Tunnel structure with foam concrete primary lining as damping layer

Abstract

The invention discloses a tunnel structure with a foam concrete primary lining as a damping layer. The tunnel structure comprises the primary lining and a secondary lining layer. An anchor rod is disposed on the primary lining, and the primary lining is jetted by the foam concrete and obtained. The primary lining possesses the damping effect; the traditional primary lining and a damping layer are combined together, which can not only meet the requirements of initial support, but also achieve the functions of the damping layer. The foam concrete possesses good energy absorption and damping performance, thus the energy of seismic waves transmitted to the secondary lining layer and other structures can be effectively reduced; the damage of the seismic waves to the whole structure of the tunnel is reduced; the anti-seismic, anti-impacting , anti-cracking and durability performance of the primary lining are effectively improved; the ductility of the primary lining is improved and the brittleness of the primary lining is reduced; the response time of the tunnel to earthquake is extended; the re-distribution of the ground stress is effectively promoted and the seismic energy is absorbed, and the major earthquake force is resisted, thereby reducing the damage of the earthquake force to the tunnel structure; the construction process and project cost are effectively reduced, and the overall economic and social benefits are better.

Description

technical field [0001] The invention relates to a tunnel structure, in particular to a tunnel structure in which the foam concrete primary lining doubles as a shock-absorbing layer. Background technique [0002] A tunnel is an underground building (structure) buried in the rock and soil layer. When an earthquake occurs, the underground structure will move together with the surrounding rock. It is generally believed that the vibration acceleration of the surrounding rock is less than the acceleration of the ground structure, and the surrounding rock has sufficient rigidity and strength to keep the tunnel structure from deformation or damage, so the tunnel is considered to have good shock-absorbing performance. However, the 1995 Great Hanshin Earthquake in Japan caused serious damage to some tunnels; the 1999 Taiwan Chiji Earthquake caused serious damage to about 25% of the tunnels within 25 km; the 2008 Wenchuan Earthquake caused serious damage to most of the tunnels in the d...

AI Technical Summary

Problems solved by technology

However, effective shock-absorbing materials and shock-absorbing measures have not been proposed in the seismic codes related to underground structures in my country.

Images