You can try to use Hoek Evert methodology. The steps and way of calculation for circular tunnel openings is explained in book Practical Rock Engineering on web site rocscience.com at Hoek corner.
Two different approaches to predict ground deformation have been developed by Panet and Chern, respectively, and please have a close look into their publications. Hope this helps.
Panet, M. (1993). Understanding deformations in tunnels. In: Hudson, J.A., Brown, E.T., Fairhurst, C., Hoek, E. (Eds.), Comprehensive Rock Engineering, Vol. 1. Pergamon, London, 663–690.
Chern, J.C., Shiao, F.Y., Yu, C.W. (1998). An empirical safety criterion for tunnel construction. Proceedings of the Regional Symposium on Sedimentary Rock Engineering, Taipei, Taiwan. 222–227.
i suggest you to use numerical methods such as FDM to draw GRC. FLAC 2D and 3D are numerical modelling programs which able to draw GRC for whole of tunnel periphery. you can find more information in Manual of Itasca FLAC
I suggest using numerical modeling of rockmass around an excavation supported by time-dependent field measument of deformations around the excavation to develop a reasonable GRC. I suggest making such assessment at mutiple points on a mining property to come up with an aaverage GRC for supports design and assessment.