Abstract

SONG, Z-P. et al. Experimental investigation and numerical simulation of surrounding rock creep for deep mining tunnels. J. S. Afr. Inst. Min. Metall. [online]. 2016, vol.116, n.12, pp.1181-1188. ISSN 2411-9717.  http://dx.doi.org/10.17159/2411-9717/2016/v116n12a13.

In deep excavations under conditions of high ground stress, even hard rock undergoes creep and other time-dependent effects that may result in instability. This study involves an analysis of the typical damage to the surrounding rock in the deep tunnels of the Jinchuan nickel mine in China. In order to understand the creep mechanism, triaxial creep laboratory tests were conducted under high stress. The creep characteristic curves and the Nishihara model parameters of typical rock were obtained from these tests. The numerical simulations, with which the creep model is developed, were performed using Flac3D. The creep model parameters were back-analysed on the basis of field monitoring data. Finally, appropriate support schemes for deep tunnels are suggested. The creep deformation of rock increases with time and axial load. At the same load level, the creep deformation of unloading is greater than that of loading. The simulated deformations of the surrounding rock are coincident with those from in situ monitoring, indicating the applicability of the presented rock creep model in situations of high ground stress. The results constitute a reference for support design in deep mining tunnels. rock creep, high ground stress, deformation, modelling, numerical simulation.

Keywords : rock creep; high ground stress; deformation; modelling; numerical simulation.

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