Abstract
The in-situ stress existing in deep coal and rock will significantly impact the deformation and failure of the surrounding rock, so it is of great significance to study the distribution law of in-situ stress in deep coal and rock. Since the Hawke-Brown envelope cannot accurately predict the deep in-situ stress and other problems, this study, based on the Griffith criterion which considers two limit equilibrium conditions, estimated the in-situ stress range of the deep coal-rock mass and proposed and determined the Griffith envelope. It is related to four parameters. The parameters of the coal-rock mass are determined through experiments, which allows the Griffith envelope of the coal-rock mass to be obtained. The Griffith envelope is then compared with the measured data of the in-situ stress. These results show that the theory in this paper can explain the distribution law of in-situ stress of deep coal and rock mass very well.
Article highlights
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The irrationality of the Hoek Brown curve obtained by the empirical formula increases with the increase of the buried depth.
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Based on the Griffith theory, the Griffith envelope is proposed.
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The theory of this paper not only coherently explains the ratio of horizontal stress to vertical stress in the shallow crust, but that ground stress is also concentrated in a narrow range in the deep region.
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Acknowledgements
The author(s) disclosed receipt of the following financial support for the research, authorship, and/or publication of this article: This work is supported by National Natural Science Foundation of China (No. 52074043, 51804203, 52022014,51704044), General Projects of Basic Science and Frontier Technology Research Projects of Chongqing Science and Technology Planning Project (No. cstc2017jcyjAX0264), Fundamental Research Funds for the Central Universities (106112017CDJXY240001), Open Fund of State Key Laboratory of Water Resource Protection and Utilization in Coal Mining (No. SHJT-16-30.4).
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Wu, F., Zhang, H., Zou, Q. et al. In-situ stress distribution laws of coal and rock in deep mining based on the Griffith criterion. Geomech. Geophys. Geo-energ. Geo-resour. 8, 78 (2022). https://doi.org/10.1007/s40948-022-00395-1
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DOI: https://doi.org/10.1007/s40948-022-00395-1