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1. Calculations of tunnel linings according to the theory of a linear-deformable medium not only increase the reliability of the calculated substantiation of the structure but in many cases also effect a considerable economy. 2. The concrete realization of this theory in the ROBUS-2 program is characterized by a considerable degree of automation of the calculation of a system with unilateral members. 3. Further improvement of the program should provide for its conversion to computers of the ES series, development of a special block for forming the yielding matrix of a frame (instead of the SM-4 program), possibility of increasing the number of joints n, and complete automation of the calculation, including fulfillment of condition (7).

THE ROCK AND THE LINING ARE TREATED AS TIME- DEPENDENT HOMOGENEOUS ISOTROPIC CONTINUUM AND ELASTIC MEDIUM, RESPECTIVELY. THE DISPLACEMENT OF THE PERIPHERY OF THE TUNNEL, DUE TO FIELD AND CONTACT (I.E., BETWEEN THE ROCK AND THE LINING) STRESSES, IS OBTAINED FROM THE CORRESPONDING ELASTIC SOLUTION BY SUBSTITUTING TIME-DEPENDENT PHYSICAL PARAMETERS. THE LINING IS DEALT WITH AS A THIN CURVED PLATE TO DERIVE ITS DEFORMATION. THE CONTACT STRESSES AND THEN THE STRESSES IN THE LINING ARE CALCULATED WITH THE AID OF APPROPRIATE BOUNDARY CONDITIONS. /AMR/