SPATIAL INTERACTION OF SEISMIC WAVES WITH LININGS OF CIRCULAR TUNNELS Lti ROCK MASS

Non-stationary interaction between a circular cylindrical shell and a seismic wave incoming at an arbitrary angle to a shell axis is considered. The boundary conditions at the contact of a lining with a rock mass are assuii-ed as a rigid contact and a perfect slip. The problem is solved with the help of Laplace time and longitudinal coordinate transformations as well as Fourier finite angle transforniation. The solution is given for a plane longitu-dinal elastic wave of step-like shape. Tii,,e inversion is performed numeric-ally and analitycally. Numerical calculations are made on a computer. The effect of an incoming wave inclination and the kind of boundary conditicns on the magnitude of internal forces occurring in a lining is investigated