Abstract
The deep surrounding rock is in a three-directional stress state before mining. The process of roadway excavation is the process of confining pressure unloading due to the engineering needs. Therefore, the confining pressure effect plays an indispensable and important role in deep engineering. Based on the above engineering background, the current research status and development trend on the confining pressure effect are introduced. Besides, combined with the results of rock mechanics tests, the basic mechanical parameters, strength and deformation evolution law, energy evolution law, damage evolution law, and failure characteristics of coal and rock under different confining pressures are revealed. Meanwhile, four new insights are proposed: (1) It is urgent to establish the detailed evaluation index system to quantitatively and qualitatively characterize the brittleness and ductility of rock under the confining pressure effect; (2) It is necessary to strengthen the research on the time-dependent deformation mechanism and the construction of time-dependent strength evolution model of coal and rock, so that the localization of time effect is gradually transferred from rheological mechanics to other mechanical fields; (3) It is valuable to strengthen the research on the mechanical properties of coal and rock under the confining pressure effect from the microscopic perspective; (4) It is meaningful to strengthen the creep mechanical experimental research on coal and rock with the new stress path of “three stages” loading, which includes initial high in-situ stress state reduction, constant axial pressure with unloading confining pressure, and constant confining pressure with loading axial pressure corresponding to three stages of the stress variation characteristics of the surrounding rock around the roadway of deep mines: before excavation, being excavated, and after excavation.
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This study was supported by the National Natural Science Foundation of China (grant nos. 51974319, 52034009), and the Yue Qi Distinguished Scholar Project (grant no. 2020JCB01).
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Song, Z., Zhang, J. The effect of confining pressure on mechanical properties in coal and rock: review and new insights. Arab J Geosci 14, 2564 (2021). https://doi.org/10.1007/s12517-021-08553-7
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DOI: https://doi.org/10.1007/s12517-021-08553-7