Abstract: If stress concentration factor expression for rectangular drift opening is known, it can be of great help in the design and support of mine horizontal rectangular drift.Dimensional analysis was first made and parameters relating to rectangular drift were made dimensionless.By means of functions of complex variable, the functional relations between stress concentration coefficient K_t and ratio coefficients k, s, n were deduced and compared with numerical simulation results, which achieved satisfactory results.

Key words: Stress concentration coefficient, Rectangular drift, Elastic analysis, Functions of complex variable