Dynamic Response Study on Shallow Circular Composite-Lining Tunnels

To investigate the dynamic response of shallow buried composite-lining tunnels, series solution of the dynamic stress concentration factor of double linings cylindrical cavities in an half elastic space were presented using the Fourier-Besselh method, as cavities were subjected to incident plane SV waves. The influence of the incident angle and frequency parameter on the dynamic stress concentration factor was discussed, then some conclusions were generated. The maximum dynamic stress concentration factor of the second lining is greater than that of the first lining in double linings tunnels. The dynamic stress concentration factor of the tunnel covered with buffer layers outside changes obviously, when the angle of incident SV waves is 0 and the frequency parameter is 0.25, the dynamic stress concentration factor of linings decreases by 20%. The incident angle and frequency parameter of plane SV waves have a significant influence on the dynamic stress concentration factor, with lager incident angle and frequency parameter, the values and distribution of dynamic stress factor become more complex.