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  Study on the Mechanism of Seismic Technology of Deep Soft Rock Circular Tunnels Subjected to Incident Plane P Waves

  Tunnel damage generally occurred in soft surrounding fracture zone and the study on the seismic technology of soft rock tunnel was important and essential which was invested by WANG(2009). Currently, grouting reinforcement is always used in weak rock tunnel as seismic measure. Since Pao and Mao (1973) firstly studied the dynamic stress concentration of circular lined cavity in elastic full space based on wave expansion methods, with large circular surface assumption, the analytical solutions of circular cavity incident to P and SV waves in half space were provided by Lee, and the dynamic stress concentration factor of the circular lining cavity was derived by JI (2005). The dynamic stress concentration of double linings cavity in infinite space incident to SH waves were analyzed by Li (2010). In actual engineering, the NATM method is generally used in soft rock tunnel construction, for keeping the surrounding rock stable, firstly the initial lining is done, and then the secondary lining is set for safety. Therefore , on the basis of previous researches, the dynamic response of deep soft rock cylindrical composite-lining tunnels with grouting reinforcement subjected to incident plane P waves were studied by wave function expansion method. Then the factors affecting the dynamic stress concentration of the lining structures, such as the elastic modulus and thickness of the grouting reinforcement zone were discussed.

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