distribution law of stress deviator below the floor of a goaf  

Li, Zhaolong (School of Mechanics and Civil Engineering, China University of Mining & Technology (Beijing))
Shan, Renliang (School of Mechanics and Civil Engineering, China University of Mining & Technology (Beijing))
Wang, Chunhe (School of Mechanics and Civil Engineering, China University of Mining & Technology (Beijing))
Yuan, Honghu (School of Mechanics and Civil Engineering, China University of Mining & Technology (Beijing))
Wei, Yonghui (School of Mechanics and Civil Engineering, China University of Mining & Technology (Beijing))
Publication Information
Geomechanics and Engineering / v.21, no.3, 2020 , pp. 301-313 More about this Journal
Abstract
In the process of mining closely spaced coal seams, the problem of roadway arrangement in lower coal seams has long been a concern. By means of mechanical model calculation and numerical simulation postprocessing, the distribution of the stress deviator below the floor of a goaf and the evolution of the stress deviator in the vertical and horizontal directions are studied under the influence of horizontal stress. The results of this theoretical study and numerical simulation show that the stress deviator decreases exponentially with increasing depth from the floor below the coal side. With the increase in the horizontal stress coefficient λ, the stress deviator concentration area shifts. The stress deviator is concentrated within 10 m below the goaf and 15 m laterally from the coal side; thus, the magnitude of the surrounding rock stress deviator should be considered when planning the construction of a roadway in this area.
Keywords
closely spaced coal seams; roadway layout; stress deviator; horizontal stress;
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Times Cited By KSCI : 7  (Citation Analysis)
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