Study on Foam Concrete Damping Measure for Crossing High-Speed Railway tunnel

摘要

Numerical calculations for the damping effect of foam concrete cushioning layer in crossing high-speed railway tunnel were carried out, based on the fluctuation theory using the Newmark implicit integration algorithm and he Lysmer viscous boundary condition. Then the measure's damping effects were evaluated by indicators such as the displacement, acceleration and stress response of the lining structure. Results indicated that foam concrete cushioning layer had good damping effects on the lining structure and showed significant damping effects within the thickness of 5 to 10 cm. In addition, closer to the crossing point, better the damping effects were. These results could make valuable reference for the anti-vibration design in crossing high-speed railway tunnel.